Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect, supplement to: Kurihara, Kenji; Kennett, James P (1992): Paleoceanographic significance of Neogene benthic foraminiferal changes in a southwest Pacific bathyal depth transect. Marine Micropaleontology, 19(3), 181-199
Temporal changes in benthic foraminiferal assemblages were quantitatively examined (> 63 µm fraction) in four southwest Pacific deep-sea Neogene sequences in a depth transect between approximately 1300 and 3200 m to assist in evaluating paleoeeanographic history. The most conspicuous changes in b...
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1992
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ftdatacite:10.1594/pangaea.686707 2023-05-15T13:38:30+02:00 Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect, supplement to: Kurihara, Kenji; Kennett, James P (1992): Paleoceanographic significance of Neogene benthic foraminiferal changes in a southwest Pacific bathyal depth transect. Marine Micropaleontology, 19(3), 181-199 Kurihara, Kenji Kennett, James P 1992 application/zip https://dx.doi.org/10.1594/pangaea.686707 https://doi.pangaea.de/10.1594/PANGAEA.686707 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/0377-8398(92)90028-i Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Drilling/drill rig Composite Core Leg21 Leg90 Glomar Challenger Deep Sea Drilling Project DSDP Collection article Supplementary Collection of Datasets 1992 ftdatacite https://doi.org/10.1594/pangaea.686707 https://doi.org/10.1016/0377-8398(92)90028-i 2021-11-05T12:55:41Z Temporal changes in benthic foraminiferal assemblages were quantitatively examined (> 63 µm fraction) in four southwest Pacific deep-sea Neogene sequences in a depth transect between approximately 1300 and 3200 m to assist in evaluating paleoeeanographic history. The most conspicuous changes in benthic foraminiferal assemblages occurred in association with paleoclimatic changes defined at least in part by oxygen isotopic changes. The largest, centered at ~15 Ma (early Middle Miocene), is represented by an increase in the relative frequencies of Epistominella exigua, which underwent a major upward depth migration at that time. This was contemporaneous with the well-known positive oxygen isotopic shift in the early Middle Miocene. In Sites 588 and 590, most of the increase in relative abundances of E. exigua occurred during the middle to later part of the ~80 shift, following major growth of the east Antarctic ice sheet. Later assemblage changes occurred at 8.5 and 6.5 Ma. These associations indicate that the benthic foraminiferal assemblages in this depth transect largely adjusted to changes in deep waters related to Antarctic cryospheric evolution. In general, the Neogene benthic foraminiferal assemblages in this region underwent little change during the last 23 million years. This faunal conservatism suggests that deep-sea environments underwent relatively little change in the southwest Pacific during much of the Neogene. Although paleoceanographic changes did occur, partly in response to highlatitude cryospheric evolution, these were not of sufficient magnitude to create major deep-sea faunal changes in this part of the ocean.The benthic foraminiferal assemblages are dominated by individuals smaller than 150 µm. Most taxonomic turnover occurred in the larger (> 150 µm) size fractions. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Antarctic East Antarctic Ice Sheet Pacific Kennett ENVELOPE(-65.167,-65.167,-67.117,-67.117) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Drilling/drill rig Composite Core Leg21 Leg90 Glomar Challenger Deep Sea Drilling Project DSDP |
spellingShingle |
Drilling/drill rig Composite Core Leg21 Leg90 Glomar Challenger Deep Sea Drilling Project DSDP Kurihara, Kenji Kennett, James P Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect, supplement to: Kurihara, Kenji; Kennett, James P (1992): Paleoceanographic significance of Neogene benthic foraminiferal changes in a southwest Pacific bathyal depth transect. Marine Micropaleontology, 19(3), 181-199 |
topic_facet |
Drilling/drill rig Composite Core Leg21 Leg90 Glomar Challenger Deep Sea Drilling Project DSDP |
description |
