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Jörg Mutterlose - One of the best experts on this subject based on the ideXlab platform.
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strontium isotope stratigraphy of the early cretaceous valanginian Barremian implications for boreal tethys correlation and paleoclimate
Cretaceous Research, 2014Co-Authors: Jörg Mutterlose, Stéphane Bodin, Laurenz FähnrichAbstract:Abstract The interpretation of past oceanographic events on a supra-regional scale requires precisely dated and well correlated biostratigraphic schemes. Only synchronous events can be interpreted in a global context. Events of local or regional character have therefore to be accurately correlated with time-equivalent shifts in other areas in order to be interpreted in a wider context. One of the problems of inter-basin correlation based on biostratigraphy lies in floral and faunal provincialism of the relevant index fossils. In order to overcome such limitations, chemostratigraphy can be used as a stratigraphic tool independent of biostratigraphy. This study presents 87 Sr/ 86 Sr-isotope data for the Lower Cretaceous (Valanginian to Barremian) based on previously published findings from Speeton (northeast England) and the Vocontian Basin (southeast France). These belemnite-based 87 Sr/ 86 Sr-isotope data allow a correlation of the Lower Cretaceous sequences of the Boreal Realm and the Tethys independent of biostratigraphy. This chemostratigraphic approach may help to overcome the biostratigraphic problems which have been discussed for more than 40 years. The two different 87 Sr/ 86 Sr-isotope curves modeled for the Boreal Realm and the Tethys show two offsets, asking for the following adjustments of the current correlation scheme. In the Boreal Realm, the base of the lower Hauterivian, currently defined by the first occurrence of the ammonite Endemoceras amblygonium , should be shifted into the Endemoceras amblygonium zone. The base of the upper Barremian, in the Boreal Realm defined by the first occurrence of the ammonite Paracrioceras elegans , correlates with the uppermost part of the Tethyan Kotetishvilla compressissima zone in the lower Barremian. To adjust for this mismatch a shift of the lower/upper Barremian boundary is necessary either in the Boreal Realm or in the Tethys. The combined 87 Sr/ 86 Sr and δ 18 O Bel isotope datasets suggest a synchronous negative δ 18 O Bel shift for the middle Barremian. This shift, seen both in the Boreal and in the Tethys, indicates a major European wide phase of high humidity and increased run-off.
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Strontium-isotope stratigraphy of the Early Cretaceous (Valanginian–Barremian): Implications for Boreal–Tethys correlation and paleoclimate
Cretaceous Research, 2014Co-Authors: Jörg Mutterlose, Stéphane Bodin, Laurenz FähnrichAbstract:Abstract The interpretation of past oceanographic events on a supra-regional scale requires precisely dated and well correlated biostratigraphic schemes. Only synchronous events can be interpreted in a global context. Events of local or regional character have therefore to be accurately correlated with time-equivalent shifts in other areas in order to be interpreted in a wider context. One of the problems of inter-basin correlation based on biostratigraphy lies in floral and faunal provincialism of the relevant index fossils. In order to overcome such limitations, chemostratigraphy can be used as a stratigraphic tool independent of biostratigraphy. This study presents 87 Sr/ 86 Sr-isotope data for the Lower Cretaceous (Valanginian to Barremian) based on previously published findings from Speeton (northeast England) and the Vocontian Basin (southeast France). These belemnite-based 87 Sr/ 86 Sr-isotope data allow a correlation of the Lower Cretaceous sequences of the Boreal Realm and the Tethys independent of biostratigraphy. This chemostratigraphic approach may help to overcome the biostratigraphic problems which have been discussed for more than 40 years. The two different 87 Sr/ 86 Sr-isotope curves modeled for the Boreal Realm and the Tethys show two offsets, asking for the following adjustments of the current correlation scheme. In the Boreal Realm, the base of the lower Hauterivian, currently defined by the first occurrence of the ammonite Endemoceras amblygonium , should be shifted into the Endemoceras amblygonium zone. The base of the upper Barremian, in the Boreal Realm defined by the first occurrence of the ammonite Paracrioceras elegans , correlates with the uppermost part of the Tethyan Kotetishvilla compressissima zone in the lower Barremian. To adjust for this mismatch a shift of the lower/upper Barremian boundary is necessary either in the Boreal Realm or in the Tethys. The combined 87 Sr/ 86 Sr and δ 18 O Bel isotope datasets suggest a synchronous negative δ 18 O Bel shift for the middle Barremian. This shift, seen both in the Boreal and in the Tethys, indicates a major European wide phase of high humidity and increased run-off.
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palaeoceanography of lower cretaceous Barremian lower aptian black shales from northwest germany evidenced by calcareous nannofossils and geochemistry
Cretaceous Research, 2013Co-Authors: Sebastian Pauly, Jörg Mutterlose, David WrayAbstract:Abstract During the Barremian–Early Aptian, the Lower Saxony Basin (LSB) of northwest Germany was covered by a shallow epicontinental sea where restricted conditions resulted in the formation of black shales. This study focuses on a 103-m-thick succession of Lower Barremian–Lower Aptian dark claystones and black shales exposed in a temporary road cut in northwest Germany (A39). Calcareous nannofossils and the δ13Corg record have been used to determine the timing of black shale deposition (Hauptblatterton, Blatterton, Fischschiefer events). Redox-sensitive trace elements indicate anoxic conditions with free H2S causing the formation of black shales and dysoxic conditions during deposition of the dark claystones. The palaeoecological reconstructions based on calcareous nannofossils suggest that during the Lower Barremian Hauptblatterton event a stratification of water masses existed, caused by high surface water temperatures and reduced terrigenous run-off. During the deposition of the Upper Barremian clay-Blatterton alternation warm surface water prevailed, accompanied by meso-eutrophic surface water conditions. The formation of the Barremian black shales was mainly caused by restricted conditions related to the palaeogeography and palaeoceanography of the LSB. Global processes associated with the Oceanic Anoxic Event 1a most likely induced the deposition of the Lower Aptian Fischschiefer. High weathering rates, high primary production, and restricted conditions in the LSB led to increased burial of organic matter and thereby to the formation of the Fischschiefer.
