Sedimentary evidence of deglacial megafloods in the northern Gulf of Mexico (Pigmy Basin)
International audience Cored sediments from the Pigmy Basin, northern Gulf of Mexico, were analyzed in order to better constrain late deglacial and early Holocene paleoenvironmental and sedimentary changes in response to North American climate evolution. Mineralogical and geochemical proxies indicat...
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ftinsu:oai:HAL:hal-03280613v1 2024-02-11T10:04:52+01:00 Sedimentary evidence of deglacial megafloods in the northern Gulf of Mexico (Pigmy Basin) Montero-Serrano, Jean, Carlos Bout‑roumazeilles, Viviane Tribovillard, Nicolas Sionneau, Thomas Riboulleau, Armelle Bory, Aloys Flower, Benjamin Géosystèmes - UMR 8157 Université de Lille, Sciences et Technologies-Centre National de la Recherche Scientifique (CNRS) Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) University of South Florida Tampa (USF) 2009 https://hal.science/hal-03280613 https://hal.science/hal-03280613/document https://hal.science/hal-03280613/file/Montero%20et%20al_Deglaciation%20megafloods%20erosion%20GOM%20version1.pdf https://doi.org/10.1016/j.quascirev.2009.09.011 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2009.09.011 hal-03280613 https://hal.science/hal-03280613 https://hal.science/hal-03280613/document https://hal.science/hal-03280613/file/Montero%20et%20al_Deglaciation%20megafloods%20erosion%20GOM%20version1.pdf doi:10.1016/j.quascirev.2009.09.011 info:eu-repo/semantics/OpenAccess ISSN: 0277-3791 Quaternary Science Reviews https://hal.science/hal-03280613 Quaternary Science Reviews, 2009, 28 (27-28), pp.3333 - 3347. ⟨10.1016/j.quascirev.2009.09.011⟩ Gulf of Mexico Pigmy Basin Laurentide Ice Sheet deglaciation early Holocene meltwater floods Mississippi River [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2009 ftinsu https://doi.org/10.1016/j.quascirev.2009.09.011 2024-01-24T17:31:28Z International audience Cored sediments from the Pigmy Basin, northern Gulf of Mexico, were analyzed in order to better constrain late deglacial and early Holocene paleoenvironmental and sedimentary changes in response to North American climate evolution. Mineralogical and geochemical proxies indicate the succession of two sedimentary regimes: dominantly detrital during the deglaciation (15-12.9 cal ka BP) whereas biogenic contribution relatively increased later on during the Younger Dryas and early Holocene (12.9 and 10 cal ka BP). Geochemical data reveal that the deglacial record mainly reflects variations of terrigenous supply via the Mississippi River rather than modifications of redox conditions in the basin. Specific variations of almost all the parameters measured in this paper are synchronous with the main deglacial meltwater episode (Meltwater Spike) described or modeled in previous marine or continental studies. During this episode, most parameters display ''stair-step-like''-pattern variations highlighting three successive steps within the main meltwater flow. Variations in grain-size and clay mineral assemblage recorded in the Pigmy Basin indicate that the erosional regime was very strong on land during the first part of the Meltwater Spike, and then milder, inducing more subtle modifications in the sedimentary regime in this part of the Gulf. Specific geochemical and mineralogical signatures (notably, clay minerals and trace metal geochemistry) pinpoint a dominant origin from NW North America for detrital particles reflecting meltwater outflow from the southwestern Laurentide Ice Sheet (LIS) margin during the most intense freshwater discharge. The observed decrease of the sedimentation rate from about 200 to 25 cm/ka at ca 12.9 ka evidenced a drastic decrease of erosional processes during late phase of discharge, consistently with the hypotheses of major reduction of meltwater flow. The major modification at 12.9 cal ka BP is interpreted to result from both modifications of the main Mississippi ... Article in Journal/Newspaper Ice Sheet Institut national des sciences de l'Univers: HAL-INSU Quaternary Science Reviews 28 27-28 3333 3347 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Gulf of Mexico Pigmy Basin Laurentide Ice Sheet deglaciation early Holocene meltwater floods Mississippi River [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Gulf of Mexico Pigmy Basin Laurentide Ice Sheet deglaciation early Holocene meltwater floods Mississippi River [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Montero-Serrano, Jean, Carlos Bout‑roumazeilles, Viviane Tribovillard, Nicolas Sionneau, Thomas Riboulleau, Armelle Bory, Aloys Flower, Benjamin Sedimentary evidence of deglacial megafloods in the northern Gulf of Mexico (Pigmy Basin) |
