Stable oxygen isotope record and benthic foraminiferal abundances in Cretaceous sediments of Demerara Rise
During the mid-Cretaceous period, the global subsurface oceans were relatively warm, but the origins of the high temperatures are debated. One hypothesis suggests that high sea levels and the continental configuration allowed high-salinity waters in low-latitude epicontinental shelf seas to sink and...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.768341 2023-05-15T17:29:42+02:00 Stable oxygen isotope record and benthic foraminiferal abundances in Cretaceous sediments of Demerara Rise Friedrich, Oliver Erbacher, Jochen Moriya, Kazuyoshi Wilson, Paul A Kuhnert, Henning MEDIAN LATITUDE: 9.370458 * MEDIAN LONGITUDE: -54.662169 * SOUTH-BOUND LATITUDE: 9.265667 * WEST-BOUND LONGITUDE: -54.733050 * NORTH-BOUND LATITUDE: 9.433333 * EAST-BOUND LONGITUDE: -54.544033 * DATE/TIME START: 2003-01-22T00:00:00 * DATE/TIME END: 2003-02-12T00:00:00 2008-09-02 application/zip, 8 datasets https://doi.pangaea.de/10.1594/PANGAEA.768341 https://doi.org/10.1594/PANGAEA.768341 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.768341 https://doi.org/10.1594/PANGAEA.768341 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Friedrich, Oliver; Erbacher, Jochen; Moriya, Kazuyoshi; Wilson, Paul A; Kuhnert, Henning (2008): Warm saline intermediate waters in the Cretaceous tropical Atlantic Ocean. Nature Geoscience, 1(7), 453-457, https://doi.org/10.1038/ngeo217 207-1258 207-1260 COMPCORE Composite Core Joides Resolution Leg207 North Atlantic Ocean Ocean Drilling Program ODP Dataset 2008 ftpangaea https://doi.org/10.1594/PANGAEA.768341 https://doi.org/10.1038/ngeo217 2023-01-20T07:32:17Z During the mid-Cretaceous period, the global subsurface oceans were relatively warm, but the origins of the high temperatures are debated. One hypothesis suggests that high sea levels and the continental configuration allowed high-salinity waters in low-latitude epicontinental shelf seas to sink and form deep-water masses (Brass et al., 1982, doi:10.1038/296620a0; Arthur and Natland, 1979; Chamberlin, 1906). In another scenario, surface waters in high-latitude regions, the modern area of deep-water formation, were warmed through greenhouse forcing (Bice and Marotzke, 2001, doi:10.1029/2000JC000561), which then propagated through deep-water circulation. Here, we use oxygen isotopes and Mg/Ca ratios from benthic foraminifera to reconstruct intermediate-water conditions in the tropical proto-Atlantic Ocean from 97 to 92 Myr ago. According to our reconstruction, intermediate-water temperatures ranged between 20 and 25 °C, the warmest ever documented for depths of 500-1,000 m. Our record also reveals intervals of high-salinity conditions, which we suggest reflect an influx of saline water derived from epicontinental seas around the tropical proto-North Atlantic Ocean. Although derived from only one site, our data indicate the existence of warm, saline intermediate waters in this silled basin. This combination of warm saline intermediate waters and restricted palaeogeography probably acted as preconditioning factors for the prolonged period of anoxia and black-shale formation in the equatorial proto-North Atlantic Ocean during the Cretaceous period. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-54.733050,-54.544033,9.433333,9.265667) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
207-1258 207-1260 COMPCORE Composite Core Joides Resolution Leg207 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
207-1258 207-1260 COMPCORE Composite Core Joides Resolution Leg207 North Atlantic Ocean Ocean Drilling Program ODP Friedrich, Oliver Erbacher, Jochen Moriya, Kazuyoshi Wilson, Paul A Kuhnert, Henning Stable oxygen isotope record and benthic foraminiferal abundances in Cretaceous sediments of Demerara Rise |