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Palaeoceanography of Lower Cretaceous (Barremian–Lower Aptian) black shales from northwest Germany evidenced by calcareous nannofossils and geochemistry
Cretaceous Research, 2013Co-Authors: Sebastian Pauly, Jörg Mutterlose, David WrayAbstract:Abstract During the Barremian–Early Aptian, the Lower Saxony Basin (LSB) of northwest Germany was covered by a shallow epicontinental sea where restricted conditions resulted in the formation of black shales. This study focuses on a 103-m-thick succession of Lower Barremian–Lower Aptian dark claystones and black shales exposed in a temporary road cut in northwest Germany (A39). Calcareous nannofossils and the δ13Corg record have been used to determine the timing of black shale deposition (Hauptblatterton, Blatterton, Fischschiefer events). Redox-sensitive trace elements indicate anoxic conditions with free H2S causing the formation of black shales and dysoxic conditions during deposition of the dark claystones. The palaeoecological reconstructions based on calcareous nannofossils suggest that during the Lower Barremian Hauptblatterton event a stratification of water masses existed, caused by high surface water temperatures and reduced terrigenous run-off. During the deposition of the Upper Barremian clay-Blatterton alternation warm surface water prevailed, accompanied by meso-eutrophic surface water conditions. The formation of the Barremian black shales was mainly caused by restricted conditions related to the palaeogeography and palaeoceanography of the LSB. Global processes associated with the Oceanic Anoxic Event 1a most likely induced the deposition of the Lower Aptian Fischschiefer. High weathering rates, high primary production, and restricted conditions in the LSB led to increased burial of organic matter and thereby to the formation of the Fischschiefer.
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The onset of anoxic conditions in the early Barremian of the Boreal Realm evidenced by benthic foraminifera
Revue de Micropaléontologie, 2012Co-Authors: Christine Löb, Jörg MutterloseAbstract:Abstract The Frielingen clay pit, situated approximately 20 km northwest of Hannover (northern Germany) exposes sediments of Early Cretaceous age (Hauterivian, Barremian). Rhythmic alternations of dark mudstones and pale marls of late Hauterivian age (Simbirskites discofalcatus ammonite Zone) dominate the lithology. These bedding rhythms are overlain by laminated dark shales and lighter mudstones, assigned to the lowermost Barremian (Praeoxyteuthis pugio belemnite Zone). For this study 27 samples covering the Hauterivian/Barremian boundary interval were investigated with respect to their CaCO3 and total organic contents (TOC), stable isotope composition ( δ 13 C o r g , δ 13 C C a C O 3 , δ 18 O C a C O 3 ) and their micropalaeontology (foraminifera). The samples were analysed in order to better understand the onset of the Barremian anoxic conditions in the Boreal Realm. The data obtained show that shifts of the environmental parameters are reflected by the mudstone-marl alternation. The dark mudstones reflect cooler surface water temperatures and a lower oxygen content, while the pale marls were deposited under warm surface water conditions. These bedding rhythms are thought to be the result of climatic variations in the Milankovitch Band (10Ka–1Ma). This study further documents that the Hauterivian/Barremian transition is characterised by a deterioration of the living conditions for benthic organisms. This is indicated by the decline of several foraminiferal genera, by decreasing generic richness and by a coeval increase in the abundances of specific taxa. The TOC content and the isotopic composition of the organic carbon support these findings. A morphogroup analysis of the benthic foraminifera indicates changes of the habitats from mainly infaunal in the late Hauterivian to more epifaunal in the early Barremian. Due to this dramatic decline of infaunal forms in the laminated, TOC-rich mudstones of the lowermost Barremian, suboxic to anoxic conditions are postulated for these sediments. The bottom water must, however, have contained some oxygen at least, as is indicated by a few epifaunal genera that became very abundant (e.g. Ammodiscus). A major regression around the Hauterivian/Barremian boundary caused a closing of the seaway to the Tethys, resulting in a significantly reduced water exchange and the establishment of anoxic conditions.
Jean-pierre Masse - One of the best experts on this subject based on the ideXlab platform.
