The Experts below are selected from a list of 13362 Experts worldwide ranked by ideXlab platform
Nicolas Thibault - One of the best experts on this subject based on the ideXlab platform.
-
The Santonian-Campanian Boundary Event (SCBE) in boreal basins: new geochemical and mineralogical data from the Northern Chalk Province (East Yorkshire, UK).
Cretaceous Research, 2019Co-Authors: Matthieu Deville De Périère, Pierre Pellenard, Nicolas ThibaultAbstract:The Upper Cretaceous Flamborough Chalk Formation of the English Northern Chalk Province (Danes Dyke section, East Yorkshire, UK) has been sampled for isotope analyses to test for the expression of the positive carbon-isotope excursion defining the Santonian–Campanian Boundary Event (SCBE) in northern England, and to improve basin-scale correlations between the Boreal and Tethyan realms. Clay mineral investigations have been conducted in order to characterise potential variations in the detrital flux between the top of the Santonian and the base of the Campanian, and to test relationships with the SCBE. In the Flamborough Chalk and in other chalk sections, the Santonian/Campanian boundary is defined by the highest occurrence datum of the crinoid Marsupites. Carbon isotope results in this section indicate the presence of the negative Foreness Event in the upper Santonian, while the SCBE is characterised by a double positive excursion with peaks respectively named ‘a’ and ‘b’. The first peak of the SCBE (a) lies in the uppermost part of the Marsupites Zone and therefore belongs to the upper Santonian. Peak b of the SCBE is located above the highest occurrence of Marsupites and is thus partially included in the Uintacrinus anglicus Zone of the lower Campanian. The clay fraction (
-
Integrated bio- and carbon-isotope stratigraphy of the Upper Cretaceous Gurpi Formation (Iran): a new reference for the eastern Tethys and its implications for large-scale correlation of stage boundaries.
Cretaceous Research, 2018Co-Authors: Mohammad J. Razmjooei, Nicolas Thibault, Anoshiravan Kani, Jaume Dinarès-turell, Emmanuelle Pucéat, Samira Shahriari, Wiesława Radmacher, Amir Mohammad Jamali, Clemens V. Ullmann, Silke VoigtAbstract:A high-resolution stratigraphic analysis of the Upper Cretaceous Gurpi Formation has been undertaken in the Shahneshin section (Zagros Basin, Iran). New results on calcareous nannofossils, planktic foraminifers, dinoflagellate cysts and high-resolution carbon and oxygen stable isotopes form the basis of a reference section for the eastern Tethys that spans the upper Coniacian to the late Danian. Carbon-isotope correlation to Gubbio, Italy and the NW German chalk allows for the identification of many isotopic events as well as for the definition of new events in the Campanian and Maastrichtian. Our results allow for a review of the accurate position of the Coniacian/Santonian, Santonian/Campanian, and Campanian/Maastrichtian stage boundaries relative to carbon isotopes and plankton bioevents. The reliability of Coniacian to Maastrichtian planktic foraminifer, dinoflagellate cysts and calcareous nannofossil biohorizons is assessed.
-
an integrated stratigraphic study across the santonian Campanian boundary at bocieniec southern poland a new boundary stratotype candidate
Cretaceous Research, 2017Co-Authors: Zofia Dubicka, Nicolas Thibault, Agata Jurkowska, Mohammad Javad Razmjooei, Krystian Wojcik, Przemyslaw Gorzelak, Ireneusz FelisiakAbstract:Abstract An integrated biostratigraphic (foraminifera, calcareous nannofossils, crinoids), chemostratigraphic (stable carbon isotopes) and magnetostratigraphic study of the Bocieniec section (southern Poland) is presented here. The section presents a continuous and lithologically monotonous sedimentary record across the Santonian–Campanian boundary transition. A large number of macrofossil, foraminiferal and calcareous nannofossil bioevents along with several well-identified carbon-isotope excursions of the upper Santonian and lowermost Campanian are documented. The base of the Campanian is well-constrained by the last occurrence (LO) of the crinoid Marsupites testudinarius , and correlates to the onset of the first δ 13 C positive peak of the Santonian–Campanian Boundary Event (SCBE peak a). A presumable primary Cretaceous paleomagnetic signal highlights the potential presence of the C34N/C33R magnetic reversal although its exact position remains uncertain between peaks a and b of the SCBE. The planktic foraminifer Dicarinella asymetrica is very rare at Bocieniec but a potential LO of this important marker may be recorded in coincidence with peak b of the SCBE. The first occurrence (FO) of calcareous nannofossil Broinsonia parca parca coincides with the lower part of chron C33R and with the early Campanian pilula zone event. A large set of additional nannofossil events and benthic foraminifer events further constrain the stratigraphy of the section and along with the carbon isotopes, allows for correlation with other important sections of the Boreal realm. Although the Bocieniec section is relatively thin and condensed (5.5 m), the successive order of events and presence of all past proposed stratigraphic criteria for the Santonian-Campanian boundary makes it the most complete reference section for this interval at the European and at the global scale. Moreover, this section allows for a precise correlation of the Tethyan and Boreal domains. The Bocieniec section fulfils the geological criteria to be a potential boundary stratotype candidate for the base of the Campanian Stage.
