The early opening of the Equatorial Atlantic gateway and the evolution of Cretaceous peak warming
The Cretaceous opening of the Equatorial Atlantic gateway (EAG) is considered a driver of major changes in global oceanography, carbon cycling, and climate. However, the early stages of EAG opening are poorly understood. We present seawater Nd-isotope, bulk geochemical, and micropaleontological data...
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GSA (Geological Society of America)
2023
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ftoceanrep:oai:oceanrep.geomar.de:58335 2024-02-11T10:06:25+01:00 The early opening of the Equatorial Atlantic gateway and the evolution of Cretaceous peak warming Dummann, Wolf Hofmann, Peter Herrle, Jens O. Frank, Martin Wagner, Thomas 2023-03-15 text https://oceanrep.geomar.de/id/eprint/58335/ https://oceanrep.geomar.de/id/eprint/58335/13/g50842.1.pdf https://oceanrep.geomar.de/id/eprint/58335/2/G50842_SuppMat.pdf https://pubs.geoscienceworld.org/gsa/geology/article/51/5/476/620976/The-early-opening-of-the-Equatorial-Atlantic https://doi.org/10.1130/G50842.1 en eng GSA (Geological Society of America) https://oceanrep.geomar.de/id/eprint/58335/13/g50842.1.pdf https://oceanrep.geomar.de/id/eprint/58335/2/G50842_SuppMat.pdf Dummann, W., Hofmann, P., Herrle, J. O., Frank, M. and Wagner, T. (2023) The early opening of the Equatorial Atlantic gateway and the evolution of Cretaceous peak warming. Open Access Geology, 51 (5). pp. 476-480. DOI 10.1130/G50842.1 <https://doi.org/10.1130/G50842.1>. doi:10.1130/G50842.1 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2023 ftoceanrep https://doi.org/10.1130/G50842.1 2024-01-15T00:26:59Z The Cretaceous opening of the Equatorial Atlantic gateway (EAG) is considered a driver of major changes in global oceanography, carbon cycling, and climate. However, the early stages of EAG opening are poorly understood. We present seawater Nd-isotope, bulk geochemical, and micropaleontological data from two South Atlantic drill cores that constrain the onset of shallow (<500 m) and intermediate (<~1000 m) water mass exchange across the EAG to 113 Ma and 107 Ma, respectively. Deep water mass exchange (>2000 m) was enabled by at least ca. 100 Ma, as much as 10 m.y. earlier than previously estimated. In response to EAG opening, deep-water ventilation in the South Atlantic, North Atlantic, and Tethys basins intensified, thereby triggering basin-scale reductions in organic carbon burial. We propose that the consequent drop in carbon sequestration in concert with increased atmospheric CO2 fluxes from subduction zones acted as major amplifiers of global warming that culminated in peak greenhouse conditions during the mid-Cretaceous. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Geology 51 5 476 480 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The Cretaceous opening of the Equatorial Atlantic gateway (EAG) is considered a driver of major changes in global oceanography, carbon cycling, and climate. However, the early stages of EAG opening are poorly understood. We present seawater Nd-isotope, bulk geochemical, and micropaleontological data from two South Atlantic drill cores that constrain the onset of shallow (<500 m) and intermediate (<~1000 m) water mass exchange across the EAG to 113 Ma and 107 Ma, respectively. Deep water mass exchange (>2000 m) was enabled by at least ca. 100 Ma, as much as 10 m.y. earlier than previously estimated. In response to EAG opening, deep-water ventilation in the South Atlantic, North Atlantic, and Tethys basins intensified, thereby triggering basin-scale reductions in organic carbon burial. We propose that the consequent drop in carbon sequestration in concert with increased atmospheric CO2 fluxes from subduction zones acted as major amplifiers of global warming that culminated in peak greenhouse conditions during the mid-Cretaceous. |
format |
Article in Journal/Newspaper |
author |
Dummann, Wolf Hofmann, Peter Herrle, Jens O. Frank, Martin Wagner, Thomas |
spellingShingle |
Dummann, Wolf Hofmann, Peter Herrle, Jens O. Frank, Martin Wagner, Thomas The early opening of the Equatorial Atlantic gateway and the evolution of Cretaceous peak warming |
author_facet |
Dummann, Wolf Hofmann, Peter Herrle, Jens O. Frank, Martin Wagner, Thomas |
author_sort |
Dummann, Wolf |
title |
The early opening of the Equatorial Atlantic gateway and the evolution of Cretaceous peak warming |
title_short |
The early opening of the Equatorial Atlantic gateway and the evolution of Cretaceous peak warming |
title_full |
The early opening of the Equatorial Atlantic gateway and the evolution of Cretaceous peak warming |
title_fullStr |
The early opening of the Equatorial Atlantic gateway and the evolution of Cretaceous peak warming |
title_full_unstemmed |
The early opening of the Equatorial Atlantic gateway and the evolution of Cretaceous peak warming |
title_sort |
early opening of the equatorial atlantic gateway and the evolution of cretaceous peak warming |
publisher |
GSA (Geological Society of America) |
publishDate |
2023 |
url |
https://oceanrep.geomar.de/id/eprint/58335/ https://oceanrep.geomar.de/id/eprint/58335/13/g50842.1.pdf https://oceanrep.geomar.de/id/eprint/58335/2/G50842_SuppMat.pdf https://pubs.geoscienceworld.org/gsa/geology/article/51/5/476/620976/The-early-opening-of-the-Equatorial-Atlantic https://doi.org/10.1130/G50842.1 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/58335/13/g50842.1.pdf https://oceanrep.geomar.de/id/eprint/58335/2/G50842_SuppMat.pdf Dummann, W., Hofmann, P., Herrle, J. O., Frank, M. and Wagner, T. (2023) The early opening of the Equatorial Atlantic gateway and the evolution of Cretaceous peak warming. Open Access Geology, 51 (5). pp. 476-480. DOI 10.1130/G50842.1 <https://doi.org/10.1130/G50842.1>. doi:10.1130/G50842.1 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1130/G50842.1 |
container_title |
Geology |
container_volume |
51 |
container_issue |
5 |
container_start_page |
476 |
op_container_end_page |
480 |
_version_ |
1790604118156378112 |