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platform to basin anatomy of a Barremian aptian tethyan carbonate system new insights into the regional to global factors controlling the stratigraphic architecture of the urgonian provence platform southeast france
Cretaceous Research, 2018Co-Authors: Anthony J.-b. Tendil, Jean-pierre Masse, Camille Frau, Cyprien Lanteaume, Philippe Leonide, Francois Fournier, Jean Borgomano, Gerard Massonnat, Jeanpaul RolandoAbstract:Abstract The recognition of regional ammonite bio-events spanning the late Barremian–early Aptian interval in Provence invalidates previous chronostratigraphic models of the Urgonian carbonate platform. Based on high-resolution correlations across the Provence platform and the Vocontian Basin, this study provides a comprehensive revision of the temporal and spatial evolution of this sedimentary system through the definition of seven depositional sequences. Close to the early–late Barremian transition, the South Provence domain was marked by the inception of rudistid, Agriopleura-dominated, carbonates, while further to the North, the expansion of the latter biota was delayed, presumably due to greater subsidence rates driven by extensive E–W-trending basement faults. Northward installation of a rudist-rich succession in the North Provence region – including, from oldest to youngest, the Agriopleura, requieniid–monopleurid and caprinid episodes – strictly spans the late Barremian. Intermittent shedding of platform-derived material influenced the basinal series in the pre-Vocontian margin at that time. Structural inheritance and active contribution of syn-sedimentary tectonics into the stratigraphic architecture are suggested through similar orientation of depositional environment belts along with important thickness and facies variations within the North Provence area. Large-scale deformation due to the progressive rotation of the Iberian plate is likely to have direct implications into the Provence domain. Concomitant rudistid production crises, replaced by mass occurrence of Palorbitolina deposits, are documented across the peri-Vocontian Urgonian platforms. The final demise of the Urgonian-type rudistid regime, previously linked to the onset of the Oceanic Anoxic Event 1a, rather correlates to the intermittently anoxic Taxy episode. These results call for a reconsideration of the chronology of events controlling the development of Urgonian shallow-water carbonate systems through the Barremian.
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Late Barremian–early Aptian ammonite bioevents from the Urgonian-type series of Provence, southeast France: Regional stratigraphic correlations and implications for dating the peri-Vocontian carbonate platforms
Cretaceous Research, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Anthony J.-b. Tendil, Antoine Pictet, Cyprien Lanteaume, Luc Bulot, Jean Borgomano, Tim Luber, Jonathan Redfern, Philippe LeonideAbstract:This work provides a new ammonite age-calibration of the rudistid limestones of the Urgonian-type Provence carbonate platform (Southeast France) based on sampling along three ~200 km-long platform-to-basin transects and re-examination of historical collections. Ammonite key findings indicate that the first rudistid platform stage (including the Agriopleura and requieniidemonopleurid beds) develops and spreads northward through the Toxancyloceras vandenheckii-Gerhardtia sartousiana zones interval (lower upper Barremian). This stage is interrupted by the tectonically-induced deepening of the southern Provence domain during the Imerites giraudi Zone while the northern regions records the massive deposition of Palorbitolina-Heteraster beds. Recovery of the rudistid carbonate system is illustrated by the development of caprinid-bearing rudistid limestones in the North Provence domain through the Martelites sarasini Subzone (lower Martelites sarasini Zone, uppermost Barremian), which shows a bidirectional progradation toward the South Provence and Vocontian basins. The caprinid-bearing limestones terminate at a shortterm exposure and are overlain by cherty-oobioclastic deposits spanning the Pseudocrioceras waagenoides Subzone (upper M. sarasini Zone) to the lower Deshayesites forbesi Zone. A regional-wide flooding of the study area is illustrated by the abrupt change to a marl-dominated regime occurring in the upper D. forbesi Zone. Compared to the previous datings, the Barremian/Aptian boundary should be relocated in the lower part of the post-caprinid, cherty-oobioclastic deposits although its precise level cannot be fixed due to the lack of a continuous ammonite record. Ammonite age-calibration of the surrounding Urgonian rudistid platform series is discussed and gives evidence of a comparable twofold demise of the peri-Vocontian rudistid biota during the uppermost Barremian. Accordingly, the link between the final demise of the peri-Vocontian rudistid biota and the onset and/or culmination of the mid-early Aptian Oceanic Anoxic Event (OAE) 1a should be reconsidered.
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late Barremian early aptian ammonite bioevents from the urgonian type series of provence southeast france regional stratigraphic correlations and implications for dating the peri vocontian carbonate platforms
Cretaceous Research, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Luc G. Bulot, Anthony J.-b. Tendil, Antoine Pictet, Cyprien Lanteaume, Jean Borgomano, Tim Luber, Jonathan Redfern, Philippe LeonideAbstract:Abstract This work provides a new ammonite age-calibration of the rudistid limestones of the Urgonian-type Provence carbonate platform (Southeast France) based on sampling along three ∼200 km-long platform-to-basin transects and re-examination of historical collections. Ammonite key findings indicate that the first rudistid platform stage (including the Agriopleura and requieniid–monopleurid beds) develops and spreads northward through the Toxancyloceras vandenheckii – Gerhardtia sartousiana zones interval (lower upper Barremian). This stage is interrupted by the tectonically-induced deepening of the southern Provence domain during the Imerites giraudi Zone while the northern regions records the massive deposition of Palorbitolina – Heteraster beds. Recovery of the rudistid carbonate system is illustrated by the development of caprinid-bearing rudistid limestones in the North Provence domain through the Martelites sarasini Subzone (lower Martelites sarasini Zone, uppermost Barremian), which shows a bidirectional progradation toward the South Provence and Vocontian basins. The caprinid-bearing limestones terminate at a short-term exposure and are overlain by cherty–oobioclastic deposits spanning the Pseudocrioceras waagenoides Subzone (upper M. sarasini Zone) to the lower Deshayesites forbesi Zone. A regional-wide flooding of the study area is illustrated by the abrupt change to a marl-dominated regime occurring in the upper D. forbesi Zone. Compared to the previous datings, the Barremian/Aptian boundary should be relocated in the lower part of the post-caprinid, cherty–oobioclastic deposits although its precise level cannot be fixed due to the lack of a continuous ammonite record. Ammonite age-calibration of the surrounding Urgonian rudistid platform series is discussed and gives evidence of a comparable twofold demise of the peri-Vocontian rudistid biota during the uppermost Barremian. Accordingly, the link between the final demise of the peri-Vocontian rudistid biota and the onset and/or culmination of the mid-early Aptian Oceanic Anoxic Event (OAE) 1a should be reconsidered.
