Structure of the Demerara passive-transform margin and associated sedimentary processes. Initial results from the IGUANES cruise
he IGUANES cruise took place in May 2013 on the R/V L'Atalante along the Demerara passive transform margin off French Guiana and Surinam. Seismic, multibeam and chirp acquisitions were made. Piston cores were collected for pore geochemistry and sedimentology. A mooring was deployed on the sea-b...
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ftarchimer:oai:archimer.ifremer.fr:53942 2023-05-15T17:13:51+02:00 Structure of the Demerara passive-transform margin and associated sedimentary processes. Initial results from the IGUANES cruise Loncke, L. Maillard, A. Basile, C. Roest, Walter Bayon, Germain Gaullier, V. Pattier, France Mercier De Lépinay, Marion Grall, Celine Droz, L. Marsset, Tania Giresse, P. Caprais, Jean-claude Cathalot, Cecile Graindorge, D. Heuret, A. Lebrun, J. F. Bermell, Sylvain Marcaillou, B. Sotin, C. Hebert, B. Patriat, Martin Bassetti, M. A. Tallobre, Cedric Buscail, R. Durrieu De Madron, X. Bourrin, F. 2016 application/pdf https://archimer.ifremer.fr/doc/00428/53942/55285.pdf https://doi.org/10.1144/SP431.7 https://archimer.ifremer.fr/doc/00428/53942/ eng eng https://archimer.ifremer.fr/doc/00428/53942/55285.pdf doi:10.1144/SP431.7 https://archimer.ifremer.fr/doc/00428/53942/ 2016 The Author(s). Published by The Geological Society of London. All rights reserved info:eu-repo/semantics/openAccess restricted use Transform Margins: Development, Controls and Petroleum Systems. 2016. M. Nemčok; S. Rybár; S. T. Sinha; S. A. Hermeston; L. Ledvényiová. DOI:10.1144/SP431, ISBN electronic:,978186239963. Geological Society of London Special Publications. Vol.431, pp.179-197 text Book section info:eu-repo/semantics/bookPart 2016 ftarchimer https://doi.org/10.1144/SP431.7 https://doi.org/10.1144/SP431 2022-02-22T23:50:59Z he IGUANES cruise took place in May 2013 on the R/V L'Atalante along the Demerara passive transform margin off French Guiana and Surinam. Seismic, multibeam and chirp acquisitions were made. Piston cores were collected for pore geochemistry and sedimentology. A mooring was deployed on the sea-bottom for 10 months (temperature, salinity, turbidity and current measurements). This new dataset highlights the lateral variability of the 350 km-long Guiana–Surinam transform margin due to the presence of a releasing bend between two transform segments. The adjacent Demerara Plateau is affected by a 350 km-long giant slide complex. This complex initiated in Cretaceous times and was regularly reactivated until recent times. Since the Miocene, contourite processes seem to be active due to the onset of the North Atlantic Deep Water (NADW) bottom current. A main NADW water vein flows towards SE, eroding slide headscarps and allowing the deposition of contourite drifts. Numerous depressions looking like comet tails or comet scours record this flow. Some of those were interpreted before the cruise as active pockmarks. Pore geochemistry and core analysis do not show any evidence of present-day gas seepage. Book Part NADW North Atlantic Deep Water North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Geological Society, London, Special Publications 431 1 179 197 |
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Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
