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Bruno Savoye - One of the best experts on this subject based on the ideXlab platform.
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the long term evolution of the congo deep sea Fan a basin wide view of the interaction between a giant Submarine Fan and a mature passive margin zaiango project
Tectonophysics, 2009Co-Authors: Zahie Anka, Michel Séranne, Michel Lopez, Magdalena Scheckwenderoth, Bruno SavoyeAbstract:Abstract We have integrated the relatively unknown distal domains of the Lower Congo basin, where the main depocenters of the Congo Submarine Fan are located, with the better-constrained successions on the shelf and upper slope, through the analysis of thousands of km of 2D seismic reflection profiles off-shore the Congo–Angola passive margin. The basin architecture is depicted by two ca. 800-km-long regional cross sections through the northern (Congo) and southern (Angola) margin. A large unit deposited basinward of the Aptian salt limit is likely to be the abyssal-plain equivalent of the upper-Cretaceous carbonate shelf that characterized the first post-rift deposits in West-equatorial African margins. A latest-Turonian shelf-deepening event is recorded in the abyssal plain as a long period (Coniacian–Eocene) of condensed sedimentation and basin starvation. The onset of the giant Tertiary Congo deep-sea Fan in early Oligocene following this event reactivates the abyssal plain as the main depocenter of the basin. The time–space partitioning of sedimentation within the deep-sea Fan results from the interplay among increasing sediment supply, margin uplift, rise of the Angola salt ridge, and canyon incision throughout the Neogene. Oligocene–early Miocene turbidite sedimentation occurs mainly in NW–SE grabens and ponded inter-diapir basins on the southern margin (Angola). Seaward tilting of the margin and downslope salt withdrawal activates the up-building of the Angola escarpment, which leads to a northward (Congo) shift of the transfer zones during late Miocene. Around the Miocene–Pliocene boundary, the incision of the Congo Submarine canyon confines the turbidite flows and drives a general basinward progradation of the Submarine Fan into the abyssal plain The slope deposition is dominated by fine-grained hemipelagic deposits ever since. Results from this work contribute to better understand the signature in the ultra-deep deposits of processes acting on the continental margin as well as the basin-wide sediment redistribution in areas of high river input.
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The long-term evolution of the Congo deep-sea Fan: A basin-wide view of the interaction between a giant Submarine Fan and a mature passive margin (ZaiAngo project)
Tectonophysics, 2009Co-Authors: Zahie Anka, Michel Séranne, Michel Lopez, Magdalena Scheck-wenderoth, Bruno SavoyeAbstract:We have integrated the relatively unknown distal domains of the Lower Congo basin, where the main depocenters of the Congo Submarine Fan are located, with the better-constrained successions on the shelf and upper slope, through the analysis of thousands of km of 2D seismic reflection profiles off-shore the Congo-Angola passive margin. The basin architecture is depicted by two ca. 800-km-long regional cross sections through the northern (Congo) and southern (Angola) margin. A large unit deposited basinward of the Aptian salt limit is likely to be the abyssal-plain equivalent of the upper-Cretaceous carbonate shelf that characterized the first post-rift deposits in West-equatorial African margins. A latest-Turonian shelf-deepening event is recorded in the abyssal plain as a long period (Coniacian-Eocene) of condensed sedimentation and basin starvation. The onset of the giant Tertiary Congo deep-sea Fan in early Oligocene following this event reactivates the abyssal plain as the main depocenter of the basin. The time-space partitioning of sedimentation within the deep-sea Fan results from the interplay among increasing sediment supply, margin uplift, rise of the Angola salt ridge, and canyon incision throughout the Neogene. Oligocene-early Miocene turbidite sedimentation occurs mainly in NW-SE grabens and ponded inter-diapir basins on the southern margin (Angola). Seaward tilting of the margin and downslope salt withdrawal activates the up-building of the Angola escarpment, which leads to a northward (Congo) shift of the transfer zones during late Miocene. Around the Miocene-Pliocene boundary, the incision of the Congo Submarine canyon confines the turbidite flows and drives a general basinward progradation of the Submarine Fan into the abyssal plain The slope deposition is dominated by fine-grained hemipelagic deposits ever since. Results from this work contribute to better understand the signature in the ultra-deep deposits of processes acting on the continental margin as well as the basin-wide sediment redistribution in areas of high river input. © 2008 Elsevier B.V. All rights reserved.