-
Clay mineralogical and geochemical expressions of the “Late Campanian Event” in the Aquitaine and Paris basins (France): palaeoenvironmental implications.
Palaeogeography Palaeoclimatology Palaeoecology, 2016Co-Authors: Elise Chenot, Nicolas Thibault, Pierre Pellenard, Mathieu Martinez, Jean-françois Deconinck, Philippe Amiotte-suchet, Ludovic Bruneau, Théophile Cocquerez, Rémi Laffont, Emmanuelle PucéatAbstract:Campanian sediments from two French sedimentary basins were studied, using clay mineralogy and stable isotope (δ13C and δ18O) geochemistry, in order to investigate the Late Campanian Event. The clay fraction of the Campanian sediments from the Tercis-les-Bains section (Aquitaine Basin) and from the Poigny borehole (Paris Basin) is mainly composed of smectite. This background sedimentation was, however, interrupted during the Upper Campanian in the two basins by a substantial increase in detrital inputs, including illite, kaolinite, and chlorite at Tercis-les-Bains, and illite at Poigny. This detrital event, resulting from the enhanced erosion of nearby continental areas triggered by increasing runoff, has also been recognized in the Tethys and South Atlantic oceans. It coincided with a global negative carbon isotope excursion, the Late Campanian Event (LCE). Carbon isotope stratigraphy was used to correlate the two basins with previously studied sections from distant areas. Spectral analysis of the bulk δ13C from Tercis-les-Bains suggests a duration of ca. 400 kyr for a pre-LCE negative excursion and ca. 800–900 kyr for the LCE sensu stricto. The detrital event, as characterized by clay mineralogy, spans the interval that comprises the pre-LCE and the LCE, with a duration of 1.3 Myr. Intensification of continental erosion during the LCE may have resulted either from the Late Campanian polyplocum regression and/or from a regional tectonic pulse that triggered the emersion of previous submerged shelf areas and the increase of silicate erosion. As the LCE seems to be recorded at a large geographic scale, it is proposed here that enhanced chemical weathering and an associated decrease in atmospheric pCO2 levels could have contributed to the long-term Late Cretaceous cooling trend.
-
Orbital calibration of the late Campanian carbon isotope event in the North Sea
Journal of the Geological Society, 2015Co-Authors: Anastasios Perdiou, Nicolas Thibault, Kresten Anderskouv, Frans Van Buchem, Govert Joan Arie Buijs, Christian J. BjerrumAbstract:A new record of carbon isotopes, nannofossil biostratigraphy, gamma-ray and Fe content variations is presented for the upper Campanian of the Adda-3 core, Danish Central Graben, North Sea. The studied interval provides a revision of previously assigned late Coniacian to early Santonian ages. New biostratigraphic data indicate a late Campanian age for the 60 m thick studied interval. The Late Campanian Event (LCE) is well recorded by a 1.5‰ negative excursion in the bulk δ 13 C, along with two stepwise pre-excursion negative shifts (defining the pre-LCE). The amplitude of the LCE appears higher in the North Sea than in other areas as seen from the correlation to Germany, the UK and France. This correlation allows identification of a new 0.4‰ negative excursion (defined as the conica event). Fe and gamma-ray variations are used to calibrate the record with cyclostratigraphy. Fourteen 405 kyr cycles identified in the upper Campanian of Adda-3 can be correlated to North Germany. The compilation of previous results from North Germany and correlation to Adda-3 shows that the Boreal upper Campanian spans a total of 17 cycles each of 405 kyr; that is, 6.885 myr. The duration of the LCE is estimated to be c . 1 myr at Adda-3 and in North Germany. Supplementary materials: Calibration of the HH-XRF data is available at https://doi.org/10.6084/m9.figshare.c.2134362.
Erik Wolfgring - One of the best experts on this subject based on the ideXlab platform.