topic_facet |
Gulf of Mexico Pigmy Basin Laurentide Ice Sheet deglaciation early Holocene meltwater floods Mississippi River [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Cored sediments from the Pigmy Basin, northern Gulf of Mexico, were analyzed in order to better constrain late deglacial and early Holocene paleoenvironmental and sedimentary changes in response to North American climate evolution. Mineralogical and geochemical proxies indicate the succession of two sedimentary regimes: dominantly detrital during the deglaciation (15-12.9 cal ka BP) whereas biogenic contribution relatively increased later on during the Younger Dryas and early Holocene (12.9 and 10 cal ka BP). Geochemical data reveal that the deglacial record mainly reflects variations of terrigenous supply via the Mississippi River rather than modifications of redox conditions in the basin. Specific variations of almost all the parameters measured in this paper are synchronous with the main deglacial meltwater episode (Meltwater Spike) described or modeled in previous marine or continental studies. During this episode, most parameters display ''stair-step-like''-pattern variations highlighting three successive steps within the main meltwater flow. Variations in grain-size and clay mineral assemblage recorded in the Pigmy Basin indicate that the erosional regime was very strong on land during the first part of the Meltwater Spike, and then milder, inducing more subtle modifications in the sedimentary regime in this part of the Gulf. Specific geochemical and mineralogical signatures (notably, clay minerals and trace metal geochemistry) pinpoint a dominant origin from NW North America for detrital particles reflecting meltwater outflow from the southwestern Laurentide Ice Sheet (LIS) margin during the most intense freshwater discharge. The observed decrease of the sedimentation rate from about 200 to 25 cm/ka at ca 12.9 ka evidenced a drastic decrease of erosional processes during late phase of discharge, consistently with the hypotheses of major reduction of meltwater flow. The major modification at 12.9 cal ka BP is interpreted to result from both modifications of the main Mississippi ... |
author2 |
Géosystèmes - UMR 8157 Université de Lille, Sciences et Technologies-Centre National de la Recherche Scientifique (CNRS) Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) University of South Florida Tampa (USF) |
format |
Article in Journal/Newspaper |
author |
Montero-Serrano, Jean, Carlos Bout‑roumazeilles, Viviane Tribovillard, Nicolas Sionneau, Thomas Riboulleau, Armelle Bory, Aloys Flower, Benjamin |
author_facet |
Montero-Serrano, Jean, Carlos Bout‑roumazeilles, Viviane Tribovillard, Nicolas Sionneau, Thomas Riboulleau, Armelle Bory, Aloys Flower, Benjamin |
author_sort |
Montero-Serrano, Jean, Carlos |
title |
Sedimentary evidence of deglacial megafloods in the northern Gulf of Mexico (Pigmy Basin) |
title_short |
Sedimentary evidence of deglacial megafloods in the northern Gulf of Mexico (Pigmy Basin) |
title_full |
Sedimentary evidence of deglacial megafloods in the northern Gulf of Mexico (Pigmy Basin) |
title_fullStr |
Sedimentary evidence of deglacial megafloods in the northern Gulf of Mexico (Pigmy Basin) |
title_full_unstemmed |
Sedimentary evidence of deglacial megafloods in the northern Gulf of Mexico (Pigmy Basin) |
title_sort |
sedimentary evidence of deglacial megafloods in the northern gulf of mexico (pigmy basin) |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-03280613 https://hal.science/hal-03280613/document https://hal.science/hal-03280613/file/Montero%20et%20al_Deglaciation%20megafloods%20erosion%20GOM%20version1.pdf https://doi.org/10.1016/j.quascirev.2009.09.011 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
ISSN: 0277-3791 Quaternary Science Reviews https://hal.science/hal-03280613 Quaternary Science Reviews, 2009, 28 (27-28), pp.3333 - 3347. ⟨10.1016/j.quascirev.2009.09.011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2009.09.011 hal-03280613 https://hal.science/hal-03280613 https://hal.science/hal-03280613/document https://hal.science/hal-03280613/file/Montero%20et%20al_Deglaciation%20megafloods%20erosion%20GOM%20version1.pdf doi:10.1016/j.quascirev.2009.09.011 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2009.09.011 |
container_title |
Quaternary Science Reviews |
container_volume |
28 |
container_issue |
27-28 |
container_start_page |
3333 |
op_container_end_page |
3347 |
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1790601617644453888 |