Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect
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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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.686707 2023-05-15T13:42:09+02:00 Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect Kurihara, Kenji Kennett, James P MEDIAN LATITUDE: -29.397440 * MEDIAN LONGITUDE: 163.142620 * SOUTH-BOUND LATITUDE: -32.012500 * WEST-BOUND LONGITUDE: 161.226700 * NORTH-BOUND LATITUDE: -26.111700 * EAST-BOUND LONGITUDE: 165.452500 * DATE/TIME START: 1971-11-30T00:00:00 * DATE/TIME END: 1982-12-19T00:00:00 1992-03-14 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.686707 https://doi.org/10.1594/PANGAEA.686707 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.686707 https://doi.org/10.1594/PANGAEA.686707 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY 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, https://doi.org/10.1016/0377-8398(92)90028-I 21-206 90-588_Site 90-590_Site 90-591_Site COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg21 Leg90 South Pacific/Tasman Sea/BASIN South Pacific/Tasman Sea/CONT RISE Dataset 1992 ftpangaea https://doi.org/10.1594/PANGAEA.686707 https://doi.org/10.1016/0377-8398(92)90028-I 2023-01-20T07:31:08Z 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. Dataset Antarc* Antarctic Ice Sheet PANGAEA - Data Publisher for Earth & Environmental Science Antarctic East Antarctic Ice Sheet Pacific ENVELOPE(161.226700,165.452500,-26.111700,-32.012500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
21-206 90-588_Site 90-590_Site 90-591_Site COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg21 Leg90 South Pacific/Tasman Sea/BASIN South Pacific/Tasman Sea/CONT RISE |
spellingShingle |
21-206 90-588_Site 90-590_Site 90-591_Site COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg21 Leg90 South Pacific/Tasman Sea/BASIN South Pacific/Tasman Sea/CONT RISE Kurihara, Kenji Kennett, James P Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect |
topic_facet |
21-206 90-588_Site 90-590_Site 90-591_Site COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg21 Leg90 South Pacific/Tasman Sea/BASIN South Pacific/Tasman Sea/CONT RISE |
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 |
Dataset |
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 |
title_short |
Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect |
title_full |
Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect |
title_fullStr |
Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect |
title_full_unstemmed |
Neogene benthic foraminiferal faunas of a southwest Pacific bathyal depth transect |
title_sort |
neogene benthic foraminiferal faunas of a southwest pacific bathyal depth transect |
publisher |
PANGAEA |
publishDate |
1992 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.686707 https://doi.org/10.1594/PANGAEA.686707 |
op_coverage |
MEDIAN LATITUDE: -29.397440 * MEDIAN LONGITUDE: 163.142620 * SOUTH-BOUND LATITUDE: -32.012500 * WEST-BOUND LONGITUDE: 161.226700 * NORTH-BOUND LATITUDE: -26.111700 * EAST-BOUND LONGITUDE: 165.452500 * DATE/TIME START: 1971-11-30T00:00:00 * DATE/TIME END: 1982-12-19T00:00:00 |
long_lat |
ENVELOPE(161.226700,165.452500,-26.111700,-32.012500) |
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: 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, https://doi.org/10.1016/0377-8398(92)90028-I |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.686707 https://doi.org/10.1594/PANGAEA.686707 |
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.686707 https://doi.org/10.1016/0377-8398(92)90028-I |
_version_ |
1766163306411720704 |