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The Aptian GSSP candidate at Gorgo a Cerbara (Central Italy): an alternative interpretation of the bio-, litho- and chemostratigraphic markers
Newsletters on Stratigraphy, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Anthony J.-b. Tendil, Luc Bulot, Gérard Delanoy, Josep Moreno-bedmar, Cyprien LanteaumeAbstract:The Maiolica-type Gorgo a Cerbara section (Central Italy) was proposed as GSSP candidate for defining the base of the Aptian Stage with the base of the reverse magnetochron CM0r as the primary datum. Comparison with well-documented, ammonite-bearing successions of southeast France shows that the bio-, litho- and chemostratigraphic events recorded in Italy, below, at, and above this magnetochron fall within the Martelites sarasini ammonite Zone. Since there is an agreement that the M. sarasini Zone is the last ammonite zone of the Barremian, the use of the base of magnetozone CM0r as a datum to define the Barremian/Aptian boundary is questioned.
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Is Strontium-isotope stratigraphy a reliable tool for dating shallow-marine platform carbonates at the Barremian-Aptian transition? Review of western Tethyan case studies
Carnets de Géologie, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Mukerrem Fenerci-masse, Anthony J.-b. Tendil, Antoine Pictet, Cyprien LanteaumeAbstract:Strontium-isotope measurements on Lower Cretaceous marine rocks derive from belemnite material sampled in ammonite-constrained basinal successions. A group of values with a narrow range across the Barremian/Aptian boundary does not allow the separation of the uppermost Barremian (Martelites sarasini ammonite zone) from the lower Aptian pro parte (Deshayesites oglanlensis-D. forbesi ammonite zones). Growing numbers of studies applied Sr-Isotope Stratigraphy (SIS) on Barremian-Aptian shallow-marine sequences (Urgonian facies) in order to solve controversial results obtained by using different shallow-water biological time markers. Based on re-examination of case studies, we conclude that Sr-isotope values can neither be used to prove nor to disprove the location of the putative Barremian/Aptian boundary based on biostratigraphy. Pending more data available, SIS should be used with caution for dating ammonite-free carbonate sediments in the corresponding time interval.
Camille Frau - One of the best experts on this subject based on the ideXlab platform.
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platform to basin anatomy of a Barremian aptian tethyan carbonate system new insights into the regional to global factors controlling the stratigraphic architecture of the urgonian provence platform southeast france
Cretaceous Research, 2018Co-Authors: Anthony J.-b. Tendil, Jean-pierre Masse, Camille Frau, Cyprien Lanteaume, Philippe Leonide, Francois Fournier, Jean Borgomano, Gerard Massonnat, Jeanpaul RolandoAbstract:Abstract The recognition of regional ammonite bio-events spanning the late Barremian–early Aptian interval in Provence invalidates previous chronostratigraphic models of the Urgonian carbonate platform. Based on high-resolution correlations across the Provence platform and the Vocontian Basin, this study provides a comprehensive revision of the temporal and spatial evolution of this sedimentary system through the definition of seven depositional sequences. Close to the early–late Barremian transition, the South Provence domain was marked by the inception of rudistid, Agriopleura-dominated, carbonates, while further to the North, the expansion of the latter biota was delayed, presumably due to greater subsidence rates driven by extensive E–W-trending basement faults. Northward installation of a rudist-rich succession in the North Provence region – including, from oldest to youngest, the Agriopleura, requieniid–monopleurid and caprinid episodes – strictly spans the late Barremian. Intermittent shedding of platform-derived material influenced the basinal series in the pre-Vocontian margin at that time. Structural inheritance and active contribution of syn-sedimentary tectonics into the stratigraphic architecture are suggested through similar orientation of depositional environment belts along with important thickness and facies variations within the North Provence area. Large-scale deformation due to the progressive rotation of the Iberian plate is likely to have direct implications into the Provence domain. Concomitant rudistid production crises, replaced by mass occurrence of Palorbitolina deposits, are documented across the peri-Vocontian Urgonian platforms. The final demise of the Urgonian-type rudistid regime, previously linked to the onset of the Oceanic Anoxic Event 1a, rather correlates to the intermittently anoxic Taxy episode. These results call for a reconsideration of the chronology of events controlling the development of Urgonian shallow-water carbonate systems through the Barremian.
