Stable oxygen and carbon isotope of foraminifera from DSDP Leg 90 sites
High-resolution oxygen and carbon isotope stratigraphy is presented for Miocene to early Pliocene sequences at three DSDP sites from the Lord Howe Rise, southwest Pacific, at water depths ranging from 1,300 to 2,000 m. Site 588 is located in the warm subtropics (~26°S), whereas Sites 590 and 591 are...
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1986
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.729770 2023-05-15T13:42:09+02:00 Stable oxygen and carbon isotope of foraminifera from DSDP Leg 90 sites Kennett, James P MEDIAN LATITUDE: -29.621000 * MEDIAN LONGITUDE: 163.011300 * SOUTH-BOUND LATITUDE: -31.584300 * WEST-BOUND LONGITUDE: 161.226700 * NORTH-BOUND LATITUDE: -26.111700 * EAST-BOUND LONGITUDE: 164.448700 * DATE/TIME START: 1982-12-06T00:00:00 * DATE/TIME END: 1982-12-19T00:00:00 1986-12-04 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.729770 https://doi.org/10.1594/PANGAEA.729770 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.729770 https://doi.org/10.1594/PANGAEA.729770 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Kennett, James P (1986): Miocene to early Pliocene oxygen and carbon isotope stratigraphy in the Southwest Pacific, Deep Sea Drilling Project Leg 90. In: Kennett, JP; von der Borch, CC; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 90, 1383-1411, https://doi.org/10.2973/dsdp.proc.90.142.1986 90-588 90-588A 90-588C 90-590A 90-590B 90-591 90-591B Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg90 South Pacific/Tasman Sea/CONT RISE Dataset 1986 ftpangaea https://doi.org/10.1594/PANGAEA.729770 https://doi.org/10.2973/dsdp.proc.90.142.1986 2023-01-20T07:31:35Z High-resolution oxygen and carbon isotope stratigraphy is presented for Miocene to early Pliocene sequences at three DSDP sites from the Lord Howe Rise, southwest Pacific, at water depths ranging from 1,300 to 2,000 m. Site 588 is located in the warm subtropics (~26°S), whereas Sites 590 and 591 are positioned in transitional (northern temperate) water masses (~31°S). Benthic foraminiferal oxygen and carbon isotope analyses were conducted on all sites; planktonic foraminiferal isotope data were generated for Site 590 only. Sample resolution in these sequences is on the order of 50,000 yr. or better. The chronological framework employed in this study is based largely upon ages assigned to Neogene calcareous nannoplankton boundaries. The benthic oxygen isotope record exhibits several major features during the Neogene. During most of the early Miocene, delta18O values were relatively low, reaching minimum values in the late early Miocene (19.5 to 16.5 Ma), and recording the climax of Neogene warmth. This was followed by a major increase in benthic delta18O values between ~16.5 and 13.5 Ma, which is interpreted as representing major, permanent accumulation of the East Antarctic ice sheet and cooling of bottom waters. During the 3 m.y. 18O enrichment, surface waters at these middle latitudes warmed between 16 and 14.5 Ma. During the remainder of the middle and late Miocene, benthic delta18O values exhibit distinct fluctuations, but the average value remained unchanged. The isotopic data show two distinct episodes of climatic cooling close to the middle/late Miocene boundary. The earliest of these events occurred between 12.5 and 11.5 Ma in the latest middle Miocene. The second cooling event occurred from 11 to 9 Ma, and is marked by some of the highest delta18O values of the entire Miocene. This was followed by relative warmth during the middle part of the late Miocene. The latest Miocene and earliest Pliocene (6.2 to 4.5 Ma) were marked by relatively high delta18O values, indicating increased cooling and glaciation. ... Dataset Antarc* Antarctic Ice Sheet PANGAEA - Data Publisher for Earth & Environmental Science Antarctic East Antarctic Ice Sheet Pacific ENVELOPE(161.226700,164.448700,-26.111700,-31.584300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
90-588 90-588A 90-588C 90-590A 90-590B 90-591 90-591B Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg90 South Pacific/Tasman Sea/CONT RISE |
spellingShingle |