Temporal changes in benthic foraminiferal assemblages were quantitatively examined (> 63 µm fraction) in four southwest Pacific deep-sea Neogene sequences in a depth transect between approximately 1300 and 3200 m to assist in evaluating paleoeeanographic history. The most conspicuous changes in benthic foraminiferal assemblages occurred in association with paleoclimatic changes defined at least in part by oxygen isotopic changes. The largest, centered at ~15 Ma (early Middle Miocene), is represented by an increase in the relative frequencies of Epistominella exigua, which underwent a major upward depth migration at that time. This was contemporaneous with the well-known positive oxygen isotopic shift in the early Middle Miocene. In Sites 588 and 590, most of the increase in relative abundances of E. exigua occurred during the middle to later part of the ~80 shift, following major growth of the east Antarctic ice sheet. Later assemblage changes occurred at 8.5 and 6.5 Ma. These associations indicate that the benthic foraminiferal assemblages in this depth transect largely adjusted to changes in deep waters related to Antarctic cryospheric evolution. In general, the Neogene benthic foraminiferal assemblages in this region underwent little change during the last 23 million years. This faunal conservatism suggests that deep-sea environments underwent relatively little change in the southwest Pacific during much of the Neogene. Although paleoceanographic changes did occur, partly in response to highlatitude cryospheric evolution, these were not of sufficient magnitude to create major deep-sea faunal changes in this part of the ocean.The benthic foraminiferal assemblages are dominated by individuals smaller than 150 µm. Most taxonomic turnover occurred in the larger (> 150 µm) size fractions. |
format |
Article in Journal/Newspaper |
author |
Kurihara, Kenji Kennett, James P |
author_facet |
Kurihara, Kenji Kennett, James P |
author_sort |
Kurihara, Kenji |
title |
Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect, supplement to: Kurihara, Kenji; Kennett, James P (1992): Paleoceanographic significance of Neogene benthic foraminiferal changes in a southwest Pacific bathyal depth transect. Marine Micropaleontology, 19(3), 181-199 |
title_short |
Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect, supplement to: Kurihara, Kenji; Kennett, James P (1992): Paleoceanographic significance of Neogene benthic foraminiferal changes in a southwest Pacific bathyal depth transect. Marine Micropaleontology, 19(3), 181-199 |
title_full |
Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect, supplement to: Kurihara, Kenji; Kennett, James P (1992): Paleoceanographic significance of Neogene benthic foraminiferal changes in a southwest Pacific bathyal depth transect. Marine Micropaleontology, 19(3), 181-199 |
title_fullStr |
Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect, supplement to: Kurihara, Kenji; Kennett, James P (1992): Paleoceanographic significance of Neogene benthic foraminiferal changes in a southwest Pacific bathyal depth transect. Marine Micropaleontology, 19(3), 181-199 |
title_full_unstemmed |
Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect, supplement to: Kurihara, Kenji; Kennett, James P (1992): Paleoceanographic significance of Neogene benthic foraminiferal changes in a southwest Pacific bathyal depth transect. Marine Micropaleontology, 19(3), 181-199 |
title_sort |
neogene benthic foraminiferal faunas of a southwest pacific bathyal depth transect, supplement to: kurihara, kenji; kennett, james p (1992): paleoceanographic significance of neogene benthic foraminiferal changes in a southwest pacific bathyal depth transect. marine micropaleontology, 19(3), 181-199 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1992 |
url |
https://dx.doi.org/10.1594/pangaea.686707 https://doi.pangaea.de/10.1594/PANGAEA.686707 |
long_lat |
ENVELOPE(-65.167,-65.167,-67.117,-67.117) |
geographic |
Antarctic East Antarctic Ice Sheet Pacific Kennett |
geographic_facet |
Antarctic East Antarctic Ice Sheet Pacific Kennett |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
https://dx.doi.org/10.1016/0377-8398(92)90028-i |
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.686707 https://doi.org/10.1016/0377-8398(92)90028-i |
_version_ |
1766106846220779520 |