Carbon and oxygen isotopic compositions of Cibicidoides spp. and fine fraction separates (<10 µm) from ODP Holes 113-689B, 119-738B, and 120-748B
A prominent middle Eocene warming event is identified in Southern Ocean deep-sea cores, indicating that long-term cooling through the middle and late Eocene was not monotonic. At sites on Maud Rise and the Kerguelen Plateau, a distinct negative shift in d18O values (~1.0 per mil) is observed ca. 41....
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.713540 2024-09-15T18:18:42+00:00 Carbon and oxygen isotopic compositions of Cibicidoides spp. and fine fraction separates (<10 µm) from ODP Holes 113-689B, 119-738B, and 120-748B Bohaty, Steven M Zachos, James C MEDIAN LATITUDE: -61.725000 * MEDIAN LONGITUDE: 49.396760 * SOUTH-BOUND LATITUDE: -64.517000 * WEST-BOUND LONGITUDE: 3.099900 * NORTH-BOUND LATITUDE: -58.441000 * EAST-BOUND LONGITUDE: 82.787800 * DATE/TIME START: 1987-01-16T08:00:00 * DATE/TIME END: 1988-03-15T11:00:00 2003 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.713540 https://doi.org/10.1594/PANGAEA.713540 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.713540 https://doi.org/10.1594/PANGAEA.713540 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Bohaty, Steven M; Zachos, James C (2003): Significant Southern Ocean warming event in the late middle Eocene. Geology, 31(11), 1017-1020, https://doi.org/10.1130/G19800.1 113-689B 119-738B 120-748B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg113 Leg119 Leg120 Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean dataset publication series 2003 ftpangaea https://doi.org/10.1594/PANGAEA.71354010.1130/G19800.1 2024-07-24T02:31:42Z A prominent middle Eocene warming event is identified in Southern Ocean deep-sea cores, indicating that long-term cooling through the middle and late Eocene was not monotonic. At sites on Maud Rise and the Kerguelen Plateau, a distinct negative shift in d18O values (~1.0 per mil) is observed ca. 41.5 Ma. This excursion is interpreted as primarily a temperature signal, with a transient warming of 4°C over 600 k.y. affecting both surface and middle-bathyal deep waters in the Indian-Atlantic region of the Southern Ocean. This isotopic event is designated as the middle Eocene climatic optimum, and is interpreted to represent a significant climatic reversal in the midst of middle to late Eocene deep-sea cooling. The lack of a significant negative carbon isotope excursion, as observed during the Paleocene-Eocene thermal maximum, and the gradual rate of high-latitude warming suggest that this event was not triggered by methane hydrate dissociation. Rather, a transient rise in pCO2 levels is suspected, possibly as a result of metamorphic decarbonation in the Himalayan orogen or increased ridge/arc volcanism during the late middle Eocene. Other/Unknown Material Methane hydrate South Atlantic Ocean Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(3.099900,82.787800,-58.441000,-64.517000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
113-689B 119-738B 120-748B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg113 Leg119 Leg120 Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean |
spellingShingle |
113-689B 119-738B 120-748B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg113 Leg119 Leg120 Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean Bohaty, Steven M Zachos, James C Carbon and oxygen isotopic compositions of Cibicidoides spp. and fine fraction separates (<10 µm) from ODP Holes 113-689B, 119-738B, and 120-748B |
topic_facet |
113-689B 119-738B 120-748B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg113 Leg119 Leg120 Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean |
description |
A prominent middle Eocene warming event is identified in Southern Ocean deep-sea cores, indicating that long-term cooling through the middle and late Eocene was not monotonic. At sites on Maud Rise and the Kerguelen Plateau, a distinct negative shift in d18O values (~1.0 per mil) is observed ca. 41.5 Ma. This excursion is interpreted as primarily a temperature signal, with a transient warming of 4°C over 600 k.y. affecting both surface and middle-bathyal deep waters in the Indian-Atlantic region of the Southern Ocean. This isotopic event is designated as the middle Eocene climatic optimum, and is interpreted to represent a significant climatic reversal in the midst of middle to late Eocene deep-sea cooling. The lack of a significant negative carbon isotope excursion, as observed during the Paleocene-Eocene thermal maximum, and the gradual rate of high-latitude warming suggest that this event was not triggered by methane hydrate dissociation. Rather, a transient rise in pCO2 levels is suspected, possibly as a result of metamorphic decarbonation in the Himalayan orogen or increased ridge/arc volcanism during the late middle Eocene. |
format |
Other/Unknown Material |
author |
Bohaty, Steven M Zachos, James C |
author_facet |
Bohaty, Steven M Zachos, James C |
author_sort |
Bohaty, Steven M |
title |
Carbon and oxygen isotopic compositions of Cibicidoides spp. and fine fraction separates (<10 µm) from ODP Holes 113-689B, 119-738B, and 120-748B |
title_short |
Carbon and oxygen isotopic compositions of Cibicidoides spp. and fine fraction separates (<10 µm) from ODP Holes 113-689B, 119-738B, and 120-748B |
title_full |
Carbon and oxygen isotopic compositions of Cibicidoides spp. and fine fraction separates (<10 µm) from ODP Holes 113-689B, 119-738B, and 120-748B |
title_fullStr |
Carbon and oxygen isotopic compositions of Cibicidoides spp. and fine fraction separates (<10 µm) from ODP Holes 113-689B, 119-738B, and 120-748B |
title_full_unstemmed |
Carbon and oxygen isotopic compositions of Cibicidoides spp. and fine fraction separates (<10 µm) from ODP Holes 113-689B, 119-738B, and 120-748B |
title_sort |
carbon and oxygen isotopic compositions of cibicidoides spp. and fine fraction separates (<10 µm) from odp holes 113-689b, 119-738b, and 120-748b |
publisher |
PANGAEA |
publishDate |
2003 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.713540 https://doi.org/10.1594/PANGAEA.713540 |
op_coverage |
MEDIAN LATITUDE: -61.725000 * MEDIAN LONGITUDE: 49.396760 * SOUTH-BOUND LATITUDE: -64.517000 * WEST-BOUND LONGITUDE: 3.099900 * NORTH-BOUND LATITUDE: -58.441000 * EAST-BOUND LONGITUDE: 82.787800 * DATE/TIME START: 1987-01-16T08:00:00 * DATE/TIME END: 1988-03-15T11:00:00 |
long_lat |
ENVELOPE(3.099900,82.787800,-58.441000,-64.517000) |
genre |
Methane hydrate South Atlantic Ocean Southern Ocean |
genre_facet |
Methane hydrate South Atlantic Ocean Southern Ocean |
op_source |
Supplement to: Bohaty, Steven M; Zachos, James C (2003): Significant Southern Ocean warming event in the late middle Eocene. Geology, 31(11), 1017-1020, https://doi.org/10.1130/G19800.1 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.713540 https://doi.org/10.1594/PANGAEA.713540 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.71354010.1130/G19800.1 |
_version_ |
1810456776141701120 |