90-588 90-588A 90-588C 90-590A 90-590B 90-591 90-591B Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg90 South Pacific/Tasman Sea/CONT RISE Kennett, James P Stable oxygen and carbon isotope of foraminifera from DSDP Leg 90 sites |
topic_facet |
90-588 90-588A 90-588C 90-590A 90-590B 90-591 90-591B Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg90 South Pacific/Tasman Sea/CONT RISE |
description |
High-resolution oxygen and carbon isotope stratigraphy is presented for Miocene to early Pliocene sequences at three DSDP sites from the Lord Howe Rise, southwest Pacific, at water depths ranging from 1,300 to 2,000 m. Site 588 is located in the warm subtropics (~26°S), whereas Sites 590 and 591 are positioned in transitional (northern temperate) water masses (~31°S). Benthic foraminiferal oxygen and carbon isotope analyses were conducted on all sites; planktonic foraminiferal isotope data were generated for Site 590 only. Sample resolution in these sequences is on the order of 50,000 yr. or better. The chronological framework employed in this study is based largely upon ages assigned to Neogene calcareous nannoplankton boundaries. The benthic oxygen isotope record exhibits several major features during the Neogene. During most of the early Miocene, delta18O values were relatively low, reaching minimum values in the late early Miocene (19.5 to 16.5 Ma), and recording the climax of Neogene warmth. This was followed by a major increase in benthic delta18O values between ~16.5 and 13.5 Ma, which is interpreted as representing major, permanent accumulation of the East Antarctic ice sheet and cooling of bottom waters. During the 3 m.y. 18O enrichment, surface waters at these middle latitudes warmed between 16 and 14.5 Ma. During the remainder of the middle and late Miocene, benthic delta18O values exhibit distinct fluctuations, but the average value remained unchanged. The isotopic data show two distinct episodes of climatic cooling close to the middle/late Miocene boundary. The earliest of these events occurred between 12.5 and 11.5 Ma in the latest middle Miocene. The second cooling event occurred from 11 to 9 Ma, and is marked by some of the highest delta18O values of the entire Miocene. This was followed by relative warmth during the middle part of the late Miocene. The latest Miocene and earliest Pliocene (6.2 to 4.5 Ma) were marked by relatively high delta18O values, indicating increased cooling and glaciation. ... |
format |
Dataset |
author |
Kennett, James P |
author_facet |
Kennett, James P |
author_sort |
Kennett, James P |
title |
Stable oxygen and carbon isotope of foraminifera from DSDP Leg 90 sites |
title_short |
Stable oxygen and carbon isotope of foraminifera from DSDP Leg 90 sites |
title_full |
Stable oxygen and carbon isotope of foraminifera from DSDP Leg 90 sites |
title_fullStr |
Stable oxygen and carbon isotope of foraminifera from DSDP Leg 90 sites |
title_full_unstemmed |
Stable oxygen and carbon isotope of foraminifera from DSDP Leg 90 sites |
title_sort |
stable oxygen and carbon isotope of foraminifera from dsdp leg 90 sites |
publisher |
PANGAEA |
publishDate |
1986 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.729770 https://doi.org/10.1594/PANGAEA.729770 |
op_coverage |
MEDIAN LATITUDE: -29.621000 * MEDIAN LONGITUDE: 163.011300 * SOUTH-BOUND LATITUDE: -31.584300 * WEST-BOUND LONGITUDE: 161.226700 * NORTH-BOUND LATITUDE: -26.111700 * EAST-BOUND LONGITUDE: 164.448700 * DATE/TIME START: 1982-12-06T00:00:00 * DATE/TIME END: 1982-12-19T00:00:00 |
long_lat |
ENVELOPE(161.226700,164.448700,-26.111700,-31.584300) |
geographic |
Antarctic East Antarctic Ice Sheet Pacific |
geographic_facet |
Antarctic East Antarctic Ice Sheet Pacific |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Supplement to: Kennett, James P (1986): Miocene to early Pliocene oxygen and carbon isotope stratigraphy in the Southwest Pacific, Deep Sea Drilling Project Leg 90. In: Kennett, JP; von der Borch, CC; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 90, 1383-1411, https://doi.org/10.2973/dsdp.proc.90.142.1986 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.729770 https://doi.org/10.1594/PANGAEA.729770 |
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.729770 https://doi.org/10.2973/dsdp.proc.90.142.1986 |
_version_ |
1766163629562920960 |