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Late Barremian–early Aptian ammonite bioevents from the Urgonian-type series of Provence, southeast France: Regional stratigraphic correlations and implications for dating the peri-Vocontian carbonate platforms
Cretaceous Research, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Anthony J.-b. Tendil, Antoine Pictet, Cyprien Lanteaume, Luc Bulot, Jean Borgomano, Tim Luber, Jonathan Redfern, Philippe LeonideAbstract:This work provides a new ammonite age-calibration of the rudistid limestones of the Urgonian-type Provence carbonate platform (Southeast France) based on sampling along three ~200 km-long platform-to-basin transects and re-examination of historical collections. Ammonite key findings indicate that the first rudistid platform stage (including the Agriopleura and requieniidemonopleurid beds) develops and spreads northward through the Toxancyloceras vandenheckii-Gerhardtia sartousiana zones interval (lower upper Barremian). This stage is interrupted by the tectonically-induced deepening of the southern Provence domain during the Imerites giraudi Zone while the northern regions records the massive deposition of Palorbitolina-Heteraster beds. Recovery of the rudistid carbonate system is illustrated by the development of caprinid-bearing rudistid limestones in the North Provence domain through the Martelites sarasini Subzone (lower Martelites sarasini Zone, uppermost Barremian), which shows a bidirectional progradation toward the South Provence and Vocontian basins. The caprinid-bearing limestones terminate at a shortterm exposure and are overlain by cherty-oobioclastic deposits spanning the Pseudocrioceras waagenoides Subzone (upper M. sarasini Zone) to the lower Deshayesites forbesi Zone. A regional-wide flooding of the study area is illustrated by the abrupt change to a marl-dominated regime occurring in the upper D. forbesi Zone. Compared to the previous datings, the Barremian/Aptian boundary should be relocated in the lower part of the post-caprinid, cherty-oobioclastic deposits although its precise level cannot be fixed due to the lack of a continuous ammonite record. Ammonite age-calibration of the surrounding Urgonian rudistid platform series is discussed and gives evidence of a comparable twofold demise of the peri-Vocontian rudistid biota during the uppermost Barremian. Accordingly, the link between the final demise of the peri-Vocontian rudistid biota and the onset and/or culmination of the mid-early Aptian Oceanic Anoxic Event (OAE) 1a should be reconsidered.
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late Barremian early aptian ammonite bioevents from the urgonian type series of provence southeast france regional stratigraphic correlations and implications for dating the peri vocontian carbonate platforms
Cretaceous Research, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Luc G. Bulot, Anthony J.-b. Tendil, Antoine Pictet, Cyprien Lanteaume, Jean Borgomano, Tim Luber, Jonathan Redfern, Philippe LeonideAbstract:Abstract This work provides a new ammonite age-calibration of the rudistid limestones of the Urgonian-type Provence carbonate platform (Southeast France) based on sampling along three ∼200 km-long platform-to-basin transects and re-examination of historical collections. Ammonite key findings indicate that the first rudistid platform stage (including the Agriopleura and requieniid–monopleurid beds) develops and spreads northward through the Toxancyloceras vandenheckii – Gerhardtia sartousiana zones interval (lower upper Barremian). This stage is interrupted by the tectonically-induced deepening of the southern Provence domain during the Imerites giraudi Zone while the northern regions records the massive deposition of Palorbitolina – Heteraster beds. Recovery of the rudistid carbonate system is illustrated by the development of caprinid-bearing rudistid limestones in the North Provence domain through the Martelites sarasini Subzone (lower Martelites sarasini Zone, uppermost Barremian), which shows a bidirectional progradation toward the South Provence and Vocontian basins. The caprinid-bearing limestones terminate at a short-term exposure and are overlain by cherty–oobioclastic deposits spanning the Pseudocrioceras waagenoides Subzone (upper M. sarasini Zone) to the lower Deshayesites forbesi Zone. A regional-wide flooding of the study area is illustrated by the abrupt change to a marl-dominated regime occurring in the upper D. forbesi Zone. Compared to the previous datings, the Barremian/Aptian boundary should be relocated in the lower part of the post-caprinid, cherty–oobioclastic deposits although its precise level cannot be fixed due to the lack of a continuous ammonite record. Ammonite age-calibration of the surrounding Urgonian rudistid platform series is discussed and gives evidence of a comparable twofold demise of the peri-Vocontian rudistid biota during the uppermost Barremian. Accordingly, the link between the final demise of the peri-Vocontian rudistid biota and the onset and/or culmination of the mid-early Aptian Oceanic Anoxic Event (OAE) 1a should be reconsidered.
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The Aptian GSSP candidate at Gorgo a Cerbara (Central Italy): an alternative interpretation of the bio-, litho- and chemostratigraphic markers
Newsletters on Stratigraphy, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Anthony J.-b. Tendil, Luc Bulot, Gérard Delanoy, Josep Moreno-bedmar, Cyprien LanteaumeAbstract:The Maiolica-type Gorgo a Cerbara section (Central Italy) was proposed as GSSP candidate for defining the base of the Aptian Stage with the base of the reverse magnetochron CM0r as the primary datum. Comparison with well-documented, ammonite-bearing successions of southeast France shows that the bio-, litho- and chemostratigraphic events recorded in Italy, below, at, and above this magnetochron fall within the Martelites sarasini ammonite Zone. Since there is an agreement that the M. sarasini Zone is the last ammonite zone of the Barremian, the use of the base of magnetozone CM0r as a datum to define the Barremian/Aptian boundary is questioned.