-
Late Cretaceous stratigraphy in the Mudurnu─Göynük Basin (Turkey) and inferences on sea-level change in the Late Campanian to Early Maastrichtian
Geological Society London Special Publications, 2019Co-Authors: Erik Wolfgring, Ismail Omer Yilmaz, Liu Shasha, Katharina BoehmAbstract:Upper Cretaceous strata at Goynuk, northwestern Anatolia, Turkey, provide a geological record of the Campanian–Maastrichtian from the Sakarya Terrane along the active Neotethys margin. Shales and shaly marls with siliciclastic and volcaniclastic intercalations indicate a pelagic palaeoenvironment rich in planktonic and benthonic foraminifera and calcareous nannofossil assemblages. A composite record from the Campanian to the Maastrichtian records nannofossil standard zones UC15c (CC21) to UC20a (CC26) as well as the Globotrunanella havanensis planktonic foraminifera Zone to the Racemiguembelina fructicosa planktonic foraminifera Zone. The complete ‘mid’-Campanian to early Maastrichtian composite section can be correlated to other western Tethyan sections. The Campanian–Maastrichtian boundary is positioned between the first occurrence of the planktonic foraminifera Gansserina gansseri and the last occurrence of the nannofossil Uniplanarius trifidus. Clastic input and higher sedimentation rates constrain regional sea-level lowstands around the late Campanian calcarata Zone and the Campanian–Maastrichtian boundary, corresponding to the Campanian–Maastrichtian boundary event.
-
the santonian Campanian boundary and the end of the long cretaceous normal polarity chron isotope and plankton stratigraphy of a pelagic reference section in the nw tethys austria
Newsletters on Stratigraphy, 2018Co-Authors: Erik Wolfgring, Katharina Böhm, Susanne Gier, Benjamin Sames, Christoph Spötl, Jaume Dinaresturell, Friedrich PoppAbstract:The base of the Campanian still lacks a designated primary marker and a defined GSSP (Global Boundary Stratotype Section and Point). We present a Santonian–Campanian boundary section from the Postalm in the Northern Calcareous Alps of Austria as a possible reference section for the northwestern Tethys. Including nearby complementary Gosau Group sections, the stratigraphy for this time interval is based on palaeomagnetic and stable isotope data, planktonic foraminifera and calcareous nannoplankton bio-stratigraphy, and strontium isotope stratigraphy, together with published ammonite, crinoid and inoceramid data. The Postalm section shows a deepening trend from upper Santonian conglomerates and grey shelf marls to pelagic bathyal red marly limestones of mainly Campanian age. Palaeomagnetic data allow identifying the top of the Long Cretaceous Normal Polarity-Chron C34n and the following reversal in the lower part of the red marly limestones. A 1 m-thick interval of high magnetic susceptibility is present at the end of C34n. Two of the main suggested biomarkers to pinpoint the Santonian–Campanian boundary, i. e. the last occurrence of the planktonic foraminifer Dicarinella asymetrica and the first occurrence of the nannofossil Broinsonia parca parca, occur in close proximity above the reversal, which is suggested herein as the main marker event for the base of the Campanian. Strontium isotope stratigraphy indicates a value of 0.707534 (mean of four measurements at the boundary interval) for the base of the Campanian in the Postalm section. Both carbon and oxygen isotope values show a negative excursion just below the boundary. The positive Santonian–Campanian carbon isotope event starts probably just below the reversal but seems to be diagenetically distorted. This interval is considered to correspond to a short sea-level high in the late Santonian followed by a distinct lowstand at the Santonian–Campanian boundary.
-
plankton biostratigraphy and magnetostratigraphy of the santonian Campanian boundary interval in the mudurnu goynuk basin northwestern turkey
Cretaceous Research, 2017Co-Authors: Erik Wolfgring, Ismail Omer Yilmaz, Jaume Dinaresturell, Katharina BöhmAbstract:Abstract The Santonian–Campanian boundary interval close to the village of Goynuk in northwestern Turkey (Bolu province) was recorded and examined with respect to nannofossil and foraminiferal biostratigraphy, magnetic polarity and magnetic susceptibility. During the Late Cretaceous, the Mudurnu–Goynuk Basin was located on the Sakarya continent situated in the northwestern Tethyan Realm, north of the Neo-Tethys. The sections assessed for the present study comprise hemipelagic to pelagic deposits. Five localities were examined and a composite record spanning the Santonian–Campanian boundary was established. The stratigraphically older parts are characterised by uniform reddish limestone, while we frequently recorded shaly marls and marly limestones with recurrent tuff intercalations in the younger subsections. A biostratigraphic investigation of planktonic foraminifera and calcareous nannoplankton assemblages, together with magnetostratigraphy, provides a stratigraphic framework that allows to home in on the Santonian–Campanian boundary. Thus, biostratigraphic data suggest an age that ranges from the late Santonian Dicarinella asymetrica to the early Campanian Globotruncanita elevata planktonic foraminifera biozones, and calcareous nannofossil zones UC12–UC14 and CC16–CC18. The magnetostratigraphic assessment finds a palaeomagnetic reversal that can be recognised as the basal Campanian reversal C33r above polarity chron 34n, the Long Cretaceous Normal. Field magnetic susceptibility (MS) data show a distinct cyclic pattern in the lower Campanian. Sinusoidal patterns in the MS signature curve can presumably be interpreted as the 400 kyr orbital eccentricity cycle, and subsequent smaller-scale cycles of obliquity and precession can be identified even though volcanic activity impacted sedimentation. A sediment accumulation rate of 12 mm/kyr can be inferred for one of the sections.