Niall C Slowey - One of the best experts on this subject based on the ideXlab platform.
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High Resolution, Millennial-Scale Patterns of Bed Compensation on a Sand-Rich Intraslope Submarine Fan, Western Niger Delta Slope
2018Co-Authors: Zane Richards Jobe, Nick C Howes, Zoltan Sylvester, Carlos Pirmez, Alessandro Cantelli, Matthew A Wolinsky, Andrew Parker, Ru Smith, Ciaran O'byrne, Niall C SloweyAbstract:Near-seafloor core and seismic-reflection data from the western Niger Delta continental slope document the facies, architecture, and evolution of Submarine channel and intraslope Submarine Fan deposits. The Submarine channel enters an 8 km long x 8 km wide intraslope basin, where more than 100 m of deposits form an intraslope Submarine Fan. Lobe deposits in the intraslope Submarine Fan show no significant downslope trend in sand presence or grain size, indicating that flows were bypassing sediment through the basin. This unique dataset indicates that intraslope lobe deposits may have more sand-rich facies near lobe edges than predicted by traditional lobe facies models, and that thickness patterns in intraslope Submarine Fans do not necessarily correlate with sand presence and/or quality.Core and radiocarbon age data indicate that sand beds progressively stack southward during the late Pleistocene, resulting in the compensation of at least two lobe elements. The youngest lobe element is well characterized by core data and is sand-rich, ~ 2 km wide x 6 km long, > 1 m thick, and was deposited rapidly over ca. 4,000 yr, from 18-14 ka. Sand beds forming an earlier lobe element were deposited on the northern part of the Fan from ca. 25 to 18 ka. Seafloor geomorphology and amplitudes from seismic reflection data confirm the location and age of these two compensating lobe elements. A third compensation event would have shifted sand deposition back to the northern part of the Fan, but sediment supply was interrupted by rapid sea level rise during Meltwater Pulse 1-A at ca. 14 ka, resulting in abandonment of the depositional system.
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high resolution millennial scale patterns of bed compensation on a sand rich intraslope Submarine Fan western niger delta slope
Geological Society of America Bulletin, 2017Co-Authors: Zane R Jobe, Zoltan Sylvester, Nick Howes, Carlos Pirmez, Andrew O Parker, Alessandro Cantelli, R D A Smith, Matthew A Wolinsky, Ciaran Obyrne, Niall C SloweyAbstract:Near-seafloor core and seismic reflection-data from the western Niger Delta continental slope document the facies, architecture, and evolution of Submarine channel and intraslope Submarine Fan deposits. The Submarine channel enters an 8-km-long by 8-km-wide intraslope basin, where more than 100 m of deposits form an intraslope Submarine Fan. Lobe deposits in the intraslope Submarine Fan show no significant downslope trend in sand presence or grain size, indicating that flows were bypassing sediment through the basin. This unique data set indicates that intraslope lobe deposits may have more sand-rich facies near lobe edges than predicted by traditional lobe facies models, and that thickness patterns in intraslope Submarine Fans do not necessarily correlate with sand presence and/or quality. Core and radiocarbon age data indicate that sand beds southward during the late Pleistocene, resulting in the compensation of at least two lobe elements. The youngest lobe element is well characterized by core data and is sand rich, ∼2 km wide × 6 km long, and >1 m thick and was deposited rapidly over ∼4000 yr, from 18 to 14 ka. Sand beds forming an earlier lobe element were deposited on the northern part of the Fan from ca. 25 to 18 ka. Seafloor geomorphology and amplitudes from seismic reflection data confirm the location and age of these two compensating lobe elements. A third compensation event would have shifted sand deposition back to the northern part of the Fan, but sediment supply was interrupted by rapid sea-level rise during Meltwater Pulse 1-A at ca. 14 ka, resulting in abandonment of the depositional system.
Zahie Anka - One of the best experts on this subject based on the ideXlab platform.