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Is Strontium-isotope stratigraphy a reliable tool for dating shallow-marine platform carbonates at the Barremian-Aptian transition? Review of western Tethyan case studies
Carnets de Géologie, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Mukerrem Fenerci-masse, Anthony J.-b. Tendil, Antoine Pictet, Cyprien LanteaumeAbstract:Strontium-isotope measurements on Lower Cretaceous marine rocks derive from belemnite material sampled in ammonite-constrained basinal successions. A group of values with a narrow range across the Barremian/Aptian boundary does not allow the separation of the uppermost Barremian (Martelites sarasini ammonite zone) from the lower Aptian pro parte (Deshayesites oglanlensis-D. forbesi ammonite zones). Growing numbers of studies applied Sr-Isotope Stratigraphy (SIS) on Barremian-Aptian shallow-marine sequences (Urgonian facies) in order to solve controversial results obtained by using different shallow-water biological time markers. Based on re-examination of case studies, we conclude that Sr-isotope values can neither be used to prove nor to disprove the location of the putative Barremian/Aptian boundary based on biostratigraphy. Pending more data available, SIS should be used with caution for dating ammonite-free carbonate sediments in the corresponding time interval.
Philippe Leonide - One of the best experts on this subject based on the ideXlab platform.
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platform to basin anatomy of a Barremian aptian tethyan carbonate system new insights into the regional to global factors controlling the stratigraphic architecture of the urgonian provence platform southeast france
Cretaceous Research, 2018Co-Authors: Anthony J.-b. Tendil, Jean-pierre Masse, Camille Frau, Cyprien Lanteaume, Philippe Leonide, Francois Fournier, Jean Borgomano, Gerard Massonnat, Jeanpaul RolandoAbstract:Abstract The recognition of regional ammonite bio-events spanning the late Barremian–early Aptian interval in Provence invalidates previous chronostratigraphic models of the Urgonian carbonate platform. Based on high-resolution correlations across the Provence platform and the Vocontian Basin, this study provides a comprehensive revision of the temporal and spatial evolution of this sedimentary system through the definition of seven depositional sequences. Close to the early–late Barremian transition, the South Provence domain was marked by the inception of rudistid, Agriopleura-dominated, carbonates, while further to the North, the expansion of the latter biota was delayed, presumably due to greater subsidence rates driven by extensive E–W-trending basement faults. Northward installation of a rudist-rich succession in the North Provence region – including, from oldest to youngest, the Agriopleura, requieniid–monopleurid and caprinid episodes – strictly spans the late Barremian. Intermittent shedding of platform-derived material influenced the basinal series in the pre-Vocontian margin at that time. Structural inheritance and active contribution of syn-sedimentary tectonics into the stratigraphic architecture are suggested through similar orientation of depositional environment belts along with important thickness and facies variations within the North Provence area. Large-scale deformation due to the progressive rotation of the Iberian plate is likely to have direct implications into the Provence domain. Concomitant rudistid production crises, replaced by mass occurrence of Palorbitolina deposits, are documented across the peri-Vocontian Urgonian platforms. The final demise of the Urgonian-type rudistid regime, previously linked to the onset of the Oceanic Anoxic Event 1a, rather correlates to the intermittently anoxic Taxy episode. These results call for a reconsideration of the chronology of events controlling the development of Urgonian shallow-water carbonate systems through the Barremian.
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Late Barremian–early Aptian ammonite bioevents from the Urgonian-type series of Provence, southeast France: Regional stratigraphic correlations and implications for dating the peri-Vocontian carbonate platforms
Cretaceous Research, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Anthony J.-b. Tendil, Antoine Pictet, Cyprien Lanteaume, Luc Bulot, Jean Borgomano, Tim Luber, Jonathan Redfern, Philippe LeonideAbstract:This work provides a new ammonite age-calibration of the rudistid limestones of the Urgonian-type Provence carbonate platform (Southeast France) based on sampling along three ~200 km-long platform-to-basin transects and re-examination of historical collections. Ammonite key findings indicate that the first rudistid platform stage (including the Agriopleura and requieniidemonopleurid beds) develops and spreads northward through the Toxancyloceras vandenheckii-Gerhardtia sartousiana zones interval (lower upper Barremian). This stage is interrupted by the tectonically-induced deepening of the southern Provence domain during the Imerites giraudi Zone while the northern regions records the massive deposition of Palorbitolina-Heteraster beds. Recovery of the rudistid carbonate system is illustrated by the development of caprinid-bearing rudistid limestones in the North Provence domain through the Martelites sarasini Subzone (lower Martelites sarasini Zone, uppermost Barremian), which shows a bidirectional progradation toward the South Provence and Vocontian basins. The caprinid-bearing limestones terminate at a shortterm exposure and are overlain by cherty-oobioclastic deposits spanning the Pseudocrioceras waagenoides Subzone (upper M. sarasini Zone) to the lower Deshayesites forbesi Zone. A regional-wide flooding of the study area is illustrated by the abrupt change to a marl-dominated regime occurring in the upper D. forbesi Zone. Compared to the previous datings, the Barremian/Aptian boundary should be relocated in the lower part of the post-caprinid, cherty-oobioclastic deposits although its precise level cannot be fixed due to the lack of a continuous ammonite record. Ammonite age-calibration of the surrounding Urgonian rudistid platform series is discussed and gives evidence of a comparable twofold demise of the peri-Vocontian rudistid biota during the uppermost Barremian. Accordingly, the link between the final demise of the peri-Vocontian rudistid biota and the onset and/or culmination of the mid-early Aptian Oceanic Anoxic Event (OAE) 1a should be reconsidered.
