Water-mass evolution in the Cretaceous Western Interior Seaway of North America and equatorial Atlantic
The Late Cretaceous Epoch was characterized by major global perturbations in the carbon cycle, the most prominent occurring near the Cenomanian–Turonian (CT) transition marked by Oceanic Anoxic Event 2 (OAE-2) at 94.9–93.7 Ma. The Cretaceous Western Interior Seaway (KWIS) was one of several epiconti...
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ftdoajarticles:oai:doaj.org/article:90fb876267bd49e19bb9c7ac40adc95d 2023-05-15T18:25:49+02:00 Water-mass evolution in the Cretaceous Western Interior Seaway of North America and equatorial Atlantic J. S. Eldrett P. Dodsworth S. C. Bergman M. Wright D. Minisini 2017-07-01T00:00:00Z https://doi.org/10.5194/cp-13-855-2017 https://doaj.org/article/90fb876267bd49e19bb9c7ac40adc95d EN eng Copernicus Publications https://www.clim-past.net/13/855/2017/cp-13-855-2017.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-13-855-2017 1814-9324 1814-9332 https://doaj.org/article/90fb876267bd49e19bb9c7ac40adc95d Climate of the Past, Vol 13, Pp 855-878 (2017) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2017 ftdoajarticles https://doi.org/10.5194/cp-13-855-2017 2022-12-30T20:54:02Z The Late Cretaceous Epoch was characterized by major global perturbations in the carbon cycle, the most prominent occurring near the Cenomanian–Turonian (CT) transition marked by Oceanic Anoxic Event 2 (OAE-2) at 94.9–93.7 Ma. The Cretaceous Western Interior Seaway (KWIS) was one of several epicontinental seas in which a complex water-mass evolution was recorded in widespread sedimentary successions. This contribution integrates new data on the main components of organic matter, geochemistry, and stable isotopes along a north–south transect from the KWIS to the equatorial western Atlantic and Southern Ocean. In particular, cored sedimentary rocks from the Eagle Ford Group of west Texas (∼ 90–98 Ma) demonstrate subtle temporal and spatial variations in palaeoenvironmental conditions and provide an important geographic constraint for interpreting water-mass evolution. High-latitude (boreal–austral), equatorial Atlantic Tethyan and locally sourced Western Interior Seaway water masses are distinguished by distinct palynological assemblages and geochemical signatures. The northward migration of an equatorial Atlantic Tethyan water mass into the KWIS occurred during the early–middle Cenomanian (98–95 Ma) followed by a major re-organization during the latest Cenomanian–Turonian (95–94 Ma) as a full connection with a northerly boreal water mass was established during peak transgression. This oceanographic change promoted de-stratification of the water column and improved oxygenation throughout the KWIS and as far south as the Demerara Rise off Suriname. In addition, the recorded decline in redox-sensitive trace metals during the onset of OAE-2 likely reflects a genuine oxygenation event related to open water-mass exchange and may have been complicated by variable contribution of organic matter from different sources (e.g. refractory/terrigenous material), requiring further investigation. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Austral Climate of the Past 13 7 855 878 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 J. S. Eldrett P. Dodsworth S. C. Bergman M. Wright D. Minisini Water-mass evolution in the Cretaceous Western Interior Seaway of North America and equatorial Atlantic |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
The Late Cretaceous Epoch was characterized by major global perturbations in the carbon cycle, the most prominent occurring near the Cenomanian–Turonian (CT) transition marked by Oceanic Anoxic Event 2 (OAE-2) at 94.9–93.7 Ma. The Cretaceous Western Interior Seaway (KWIS) was one of several epicontinental seas in which a complex water-mass evolution was recorded in widespread sedimentary successions. This contribution integrates new data on the main components of organic matter, geochemistry, and stable isotopes along a north–south transect from the KWIS to the equatorial western Atlantic and Southern Ocean. In particular, cored sedimentary rocks from the Eagle Ford Group of west Texas (∼ 90–98 Ma) demonstrate subtle temporal and spatial variations in palaeoenvironmental conditions and provide an important geographic constraint for interpreting water-mass evolution. High-latitude (boreal–austral), equatorial Atlantic Tethyan and locally sourced Western Interior Seaway water masses are distinguished by distinct palynological assemblages and geochemical signatures. The northward migration of an equatorial Atlantic Tethyan water mass into the KWIS occurred during the early–middle Cenomanian (98–95 Ma) followed by a major re-organization during the latest Cenomanian–Turonian (95–94 Ma) as a full connection with a northerly boreal water mass was established during peak transgression. This oceanographic change promoted de-stratification of the water column and improved oxygenation throughout the KWIS and as far south as the Demerara Rise off Suriname. In addition, the recorded decline in redox-sensitive trace metals during the onset of OAE-2 likely reflects a genuine oxygenation event related to open water-mass exchange and may have been complicated by variable contribution of organic matter from different sources (e.g. refractory/terrigenous material), requiring further investigation. |
format |
Article in Journal/Newspaper |
author |
J. S. Eldrett P. Dodsworth S. C. Bergman M. Wright D. Minisini |
author_facet |
J. S. Eldrett P. Dodsworth S. C. Bergman M. Wright D. Minisini |
author_sort |
J. S. Eldrett |
title |
Water-mass evolution in the Cretaceous Western Interior Seaway of North America and equatorial Atlantic |
title_short |
Water-mass evolution in the Cretaceous Western Interior Seaway of North America and equatorial Atlantic |
title_full |
Water-mass evolution in the Cretaceous Western Interior Seaway of North America and equatorial Atlantic |
title_fullStr |
Water-mass evolution in the Cretaceous Western Interior Seaway of North America and equatorial Atlantic |
title_full_unstemmed |
Water-mass evolution in the Cretaceous Western Interior Seaway of North America and equatorial Atlantic |
title_sort |
water-mass evolution in the cretaceous western interior seaway of north america and equatorial atlantic |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/cp-13-855-2017 https://doaj.org/article/90fb876267bd49e19bb9c7ac40adc95d |
geographic |
Southern Ocean Austral |
geographic_facet |
Southern Ocean Austral |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Climate of the Past, Vol 13, Pp 855-878 (2017) |
op_relation |
https://www.clim-past.net/13/855/2017/cp-13-855-2017.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-13-855-2017 1814-9324 1814-9332 https://doaj.org/article/90fb876267bd49e19bb9c7ac40adc95d |
op_doi |
https://doi.org/10.5194/cp-13-855-2017 |
container_title |
Climate of the Past |
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13 |
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7 |
container_start_page |
855 |
op_container_end_page |
878 |
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1766207492407164928 |