-
assessing pelagic palaeoenvironments using foraminiferal assemblages a case study from the late Campanian radotruncana calcarata zone upper cretaceous austrian alps
Palaeogeography Palaeoclimatology Palaeoecology, 2016Co-Authors: Erik Wolfgring, Johann Hohenegger, Michael WagreichAbstract:Abstract Two upper Campanian sections in the Austrian Alps representing the north western Tethyan biogeographic realm from either sides of the Penninic Ocean (Alpine Tethys) have been examined aiming at a high-resolution assessment of foraminiferal assemblages: the Postalm section from the Northern Calcareous Alps (southern active margin) and the Oberhehenfeld section from the Ultrahelvetics (northern passive margin). This study focuses on plankton biostratigraphy and foraminiferal palaeoecology of the Radotruncana calcarata Total Range Zone. The Postalm section displays cyclic red deposits with marls and marly limestones, while we find uniform grey marls at Oberhehenfeld. The Oberhehenfeld section from the Ultrahelvetics can be correlated stratigraphically to the Postalm section using foraminifera, calcareous nannoplankton and stable isotope stratigraphy, and provides a point of comparison from the northern margin of the Penninic Ocean. The two sections show minimal difference in faunal composition and few distinct local stratigraphic signals. Palaeoenvironmental trends from the late Campanian can be recognised relating the two sections from the Austrian Alps. The depositional water depth can be reconstructed as some 500–800 m. Plankton assemblages show a remarkable stability despite the sudden appearance and disappearance of R. calcarata, hinting at the late Campanian as a time interval of general foraminiferal stasis without significant evolutionary events. We speculate that the origin and extinction of R. calcarata are related to the prolonged evolution of ocean stratification during the Campanian from the mid-Cretaceous sluggish hothouse during a time of general slow greenhouse climate decline.
Pierre Pellenard - One of the best experts on this subject based on the ideXlab platform.
-
The Santonian-Campanian Boundary Event (SCBE) in boreal basins: new geochemical and mineralogical data from the Northern Chalk Province (East Yorkshire, UK).
Cretaceous Research, 2019Co-Authors: Matthieu Deville De Périère, Pierre Pellenard, Nicolas ThibaultAbstract:The Upper Cretaceous Flamborough Chalk Formation of the English Northern Chalk Province (Danes Dyke section, East Yorkshire, UK) has been sampled for isotope analyses to test for the expression of the positive carbon-isotope excursion defining the Santonian–Campanian Boundary Event (SCBE) in northern England, and to improve basin-scale correlations between the Boreal and Tethyan realms. Clay mineral investigations have been conducted in order to characterise potential variations in the detrital flux between the top of the Santonian and the base of the Campanian, and to test relationships with the SCBE. In the Flamborough Chalk and in other chalk sections, the Santonian/Campanian boundary is defined by the highest occurrence datum of the crinoid Marsupites. Carbon isotope results in this section indicate the presence of the negative Foreness Event in the upper Santonian, while the SCBE is characterised by a double positive excursion with peaks respectively named ‘a’ and ‘b’. The first peak of the SCBE (a) lies in the uppermost part of the Marsupites Zone and therefore belongs to the upper Santonian. Peak b of the SCBE is located above the highest occurrence of Marsupites and is thus partially included in the Uintacrinus anglicus Zone of the lower Campanian. The clay fraction (
-
Clay mineralogical and geochemical expressions of the “Late Campanian Event” in the Aquitaine and Paris basins (France): palaeoenvironmental implications.