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late Barremian early aptian ammonite bioevents from the urgonian type series of provence southeast france regional stratigraphic correlations and implications for dating the peri vocontian carbonate platforms
Cretaceous Research, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Luc G. Bulot, Anthony J.-b. Tendil, Antoine Pictet, Cyprien Lanteaume, Jean Borgomano, Tim Luber, Jonathan Redfern, Philippe LeonideAbstract:Abstract This work provides a new ammonite age-calibration of the rudistid limestones of the Urgonian-type Provence carbonate platform (Southeast France) based on sampling along three ∼200 km-long platform-to-basin transects and re-examination of historical collections. Ammonite key findings indicate that the first rudistid platform stage (including the Agriopleura and requieniid–monopleurid beds) develops and spreads northward through the Toxancyloceras vandenheckii – Gerhardtia sartousiana zones interval (lower upper Barremian). This stage is interrupted by the tectonically-induced deepening of the southern Provence domain during the Imerites giraudi Zone while the northern regions records the massive deposition of Palorbitolina – Heteraster beds. Recovery of the rudistid carbonate system is illustrated by the development of caprinid-bearing rudistid limestones in the North Provence domain through the Martelites sarasini Subzone (lower Martelites sarasini Zone, uppermost Barremian), which shows a bidirectional progradation toward the South Provence and Vocontian basins. The caprinid-bearing limestones terminate at a short-term exposure and are overlain by cherty–oobioclastic deposits spanning the Pseudocrioceras waagenoides Subzone (upper M. sarasini Zone) to the lower Deshayesites forbesi Zone. A regional-wide flooding of the study area is illustrated by the abrupt change to a marl-dominated regime occurring in the upper D. forbesi Zone. Compared to the previous datings, the Barremian/Aptian boundary should be relocated in the lower part of the post-caprinid, cherty–oobioclastic deposits although its precise level cannot be fixed due to the lack of a continuous ammonite record. Ammonite age-calibration of the surrounding Urgonian rudistid platform series is discussed and gives evidence of a comparable twofold demise of the peri-Vocontian rudistid biota during the uppermost Barremian. Accordingly, the link between the final demise of the peri-Vocontian rudistid biota and the onset and/or culmination of the mid-early Aptian Oceanic Anoxic Event (OAE) 1a should be reconsidered.
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platform to basin anatomy of a Barremian aptian tethyan carbonate system new insights into the regional to global factors controlling the stratigraphic architecture of the urgonian provence platform southeast france
Cretaceous Research, 2018Co-Authors: Anthony J.-b. Tendil, Jean-pierre Masse, Camille Frau, Cyprien Lanteaume, Philippe Leonide, Francois Fournier, Jean Borgomano, Gerard Massonnat, Jeanpaul RolandoAbstract:Abstract The recognition of regional ammonite bio-events spanning the late Barremian–early Aptian interval in Provence invalidates previous chronostratigraphic models of the Urgonian carbonate platform. Based on high-resolution correlations across the Provence platform and the Vocontian Basin, this study provides a comprehensive revision of the temporal and spatial evolution of this sedimentary system through the definition of seven depositional sequences. Close to the early–late Barremian transition, the South Provence domain was marked by the inception of rudistid, Agriopleura-dominated, carbonates, while further to the North, the expansion of the latter biota was delayed, presumably due to greater subsidence rates driven by extensive E–W-trending basement faults. Northward installation of a rudist-rich succession in the North Provence region – including, from oldest to youngest, the Agriopleura, requieniid–monopleurid and caprinid episodes – strictly spans the late Barremian. Intermittent shedding of platform-derived material influenced the basinal series in the pre-Vocontian margin at that time. Structural inheritance and active contribution of syn-sedimentary tectonics into the stratigraphic architecture are suggested through similar orientation of depositional environment belts along with important thickness and facies variations within the North Provence area. Large-scale deformation due to the progressive rotation of the Iberian plate is likely to have direct implications into the Provence domain. Concomitant rudistid production crises, replaced by mass occurrence of Palorbitolina deposits, are documented across the peri-Vocontian Urgonian platforms. The final demise of the Urgonian-type rudistid regime, previously linked to the onset of the Oceanic Anoxic Event 1a, rather correlates to the intermittently anoxic Taxy episode. These results call for a reconsideration of the chronology of events controlling the development of Urgonian shallow-water carbonate systems through the Barremian.
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Late Barremian–early Aptian ammonite bioevents from the Urgonian-type series of Provence, southeast France: Regional stratigraphic correlations and implications for dating the peri-Vocontian carbonate platforms
Cretaceous Research, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Anthony J.-b. Tendil, Antoine Pictet, Cyprien Lanteaume, Luc Bulot, Jean Borgomano, Tim Luber, Jonathan Redfern, Philippe LeonideAbstract:This work provides a new ammonite age-calibration of the rudistid limestones of the Urgonian-type Provence carbonate platform (Southeast France) based on sampling along three ~200 km-long platform-to-basin transects and re-examination of historical collections. Ammonite key findings indicate that the first rudistid platform stage (including the Agriopleura and requieniidemonopleurid beds) develops and spreads northward through the Toxancyloceras vandenheckii-Gerhardtia sartousiana zones interval (lower upper Barremian). This stage is interrupted by the tectonically-induced deepening of the southern Provence domain during the Imerites giraudi Zone while the northern regions records the massive deposition of Palorbitolina-Heteraster beds. Recovery of the rudistid carbonate system is illustrated by the development of caprinid-bearing rudistid limestones in the North Provence domain through the Martelites sarasini Subzone (lower Martelites sarasini Zone, uppermost Barremian), which shows a bidirectional progradation toward the South Provence and Vocontian basins. The caprinid-bearing limestones terminate at a shortterm exposure and are overlain by cherty-oobioclastic deposits spanning the Pseudocrioceras waagenoides Subzone (upper M. sarasini Zone) to the lower Deshayesites forbesi Zone. A regional-wide flooding of the study area is illustrated by the abrupt change to a marl-dominated regime occurring in the upper D. forbesi Zone. Compared to the previous datings, the Barremian/Aptian boundary should be relocated in the lower part of the post-caprinid, cherty-oobioclastic deposits although its precise level cannot be fixed due to the lack of a continuous ammonite record. Ammonite age-calibration of the surrounding Urgonian rudistid platform series is discussed and gives evidence of a comparable twofold demise of the peri-Vocontian rudistid biota during the uppermost Barremian. Accordingly, the link between the final demise of the peri-Vocontian rudistid biota and the onset and/or culmination of the mid-early Aptian Oceanic Anoxic Event (OAE) 1a should be reconsidered.
