Cretaceous climate change evidenced in the Senegalese rock record, NW Africa
Climate change directly impacts the source, mode and volume of sediment generation which can be observed in the rock record. To accurately model source to sink systems, in addition to hinterland geology, tectonics and transport distance, a thorough comprehension of the climate is essential. In this...
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ftnerc:oai:nora.nerc.ac.uk:537198 2024-04-28T08:31:13+00:00 Cretaceous climate change evidenced in the Senegalese rock record, NW Africa Pearson, M. Casson, M. Millar, I. Charton, R. Redfern, J. 2024-03 http://nora.nerc.ac.uk/id/eprint/537198/ https://doi.org/10.1016/j.jafrearsci.2023.105166 unknown Elsevier Pearson, M.; Casson, M.; Millar, I.; Charton, R.; Redfern, J. 2024 Cretaceous climate change evidenced in the Senegalese rock record, NW Africa. Journal of African Earth Sciences, 211, 105166. https://doi.org/10.1016/j.jafrearsci.2023.105166 <https://doi.org/10.1016/j.jafrearsci.2023.105166> Publication - Article PeerReviewed 2024 ftnerc https://doi.org/10.1016/j.jafrearsci.2023.105166 2024-04-03T14:06:52Z Climate change directly impacts the source, mode and volume of sediment generation which can be observed in the rock record. To accurately model source to sink systems, in addition to hinterland geology, tectonics and transport distance, a thorough comprehension of the climate is essential. In this study we evaluate the role of climate on Cretaceous sediment delivery into the Senegal Basin, NW Africa, using data recorded from extensive sampling of basinal sediments. This is achieved through the mineralogical characterisation by X-ray diffraction and 146Nd/144Nd and 86Sr/88Sr isotopic analyses, which are correlated against existing, climate, tectonic and oceanographic models. Examples of climatic indicators include the change from predominantly smectitic deep marine basinal-clays recorded from the Cretaceous in DSDP wells 367 and 368 to clays with increased illite and kaolinite content, observed during the Albian and Cenomanian-Turonian, interpreted to be representative of higher humidity following the kaolinisation of hinterland source-rocks. Another climate indicator is the observation of palygorskite in deep-marine sediments, noted to be indicative of ocean anoxia related to the authigenesis of marine-smectite, a product of warm saline bottom waters and increased abundancy of silicon. The increase in salinity is interpreted to be a biproduct of elevated temperatures throughout the Cenomanian and increased denudation of the North Atlantic circumjacent continental evaporite-belts. Increase in silicon (biogenic) is related to a result of ocean-wide mass extinction of foraminifera during OAE2 triggered by the eruption of the Caribbean large igneous province. The results suggest that Cretaceous climate evolution of Senegal can be divided into four stages: 1. Berriasian-Barremian; an arid-period with monsoonal weather producing modest fluvial systems restricted to coastal regions. 2. Aptian-Albian; the establishment of a paleo-Intertropical Convergence Zone began to increase global temperature and humidity as ... Article in Journal/Newspaper North Atlantic Natural Environment Research Council: NERC Open Research Archive Journal of African Earth Sciences 211 105166 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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unknown |
description |
Climate change directly impacts the source, mode and volume of sediment generation which can be observed in the rock record. To accurately model source to sink systems, in addition to hinterland geology, tectonics and transport distance, a thorough comprehension of the climate is essential. In this study we evaluate the role of climate on Cretaceous sediment delivery into the Senegal Basin, NW Africa, using data recorded from extensive sampling of basinal sediments. This is achieved through the mineralogical characterisation by X-ray diffraction and 146Nd/144Nd and 86Sr/88Sr isotopic analyses, which are correlated against existing, climate, tectonic and oceanographic models. Examples of climatic indicators include the change from predominantly smectitic deep marine basinal-clays recorded from the Cretaceous in DSDP wells 367 and 368 to clays with increased illite and kaolinite content, observed during the Albian and Cenomanian-Turonian, interpreted to be representative of higher humidity following the kaolinisation of hinterland source-rocks. Another climate indicator is the observation of palygorskite in deep-marine sediments, noted to be indicative of ocean anoxia related to the authigenesis of marine-smectite, a product of warm saline bottom waters and increased abundancy of silicon. The increase in salinity is interpreted to be a biproduct of elevated temperatures throughout the Cenomanian and increased denudation of the North Atlantic circumjacent continental evaporite-belts. Increase in silicon (biogenic) is related to a result of ocean-wide mass extinction of foraminifera during OAE2 triggered by the eruption of the Caribbean large igneous province. The results suggest that Cretaceous climate evolution of Senegal can be divided into four stages: 1. Berriasian-Barremian; an arid-period with monsoonal weather producing modest fluvial systems restricted to coastal regions. 2. Aptian-Albian; the establishment of a paleo-Intertropical Convergence Zone began to increase global temperature and humidity as ... |
format |
Article in Journal/Newspaper |
author |
Pearson, M. Casson, M. Millar, I. Charton, R. Redfern, J. |
spellingShingle |
Pearson, M. Casson, M. Millar, I. Charton, R. Redfern, J. Cretaceous climate change evidenced in the Senegalese rock record, NW Africa |
author_facet |
Pearson, M. Casson, M. Millar, I. Charton, R. Redfern, J. |
author_sort |
Pearson, M. |
title |
Cretaceous climate change evidenced in the Senegalese rock record, NW Africa |
title_short |
Cretaceous climate change evidenced in the Senegalese rock record, NW Africa |
title_full |
Cretaceous climate change evidenced in the Senegalese rock record, NW Africa |
title_fullStr |
Cretaceous climate change evidenced in the Senegalese rock record, NW Africa |
title_full_unstemmed |
Cretaceous climate change evidenced in the Senegalese rock record, NW Africa |
title_sort |
cretaceous climate change evidenced in the senegalese rock record, nw africa |
publisher |
Elsevier |
publishDate |
2024 |
url |
http://nora.nerc.ac.uk/id/eprint/537198/ https://doi.org/10.1016/j.jafrearsci.2023.105166 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Pearson, M.; Casson, M.; Millar, I.; Charton, R.; Redfern, J. 2024 Cretaceous climate change evidenced in the Senegalese rock record, NW Africa. Journal of African Earth Sciences, 211, 105166. https://doi.org/10.1016/j.jafrearsci.2023.105166 <https://doi.org/10.1016/j.jafrearsci.2023.105166> |
op_doi |
https://doi.org/10.1016/j.jafrearsci.2023.105166 |
container_title |
Journal of African Earth Sciences |
container_volume |
211 |
container_start_page |
105166 |
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1797588832936263680 |