topic_facet |
207-1258 207-1260 COMPCORE Composite Core Joides Resolution Leg207 North Atlantic Ocean Ocean Drilling Program ODP |
description |
During the mid-Cretaceous period, the global subsurface oceans were relatively warm, but the origins of the high temperatures are debated. One hypothesis suggests that high sea levels and the continental configuration allowed high-salinity waters in low-latitude epicontinental shelf seas to sink and form deep-water masses (Brass et al., 1982, doi:10.1038/296620a0; Arthur and Natland, 1979; Chamberlin, 1906). In another scenario, surface waters in high-latitude regions, the modern area of deep-water formation, were warmed through greenhouse forcing (Bice and Marotzke, 2001, doi:10.1029/2000JC000561), which then propagated through deep-water circulation. Here, we use oxygen isotopes and Mg/Ca ratios from benthic foraminifera to reconstruct intermediate-water conditions in the tropical proto-Atlantic Ocean from 97 to 92 Myr ago. According to our reconstruction, intermediate-water temperatures ranged between 20 and 25 °C, the warmest ever documented for depths of 500-1,000 m. Our record also reveals intervals of high-salinity conditions, which we suggest reflect an influx of saline water derived from epicontinental seas around the tropical proto-North Atlantic Ocean. Although derived from only one site, our data indicate the existence of warm, saline intermediate waters in this silled basin. This combination of warm saline intermediate waters and restricted palaeogeography probably acted as preconditioning factors for the prolonged period of anoxia and black-shale formation in the equatorial proto-North Atlantic Ocean during the Cretaceous period. |
format |
Dataset |
author |
Friedrich, Oliver Erbacher, Jochen Moriya, Kazuyoshi Wilson, Paul A Kuhnert, Henning |
author_facet |
Friedrich, Oliver Erbacher, Jochen Moriya, Kazuyoshi Wilson, Paul A Kuhnert, Henning |
author_sort |
Friedrich, Oliver |
title |
Stable oxygen isotope record and benthic foraminiferal abundances in Cretaceous sediments of Demerara Rise |
title_short |
Stable oxygen isotope record and benthic foraminiferal abundances in Cretaceous sediments of Demerara Rise |
title_full |
Stable oxygen isotope record and benthic foraminiferal abundances in Cretaceous sediments of Demerara Rise |
title_fullStr |
Stable oxygen isotope record and benthic foraminiferal abundances in Cretaceous sediments of Demerara Rise |
title_full_unstemmed |
Stable oxygen isotope record and benthic foraminiferal abundances in Cretaceous sediments of Demerara Rise |
title_sort |
stable oxygen isotope record and benthic foraminiferal abundances in cretaceous sediments of demerara rise |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.768341 https://doi.org/10.1594/PANGAEA.768341 |
op_coverage |
MEDIAN LATITUDE: 9.370458 * MEDIAN LONGITUDE: -54.662169 * SOUTH-BOUND LATITUDE: 9.265667 * WEST-BOUND LONGITUDE: -54.733050 * NORTH-BOUND LATITUDE: 9.433333 * EAST-BOUND LONGITUDE: -54.544033 * DATE/TIME START: 2003-01-22T00:00:00 * DATE/TIME END: 2003-02-12T00:00:00 |
long_lat |
ENVELOPE(-54.733050,-54.544033,9.433333,9.265667) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Friedrich, Oliver; Erbacher, Jochen; Moriya, Kazuyoshi; Wilson, Paul A; Kuhnert, Henning (2008): Warm saline intermediate waters in the Cretaceous tropical Atlantic Ocean. Nature Geoscience, 1(7), 453-457, https://doi.org/10.1038/ngeo217 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.768341 https://doi.org/10.1594/PANGAEA.768341 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.768341 https://doi.org/10.1038/ngeo217 |
_version_ |
1766124489844719616 |