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late Barremian early aptian ammonite bioevents from the urgonian type series of provence southeast france regional stratigraphic correlations and implications for dating the peri vocontian carbonate platforms
Cretaceous Research, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Luc G. Bulot, Anthony J.-b. Tendil, Antoine Pictet, Cyprien Lanteaume, Jean Borgomano, Tim Luber, Jonathan Redfern, Philippe LeonideAbstract:Abstract This work provides a new ammonite age-calibration of the rudistid limestones of the Urgonian-type Provence carbonate platform (Southeast France) based on sampling along three ∼200 km-long platform-to-basin transects and re-examination of historical collections. Ammonite key findings indicate that the first rudistid platform stage (including the Agriopleura and requieniid–monopleurid beds) develops and spreads northward through the Toxancyloceras vandenheckii – Gerhardtia sartousiana zones interval (lower upper Barremian). This stage is interrupted by the tectonically-induced deepening of the southern Provence domain during the Imerites giraudi Zone while the northern regions records the massive deposition of Palorbitolina – Heteraster beds. Recovery of the rudistid carbonate system is illustrated by the development of caprinid-bearing rudistid limestones in the North Provence domain through the Martelites sarasini Subzone (lower Martelites sarasini Zone, uppermost Barremian), which shows a bidirectional progradation toward the South Provence and Vocontian basins. The caprinid-bearing limestones terminate at a short-term exposure and are overlain by cherty–oobioclastic deposits spanning the Pseudocrioceras waagenoides Subzone (upper M. sarasini Zone) to the lower Deshayesites forbesi Zone. A regional-wide flooding of the study area is illustrated by the abrupt change to a marl-dominated regime occurring in the upper D. forbesi Zone. Compared to the previous datings, the Barremian/Aptian boundary should be relocated in the lower part of the post-caprinid, cherty–oobioclastic deposits although its precise level cannot be fixed due to the lack of a continuous ammonite record. Ammonite age-calibration of the surrounding Urgonian rudistid platform series is discussed and gives evidence of a comparable twofold demise of the peri-Vocontian rudistid biota during the uppermost Barremian. Accordingly, the link between the final demise of the peri-Vocontian rudistid biota and the onset and/or culmination of the mid-early Aptian Oceanic Anoxic Event (OAE) 1a should be reconsidered.
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The Aptian GSSP candidate at Gorgo a Cerbara (Central Italy): an alternative interpretation of the bio-, litho- and chemostratigraphic markers
Newsletters on Stratigraphy, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Anthony J.-b. Tendil, Luc Bulot, Gérard Delanoy, Josep Moreno-bedmar, Cyprien LanteaumeAbstract:The Maiolica-type Gorgo a Cerbara section (Central Italy) was proposed as GSSP candidate for defining the base of the Aptian Stage with the base of the reverse magnetochron CM0r as the primary datum. Comparison with well-documented, ammonite-bearing successions of southeast France shows that the bio-, litho- and chemostratigraphic events recorded in Italy, below, at, and above this magnetochron fall within the Martelites sarasini ammonite Zone. Since there is an agreement that the M. sarasini Zone is the last ammonite zone of the Barremian, the use of the base of magnetozone CM0r as a datum to define the Barremian/Aptian boundary is questioned.
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Is Strontium-isotope stratigraphy a reliable tool for dating shallow-marine platform carbonates at the Barremian-Aptian transition? Review of western Tethyan case studies
Carnets de Géologie, 2018Co-Authors: Camille Frau, Jean-pierre Masse, Mukerrem Fenerci-masse, Anthony J.-b. Tendil, Antoine Pictet, Cyprien LanteaumeAbstract:Strontium-isotope measurements on Lower Cretaceous marine rocks derive from belemnite material sampled in ammonite-constrained basinal successions. A group of values with a narrow range across the Barremian/Aptian boundary does not allow the separation of the uppermost Barremian (Martelites sarasini ammonite zone) from the lower Aptian pro parte (Deshayesites oglanlensis-D. forbesi ammonite zones). Growing numbers of studies applied Sr-Isotope Stratigraphy (SIS) on Barremian-Aptian shallow-marine sequences (Urgonian facies) in order to solve controversial results obtained by using different shallow-water biological time markers. Based on re-examination of case studies, we conclude that Sr-isotope values can neither be used to prove nor to disprove the location of the putative Barremian/Aptian boundary based on biostratigraphy. Pending more data available, SIS should be used with caution for dating ammonite-free carbonate sediments in the corresponding time interval.