Palaeogeography Palaeoclimatology Palaeoecology, 2016Co-Authors: Elise Chenot, Nicolas Thibault, Pierre Pellenard, Mathieu Martinez, Jean-françois Deconinck, Philippe Amiotte-suchet, Ludovic Bruneau, Théophile Cocquerez, Rémi Laffont, Emmanuelle PucéatAbstract:Campanian sediments from two French sedimentary basins were studied, using clay mineralogy and stable isotope (δ13C and δ18O) geochemistry, in order to investigate the Late Campanian Event. The clay fraction of the Campanian sediments from the Tercis-les-Bains section (Aquitaine Basin) and from the Poigny borehole (Paris Basin) is mainly composed of smectite. This background sedimentation was, however, interrupted during the Upper Campanian in the two basins by a substantial increase in detrital inputs, including illite, kaolinite, and chlorite at Tercis-les-Bains, and illite at Poigny. This detrital event, resulting from the enhanced erosion of nearby continental areas triggered by increasing runoff, has also been recognized in the Tethys and South Atlantic oceans. It coincided with a global negative carbon isotope excursion, the Late Campanian Event (LCE). Carbon isotope stratigraphy was used to correlate the two basins with previously studied sections from distant areas. Spectral analysis of the bulk δ13C from Tercis-les-Bains suggests a duration of ca. 400 kyr for a pre-LCE negative excursion and ca. 800–900 kyr for the LCE sensu stricto. The detrital event, as characterized by clay mineralogy, spans the interval that comprises the pre-LCE and the LCE, with a duration of 1.3 Myr. Intensification of continental erosion during the LCE may have resulted either from the Late Campanian polyplocum regression and/or from a regional tectonic pulse that triggered the emersion of previous submerged shelf areas and the increase of silicate erosion. As the LCE seems to be recorded at a large geographic scale, it is proposed here that enhanced chemical weathering and an associated decrease in atmospheric pCO2 levels could have contributed to the long-term Late Cretaceous cooling trend.
Matthieu Deville De Périère - One of the best experts on this subject based on the ideXlab platform.
-
The Santonian-Campanian Boundary Event (SCBE) in boreal basins: new geochemical and mineralogical data from the Northern Chalk Province (East Yorkshire, UK).
Cretaceous Research, 2019Co-Authors: Matthieu Deville De Périère, Pierre Pellenard, Nicolas ThibaultAbstract:The Upper Cretaceous Flamborough Chalk Formation of the English Northern Chalk Province (Danes Dyke section, East Yorkshire, UK) has been sampled for isotope analyses to test for the expression of the positive carbon-isotope excursion defining the Santonian–Campanian Boundary Event (SCBE) in northern England, and to improve basin-scale correlations between the Boreal and Tethyan realms. Clay mineral investigations have been conducted in order to characterise potential variations in the detrital flux between the top of the Santonian and the base of the Campanian, and to test relationships with the SCBE. In the Flamborough Chalk and in other chalk sections, the Santonian/Campanian boundary is defined by the highest occurrence datum of the crinoid Marsupites. Carbon isotope results in this section indicate the presence of the negative Foreness Event in the upper Santonian, while the SCBE is characterised by a double positive excursion with peaks respectively named ‘a’ and ‘b’. The first peak of the SCBE (a) lies in the uppermost part of the Marsupites Zone and therefore belongs to the upper Santonian. Peak b of the SCBE is located above the highest occurrence of Marsupites and is thus partially included in the Uintacrinus anglicus Zone of the lower Campanian. The clay fraction (
Silke Voigt - One of the best experts on this subject based on the ideXlab platform.
-
Integrated bio- and carbon-isotope stratigraphy of the Upper Cretaceous Gurpi Formation (Iran): a new reference for the eastern Tethys and its implications for large-scale correlation of stage boundaries.
Cretaceous Research, 2018Co-Authors: Mohammad J. Razmjooei, Nicolas Thibault, Anoshiravan Kani, Jaume Dinarès-turell, Emmanuelle Pucéat, Samira Shahriari, Wiesława Radmacher, Amir Mohammad Jamali, Clemens V. Ullmann, Silke VoigtAbstract:A high-resolution stratigraphic analysis of the Upper Cretaceous Gurpi Formation has been undertaken in the Shahneshin section (Zagros Basin, Iran). New results on calcareous nannofossils, planktic foraminifers, dinoflagellate cysts and high-resolution carbon and oxygen stable isotopes form the basis of a reference section for the eastern Tethys that spans the upper Coniacian to the late Danian. Carbon-isotope correlation to Gubbio, Italy and the NW German chalk allows for the identification of many isotopic events as well as for the definition of new events in the Campanian and Maastrichtian. Our results allow for a review of the accurate position of the Coniacian/Santonian, Santonian/Campanian, and Campanian/Maastrichtian stage boundaries relative to carbon isotopes and plankton bioevents. The reliability of Coniacian to Maastrichtian planktic foraminifer, dinoflagellate cysts and calcareous nannofossil biohorizons is assessed.