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the long term evolution of the congo deep sea Fan a basin wide view of the interaction between a giant Submarine Fan and a mature passive margin zaiango project
Tectonophysics, 2009Co-Authors: Zahie Anka, Michel Séranne, Michel Lopez, Magdalena Scheckwenderoth, Bruno SavoyeAbstract:Abstract We have integrated the relatively unknown distal domains of the Lower Congo basin, where the main depocenters of the Congo Submarine Fan are located, with the better-constrained successions on the shelf and upper slope, through the analysis of thousands of km of 2D seismic reflection profiles off-shore the Congo–Angola passive margin. The basin architecture is depicted by two ca. 800-km-long regional cross sections through the northern (Congo) and southern (Angola) margin. A large unit deposited basinward of the Aptian salt limit is likely to be the abyssal-plain equivalent of the upper-Cretaceous carbonate shelf that characterized the first post-rift deposits in West-equatorial African margins. A latest-Turonian shelf-deepening event is recorded in the abyssal plain as a long period (Coniacian–Eocene) of condensed sedimentation and basin starvation. The onset of the giant Tertiary Congo deep-sea Fan in early Oligocene following this event reactivates the abyssal plain as the main depocenter of the basin. The time–space partitioning of sedimentation within the deep-sea Fan results from the interplay among increasing sediment supply, margin uplift, rise of the Angola salt ridge, and canyon incision throughout the Neogene. Oligocene–early Miocene turbidite sedimentation occurs mainly in NW–SE grabens and ponded inter-diapir basins on the southern margin (Angola). Seaward tilting of the margin and downslope salt withdrawal activates the up-building of the Angola escarpment, which leads to a northward (Congo) shift of the transfer zones during late Miocene. Around the Miocene–Pliocene boundary, the incision of the Congo Submarine canyon confines the turbidite flows and drives a general basinward progradation of the Submarine Fan into the abyssal plain The slope deposition is dominated by fine-grained hemipelagic deposits ever since. Results from this work contribute to better understand the signature in the ultra-deep deposits of processes acting on the continental margin as well as the basin-wide sediment redistribution in areas of high river input.
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The long-term evolution of the Congo deep-sea Fan: A basin-wide view of the interaction between a giant Submarine Fan and a mature passive margin (ZaiAngo project)
Tectonophysics, 2009Co-Authors: Zahie Anka, Michel Séranne, Michel Lopez, Magdalena Scheck-wenderoth, Bruno SavoyeAbstract:We have integrated the relatively unknown distal domains of the Lower Congo basin, where the main depocenters of the Congo Submarine Fan are located, with the better-constrained successions on the shelf and upper slope, through the analysis of thousands of km of 2D seismic reflection profiles off-shore the Congo-Angola passive margin. The basin architecture is depicted by two ca. 800-km-long regional cross sections through the northern (Congo) and southern (Angola) margin. A large unit deposited basinward of the Aptian salt limit is likely to be the abyssal-plain equivalent of the upper-Cretaceous carbonate shelf that characterized the first post-rift deposits in West-equatorial African margins. A latest-Turonian shelf-deepening event is recorded in the abyssal plain as a long period (Coniacian-Eocene) of condensed sedimentation and basin starvation. The onset of the giant Tertiary Congo deep-sea Fan in early Oligocene following this event reactivates the abyssal plain as the main depocenter of the basin. The time-space partitioning of sedimentation within the deep-sea Fan results from the interplay among increasing sediment supply, margin uplift, rise of the Angola salt ridge, and canyon incision throughout the Neogene. Oligocene-early Miocene turbidite sedimentation occurs mainly in NW-SE grabens and ponded inter-diapir basins on the southern margin (Angola). Seaward tilting of the margin and downslope salt withdrawal activates the up-building of the Angola escarpment, which leads to a northward (Congo) shift of the transfer zones during late Miocene. Around the Miocene-Pliocene boundary, the incision of the Congo Submarine canyon confines the turbidite flows and drives a general basinward progradation of the Submarine Fan into the abyssal plain The slope deposition is dominated by fine-grained hemipelagic deposits ever since. Results from this work contribute to better understand the signature in the ultra-deep deposits of processes acting on the continental margin as well as the basin-wide sediment redistribution in areas of high river input. © 2008 Elsevier B.V. All rights reserved.
Marek Wendorff - One of the best experts on this subject based on the ideXlab platform.
