Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific
The Late Miocene-Early Pliocene paleoclimatic history has been evaluated for a deep drilled sediment sequence at Deep Sea Drilling Project Site 281 and a shallow water marine sediment sequence at Blind River, New Zealand, both of which lay within the Subantarctic water mass during the Late Miocene....
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1981
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.688475 2023-05-15T13:42:09+02:00 Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific Loutit, Tom S MEDIAN LATITUDE: -17.838150 * MEDIAN LONGITUDE: 130.391400 * SOUTH-BOUND LATITUDE: -43.683300 * WEST-BOUND LONGITUDE: 86.282800 * NORTH-BOUND LATITUDE: 8.007000 * EAST-BOUND LONGITUDE: 174.500000 * DATE/TIME START: 1972-03-01T00:00:00 * DATE/TIME END: 1972-03-01T00:00:00 1981-03-20 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.688475 https://doi.org/10.1594/PANGAEA.688475 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.688475 https://doi.org/10.1594/PANGAEA.688475 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Loutit, Tom S (1981): Late Miocene paleoclimatology: Subantarctic water mass, Southwest Pacific. Marine Micropaleontology, 6(1), 1-27, https://doi.org/10.1016/0377-8398(81)90010-4 22-218 Blind_River Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger HAND Indian Ocean//FAN Leg22 New Zealand Sampling by hand Dataset 1981 ftpangaea https://doi.org/10.1594/PANGAEA.688475 https://doi.org/10.1016/0377-8398(81)90010-4 2023-01-20T07:31:08Z The Late Miocene-Early Pliocene paleoclimatic history has been evaluated for a deep drilled sediment sequence at Deep Sea Drilling Project Site 281 and a shallow water marine sediment sequence at Blind River, New Zealand, both of which lay within the Subantarctic water mass during the Late Miocene. A major, faunally determined, cooling event within the latest Miocene at Site 281 and Blind River coincides with oxygen isotopic changes in benthonic foraminiferal composition at DSDP Site 284 considered by Shackleton and Kennett (1975) to indicate a significant increase in Antarctic ice sheet volume. However, at Site 281 benthonic foraminiferal oxygen isotopic changes do not record such a large increase in Antarctic ice volume. It is possible that the critical interval is within an unsampled section (no recovery) in the latest Miocene. Two benthonic oxygen isotopic events in the Late Miocene (0.5 ‰ and 1 ‰ in the light direction) may be useful as time-stratigraphic markers. A permanent, negative, carbon isotopic shift at both Site 281 and Blind River allows precise correlations to be made between the two sections and to other sites in the Pacific region. Close interval sampling below the carbon shift at Site 281 revealed dramatic fluctuations in surface-water temperatures prior to a latest Miocene interval of refrigeration (Kapitean) and a strong pulse of dissolution between 6.6 and 6.2 +/- 0.1 m.y. which may be related to a fundamental geochemical change in the oceans at the time of the carbon shift (6.3-6.2 m.y.). No similar close interval sampling at Blind River was possible because of a lack of outcrop over the critical interval. Paleoclimatic histories from the two sections are very similar. Surface water temperatures and Antarctic ice-cap volume appear to have been relatively stable during the late Middle-early Late Miocene (early-late Tongaporutuan). By 6.4 m.y. cooler conditions prevailed at Site 281. Between 6.3 and 6.2 -+ 0.1 m.y. the carbon isotopic shift occurred followed, within 100,000 yr, by a distinct ... Dataset Antarc* Antarctic Ice cap Ice Sheet PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Shackleton Pacific Indian New Zealand Kennett ENVELOPE(-65.167,-65.167,-67.117,-67.117) ENVELOPE(86.282800,174.500000,8.007000,-43.683300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
22-218 Blind_River Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger HAND Indian Ocean//FAN Leg22 New Zealand Sampling by hand |
spellingShingle |
22-218 Blind_River Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger HAND Indian Ocean//FAN Leg22 New Zealand Sampling by hand Loutit, Tom S Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific |
