Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific, supplement to: Loutit, Tom S (1981): Late Miocene paleoclimatology: Subantarctic water mass, Southwest Pacific. Marine Micropaleontology, 6(1), 1-27
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...
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ftdatacite:10.1594/pangaea.688475 2023-05-15T13:38:30+02:00 Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific, supplement to: Loutit, Tom S (1981): Late Miocene paleoclimatology: Subantarctic water mass, Southwest Pacific. Marine Micropaleontology, 6(1), 1-27 Loutit, Tom S 1981 application/zip https://dx.doi.org/10.1594/pangaea.688475 https://doi.pangaea.de/10.1594/PANGAEA.688475 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/0377-8398(81)90010-4 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Drilling/drill rig Sampling by hand Leg22 Glomar Challenger Deep Sea Drilling Project DSDP Collection article Supplementary Collection of Datasets 1981 ftdatacite https://doi.org/10.1594/pangaea.688475 https://doi.org/10.1016/0377-8398(81)90010-4 2021-11-05T12:55:41Z 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 shallowing of water depths at Blind River. The earliest Pliocene (Opoitian) is marked by increasing surface-water temperatures. Article in Journal/Newspaper Antarc* Antarctic Ice cap Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Antarctic Kennett ENVELOPE(-65.167,-65.167,-67.117,-67.117) New Zealand Pacific Shackleton |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Drilling/drill rig Sampling by hand Leg22 Glomar Challenger Deep Sea Drilling Project DSDP |
spellingShingle |
Drilling/drill rig Sampling by hand Leg22 Glomar Challenger Deep Sea Drilling Project DSDP Loutit, Tom S Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific, supplement to: Loutit, Tom S (1981): Late Miocene paleoclimatology: Subantarctic water mass, Southwest Pacific. Marine Micropaleontology, 6(1), 1-27 |
topic_facet |
Drilling/drill rig Sampling by hand Leg22 Glomar Challenger Deep Sea Drilling Project DSDP |
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 shallowing of water depths at Blind River. The earliest Pliocene (Opoitian) is marked by increasing surface-water temperatures. |
format |
Article in Journal/Newspaper |
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, supplement to: Loutit, Tom S (1981): Late Miocene paleoclimatology: Subantarctic water mass, Southwest Pacific. Marine Micropaleontology, 6(1), 1-27 |
title_short |
Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific, supplement to: Loutit, Tom S (1981): Late Miocene paleoclimatology: Subantarctic water mass, Southwest Pacific. Marine Micropaleontology, 6(1), 1-27 |
title_full |
Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific, supplement to: Loutit, Tom S (1981): Late Miocene paleoclimatology: Subantarctic water mass, Southwest Pacific. Marine Micropaleontology, 6(1), 1-27 |
title_fullStr |
Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific, supplement to: Loutit, Tom S (1981): Late Miocene paleoclimatology: Subantarctic water mass, Southwest Pacific. Marine Micropaleontology, 6(1), 1-27 |
title_full_unstemmed |
Stable carbon and oxygen isotope ratios of Late Miocene and Early Pliocene foraminifera from the Southwest Pacific, supplement to: Loutit, Tom S (1981): Late Miocene paleoclimatology: Subantarctic water mass, Southwest Pacific. Marine Micropaleontology, 6(1), 1-27 |
title_sort |
stable carbon and oxygen isotope ratios of late miocene and early pliocene foraminifera from the southwest pacific, supplement to: loutit, tom s (1981): late miocene paleoclimatology: subantarctic water mass, southwest pacific. marine micropaleontology, 6(1), 1-27 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1981 |
url |
https://dx.doi.org/10.1594/pangaea.688475 https://doi.pangaea.de/10.1594/PANGAEA.688475 |
long_lat |
ENVELOPE(-65.167,-65.167,-67.117,-67.117) |
geographic |
Antarctic Kennett New Zealand Pacific Shackleton |
geographic_facet |
Antarctic Kennett New Zealand Pacific Shackleton |
genre |
Antarc* Antarctic Ice cap Ice Sheet |
genre_facet |
Antarc* Antarctic Ice cap Ice Sheet |
op_relation |
https://dx.doi.org/10.1016/0377-8398(81)90010-4 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.688475 https://doi.org/10.1016/0377-8398(81)90010-4 |
_version_ |
1766106848365117440 |