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Carbonate cements and grains in Submarine Fan sandstones—the Cergowa Beds (Oligocene, Carpathians of Poland) recorded by cathodoluminescence
International Journal of Earth Sciences, 2017Co-Authors: Joanna Pszonka, Marek WendorffAbstract:© 2016, Springer-Verlag Berlin Heidelberg. The cathodoluminescence (CL) observations with cold cathode, supplemented by reconnaissance scanning electron microscope analyses, bring new data on petrology, provenance and diagenesis of the Oligocene-age Cergowa sandstones from the Outer Carpathians (SE Poland). The sandstones represent a variety of mass gravity flow sediments deposited on a Submarine Fan, which now forms a lenticular lithosome—a part of the Menilite Beds–Krosno Beds suite important for the hydrocarbons industry. The most common components of the Cergowa sandstones observed under the CL are carbonates—cement and grains that are mainly represented by lithoclasts. Carbonate cement is represented by five generations: brown (Cb), orange (Co), yellow (Cy), zoned (Cz) and black (Ck). Pore-filling Cb and Co calcite cements are interpreted as genetically related to eo- and mesodiagenetic phases. The mesodiagenetic phase is characterised by randomly distributed relatively large monocrystalline-zoned rhombs of dolomite cement (Cz) and ankerite/ferroan dolomite (Ck). The telodiagenetic phase is represented by pore-filling yellow calcite (Cy) that crystallised under the influence of suboxic meteoric waters. Lithoclasts represent six microfacies of carbonate rocks eroded in the source area, i.e. microbreccia, tectonised immature calcarenite/wacke, microsparite, sparite, biomicrosparite/packstone and dolostone. Pronounced indentations of terrigenous sand grains into intraclasts of packstone/biomicrosparite, coupled with commonly present similar packstone-type matrix, suggest that a significant part of matrix resulted from compaction of soft biomicrosparite grains. Terrigenous grains bound by calcite cement are commonly corroded by acidic diagenetic fluids, and partial or even complete replacement of silicates by calcite and clay minerals is illustrated here by feldspar grains. Substantial carbonate cementation has resulted in both the significant hardness and abrasion resistance of the Cergowa sandstones as well giving rise to their very low porosity and permeability.
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carbonate cements and grains in Submarine Fan sandstones the cergowa beds oligocene carpathians of poland recorded by cathodoluminescence
International Journal of Earth Sciences, 2017Co-Authors: Joanna Pszonka, Marek WendorffAbstract:The cathodoluminescence (CL) observations with cold cathode, supplemented by reconnaissance scanning electron microscope analyses, bring new data on petrology, provenance and diagenesis of the Oligocene-age Cergowa sandstones from the Outer Carpathians (SE Poland). The sandstones represent a variety of mass gravity flow sediments deposited on a Submarine Fan, which now forms a lenticular lithosome—a part of the Menilite Beds–Krosno Beds suite important for the hydrocarbons industry. The most common components of the Cergowa sandstones observed under the CL are carbonates—cement and grains that are mainly represented by lithoclasts. Carbonate cement is represented by five generations: brown (Cb), orange (Co), yellow (Cy), zoned (Cz) and black (Ck). Pore-filling Cb and Co calcite cements are interpreted as genetically related to eo- and mesodiagenetic phases. The mesodiagenetic phase is characterised by randomly distributed relatively large monocrystalline-zoned rhombs of dolomite cement (Cz) and ankerite/ferroan dolomite (Ck). The telodiagenetic phase is represented by pore-filling yellow calcite (Cy) that crystallised under the influence of suboxic meteoric waters. Lithoclasts represent six microfacies of carbonate rocks eroded in the source area, i.e. microbreccia, tectonised immature calcarenite/wacke, microsparite, sparite, biomicrosparite/packstone and dolostone. Pronounced indentations of terrigenous sand grains into intraclasts of packstone/biomicrosparite, coupled with commonly present similar packstone-type matrix, suggest that a significant part of matrix resulted from compaction of soft biomicrosparite grains. Terrigenous grains bound by calcite cement are commonly corroded by acidic diagenetic fluids, and partial or even complete replacement of silicates by calcite and clay minerals is illustrated here by feldspar grains. Substantial carbonate cementation has resulted in both the significant hardness and abrasion resistance of the Cergowa sandstones as well giving rise to their very low porosity and permeability.
Michel Séranne - One of the best experts on this subject based on the ideXlab platform.