he IGUANES cruise took place in May 2013 on the R/V L'Atalante along the Demerara passive transform margin off French Guiana and Surinam. Seismic, multibeam and chirp acquisitions were made. Piston cores were collected for pore geochemistry and sedimentology. A mooring was deployed on the sea-bottom for 10 months (temperature, salinity, turbidity and current measurements). This new dataset highlights the lateral variability of the 350 km-long Guiana–Surinam transform margin due to the presence of a releasing bend between two transform segments. The adjacent Demerara Plateau is affected by a 350 km-long giant slide complex. This complex initiated in Cretaceous times and was regularly reactivated until recent times. Since the Miocene, contourite processes seem to be active due to the onset of the North Atlantic Deep Water (NADW) bottom current. A main NADW water vein flows towards SE, eroding slide headscarps and allowing the deposition of contourite drifts. Numerous depressions looking like comet tails or comet scours record this flow. Some of those were interpreted before the cruise as active pockmarks. Pore geochemistry and core analysis do not show any evidence of present-day gas seepage. |
format |
Book Part |
author |
Loncke, L. Maillard, A. Basile, C. Roest, Walter Bayon, Germain Gaullier, V. Pattier, France Mercier De Lépinay, Marion Grall, Celine Droz, L. Marsset, Tania Giresse, P. Caprais, Jean-claude Cathalot, Cecile Graindorge, D. Heuret, A. Lebrun, J. F. Bermell, Sylvain Marcaillou, B. Sotin, C. Hebert, B. Patriat, Martin Bassetti, M. A. Tallobre, Cedric Buscail, R. Durrieu De Madron, X. Bourrin, F. |
spellingShingle |
Loncke, L. Maillard, A. Basile, C. Roest, Walter Bayon, Germain Gaullier, V. Pattier, France Mercier De Lépinay, Marion Grall, Celine Droz, L. Marsset, Tania Giresse, P. Caprais, Jean-claude Cathalot, Cecile Graindorge, D. Heuret, A. Lebrun, J. F. Bermell, Sylvain Marcaillou, B. Sotin, C. Hebert, B. Patriat, Martin Bassetti, M. A. Tallobre, Cedric Buscail, R. Durrieu De Madron, X. Bourrin, F. Structure of the Demerara passive-transform margin and associated sedimentary processes. Initial results from the IGUANES cruise |
author_facet |
Loncke, L. Maillard, A. Basile, C. Roest, Walter Bayon, Germain Gaullier, V. Pattier, France Mercier De Lépinay, Marion Grall, Celine Droz, L. Marsset, Tania Giresse, P. Caprais, Jean-claude Cathalot, Cecile Graindorge, D. Heuret, A. Lebrun, J. F. Bermell, Sylvain Marcaillou, B. Sotin, C. Hebert, B. Patriat, Martin Bassetti, M. A. Tallobre, Cedric Buscail, R. Durrieu De Madron, X. Bourrin, F. |
author_sort |
Loncke, L. |
title |
Structure of the Demerara passive-transform margin and associated sedimentary processes. Initial results from the IGUANES cruise |
title_short |
Structure of the Demerara passive-transform margin and associated sedimentary processes. Initial results from the IGUANES cruise |
title_full |
Structure of the Demerara passive-transform margin and associated sedimentary processes. Initial results from the IGUANES cruise |
title_fullStr |
Structure of the Demerara passive-transform margin and associated sedimentary processes. Initial results from the IGUANES cruise |
title_full_unstemmed |
Structure of the Demerara passive-transform margin and associated sedimentary processes. Initial results from the IGUANES cruise |
title_sort |
structure of the demerara passive-transform margin and associated sedimentary processes. initial results from the iguanes cruise |
publishDate |
2016 |
url |
https://archimer.ifremer.fr/doc/00428/53942/55285.pdf https://doi.org/10.1144/SP431.7 https://archimer.ifremer.fr/doc/00428/53942/ |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_source |
Transform Margins: Development, Controls and Petroleum Systems. 2016. M. Nemčok; S. Rybár; S. T. Sinha; S. A. Hermeston; L. Ledvényiová. DOI:10.1144/SP431, ISBN electronic:,978186239963. Geological Society of London Special Publications. Vol.431, pp.179-197 |
op_relation |
https://archimer.ifremer.fr/doc/00428/53942/55285.pdf doi:10.1144/SP431.7 https://archimer.ifremer.fr/doc/00428/53942/ |
op_rights |
2016 The Author(s). Published by The Geological Society of London. All rights reserved info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1144/SP431.7 https://doi.org/10.1144/SP431 |
container_title |
Geological Society, London, Special Publications |
container_volume |
431 |
container_issue |
1 |
container_start_page |
179 |
op_container_end_page |
197 |
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1766071039106744320 |