topic_facet |
22-218 Blind_River Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger HAND Indian Ocean//FAN Leg22 New Zealand Sampling by hand |
description |
The Late Miocene-Early Pliocene paleoclimatic history has been evaluated for a deep drilled sediment sequence at Deep Sea Drilling Project Site 281 and a shallow water marine sediment sequence at Blind River, New Zealand, both of which lay within the Subantarctic water mass during the Late Miocene. A major, faunally determined, cooling event within the latest Miocene at Site 281 and Blind River coincides with oxygen isotopic changes in benthonic foraminiferal composition at DSDP Site 284 considered by Shackleton and Kennett (1975) to indicate a significant increase in Antarctic ice sheet volume. However, at Site 281 benthonic foraminiferal oxygen isotopic changes do not record such a large increase in Antarctic ice volume. It is possible that the critical interval is within an unsampled section (no recovery) in the latest Miocene. Two benthonic oxygen isotopic events in the Late Miocene (0.5 ‰ and 1 ‰ in the light direction) may be useful as time-stratigraphic markers. A permanent, negative, carbon isotopic shift at both Site 281 and Blind River allows precise correlations to be made between the two sections and to other sites in the Pacific region. Close interval sampling below the carbon shift at Site 281 revealed dramatic fluctuations in surface-water temperatures prior to a latest Miocene interval of refrigeration (Kapitean) and a strong pulse of dissolution between 6.6 and 6.2 +/- 0.1 m.y. which may be related to a fundamental geochemical change in the oceans at the time of the carbon shift (6.3-6.2 m.y.). No similar close interval sampling at Blind River was possible because of a lack of outcrop over the critical interval. Paleoclimatic histories from the two sections are very similar. Surface water temperatures and Antarctic ice-cap volume appear to have been relatively stable during the late Middle-early Late Miocene (early-late Tongaporutuan). By 6.4 m.y. cooler conditions prevailed at Site 281. Between 6.3 and 6.2 -+ 0.1 m.y. the carbon isotopic shift occurred followed, within 100,000 yr, by a distinct ... |
format |
Dataset |
author |
Loutit, Tom S |
author_facet |
Loutit, Tom S |
author_sort |
Loutit, Tom S |
title |
Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific |
title_short |
Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific |
title_full |
Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific |
title_fullStr |
Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific |
title_full_unstemmed |
Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific |
title_sort |
stable carbon and oxygen isotope ratios of late miocene and early pliocene foraminifera from the southwest pacific |
publisher |
PANGAEA |
publishDate |
1981 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.688475 https://doi.org/10.1594/PANGAEA.688475 |
op_coverage |
MEDIAN LATITUDE: -17.838150 * MEDIAN LONGITUDE: 130.391400 * SOUTH-BOUND LATITUDE: -43.683300 * WEST-BOUND LONGITUDE: 86.282800 * NORTH-BOUND LATITUDE: 8.007000 * EAST-BOUND LONGITUDE: 174.500000 * DATE/TIME START: 1972-03-01T00:00:00 * DATE/TIME END: 1972-03-01T00:00:00 |
long_lat |
ENVELOPE(-65.167,-65.167,-67.117,-67.117) ENVELOPE(86.282800,174.500000,8.007000,-43.683300) |
geographic |
Antarctic Shackleton Pacific Indian New Zealand Kennett |
geographic_facet |
Antarctic Shackleton Pacific Indian New Zealand Kennett |
genre |
Antarc* Antarctic Ice cap Ice Sheet |
genre_facet |
Antarc* Antarctic Ice cap Ice Sheet |
op_source |
Supplement to: Loutit, Tom S (1981): Late Miocene paleoclimatology: Subantarctic water mass, Southwest Pacific. Marine Micropaleontology, 6(1), 1-27, https://doi.org/10.1016/0377-8398(81)90010-4 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.688475 https://doi.org/10.1594/PANGAEA.688475 |
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.688475 https://doi.org/10.1016/0377-8398(81)90010-4 |
_version_ |
1766163310442446848 |