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the long term evolution of the congo deep sea Fan a basin wide view of the interaction between a giant Submarine Fan and a mature passive margin zaiango project
Tectonophysics, 2009Co-Authors: Zahie Anka, Michel Séranne, Michel Lopez, Magdalena Scheckwenderoth, Bruno SavoyeAbstract:Abstract We have integrated the relatively unknown distal domains of the Lower Congo basin, where the main depocenters of the Congo Submarine Fan are located, with the better-constrained successions on the shelf and upper slope, through the analysis of thousands of km of 2D seismic reflection profiles off-shore the Congo–Angola passive margin. The basin architecture is depicted by two ca. 800-km-long regional cross sections through the northern (Congo) and southern (Angola) margin. A large unit deposited basinward of the Aptian salt limit is likely to be the abyssal-plain equivalent of the upper-Cretaceous carbonate shelf that characterized the first post-rift deposits in West-equatorial African margins. A latest-Turonian shelf-deepening event is recorded in the abyssal plain as a long period (Coniacian–Eocene) of condensed sedimentation and basin starvation. The onset of the giant Tertiary Congo deep-sea Fan in early Oligocene following this event reactivates the abyssal plain as the main depocenter of the basin. The time–space partitioning of sedimentation within the deep-sea Fan results from the interplay among increasing sediment supply, margin uplift, rise of the Angola salt ridge, and canyon incision throughout the Neogene. Oligocene–early Miocene turbidite sedimentation occurs mainly in NW–SE grabens and ponded inter-diapir basins on the southern margin (Angola). Seaward tilting of the margin and downslope salt withdrawal activates the up-building of the Angola escarpment, which leads to a northward (Congo) shift of the transfer zones during late Miocene. Around the Miocene–Pliocene boundary, the incision of the Congo Submarine canyon confines the turbidite flows and drives a general basinward progradation of the Submarine Fan into the abyssal plain The slope deposition is dominated by fine-grained hemipelagic deposits ever since. Results from this work contribute to better understand the signature in the ultra-deep deposits of processes acting on the continental margin as well as the basin-wide sediment redistribution in areas of high river input.
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The long-term evolution of the Congo deep-sea Fan: A basin-wide view of the interaction between a giant Submarine Fan and a mature passive margin (ZaiAngo project)
Tectonophysics, 2009Co-Authors: Zahie Anka, Michel Séranne, Michel Lopez, Magdalena Scheck-wenderoth, Bruno SavoyeAbstract:We have integrated the relatively unknown distal domains of the Lower Congo basin, where the main depocenters of the Congo Submarine Fan are located, with the better-constrained successions on the shelf and upper slope, through the analysis of thousands of km of 2D seismic reflection profiles off-shore the Congo-Angola passive margin. The basin architecture is depicted by two ca. 800-km-long regional cross sections through the northern (Congo) and southern (Angola) margin. A large unit deposited basinward of the Aptian salt limit is likely to be the abyssal-plain equivalent of the upper-Cretaceous carbonate shelf that characterized the first post-rift deposits in West-equatorial African margins. A latest-Turonian shelf-deepening event is recorded in the abyssal plain as a long period (Coniacian-Eocene) of condensed sedimentation and basin starvation. The onset of the giant Tertiary Congo deep-sea Fan in early Oligocene following this event reactivates the abyssal plain as the main depocenter of the basin. The time-space partitioning of sedimentation within the deep-sea Fan results from the interplay among increasing sediment supply, margin uplift, rise of the Angola salt ridge, and canyon incision throughout the Neogene. Oligocene-early Miocene turbidite sedimentation occurs mainly in NW-SE grabens and ponded inter-diapir basins on the southern margin (Angola). Seaward tilting of the margin and downslope salt withdrawal activates the up-building of the Angola escarpment, which leads to a northward (Congo) shift of the transfer zones during late Miocene. Around the Miocene-Pliocene boundary, the incision of the Congo Submarine canyon confines the turbidite flows and drives a general basinward progradation of the Submarine Fan into the abyssal plain The slope deposition is dominated by fine-grained hemipelagic deposits ever since. Results from this work contribute to better understand the signature in the ultra-deep deposits of processes acting on the continental margin as well as the basin-wide sediment redistribution in areas of high river input. © 2008 Elsevier B.V. All rights reserved.
