Paleobiogeography of Eocene Radiolarians in the Southwest Pacific
This thesis investigates the effect of climatic and oceanographic changes on the distribution of fossil radiolarian assemblages from the early Eocene to early Oligocene (~56–30 Ma) in the Southwest Pacific. Radiolarian assemblages have been analysed from a series of archived cores collected by the D...
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ftvictoriauwfig:oai:figshare.com:article/17048348 2023-05-15T13:35:14+02:00 Paleobiogeography of Eocene Radiolarians in the Southwest Pacific Pascher, Kristina Michaela 2017-01-01T00:00:00Z https://doi.org/10.26686/wgtn.17048348.v1 https://figshare.com/articles/thesis/Paleobiogeography_of_Eocene_Radiolarians_in_the_Southwest_Pacific/17048348 unknown doi:10.26686/wgtn.17048348.v1 https://figshare.com/articles/thesis/Paleobiogeography_of_Eocene_Radiolarians_in_the_Southwest_Pacific/17048348 Author Retains Copyright Palaeontology (incl. Palynology) Eocene Radiolaria Southwest Pacific School: School of Geography Environment and Earth Sciences 040308 Palaeontology (incl. Palynology) 970104 Expanding Knowledge in the Earth Sciences Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy Text Thesis 2017 ftvictoriauwfig https://doi.org/10.26686/wgtn.17048348.v1 2021-11-25T00:04:36Z This thesis investigates the effect of climatic and oceanographic changes on the distribution of fossil radiolarian assemblages from the early Eocene to early Oligocene (~56–30 Ma) in the Southwest Pacific. Radiolarian assemblages have been analysed from a series of archived cores collected by the Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP). The selected cores form a latitudinal transect designed to investigate the ecological change associated with the transition from the warm ‘greenhouse’ climate of the Eocene into the cooler Oligocene, when continental-scale glaciation is believed to have intiated in Antarctica. High-latitude sites were sampled on the Campbell Plateau (DSDP Site 277), Tasman Rise (DSDP sites 280 and 281) and the Tasman Sea (DSDP Site 283 and ODP Site 1172), while mid-latitude sites were sampled both to the west of New Zealand (DSDP sites 207, 206, 592) and east of New Zealand (ODP Site 1123). New foraminifer oxygen (δ¹⁸O) and carbon (δ¹³C) stable isotope data from DSDP sites 277, 207 and 592 are presented and provide additional age control and insights in the climatic and oceanographic changes in the Southwest Pacific during the early Eocene to early Oligocene. This thesis contributes a comprehensive taxonomic review of Eocene radiolarian taxa with the intention of standardising nomenclature and to resolve synonymies. 213 out of 259 counting groups have been reviewed and assigned to species or subspecies level and 7 new species are yet to be described. All sites have been correlated to the Southern Hemisphere radiolarian zonation, from the upper Paleocene to upper Oligocene (RP6SH to RP17SH). Alternative datums for the base of RP10SH (LO of Artobotrys auriculaleporis) and the base of RP12SH (LO of Lophocyrtis longiventer) are proposed. The early Eocene climatic optimum (EECO, ~53–49 Ma) can be identified by a negative excursion in foraminiferal δ¹⁸O values at Site 207. The radiolarian assemblages at sites 207 (paleolatitude ~46°S) and 277 (paleolatitude ~55°S) during the ... Thesis Antarc* Antarctica Open Access Victoria University of Wellington / Te Herenga Waka Campbell Plateau ENVELOPE(171.000,171.000,-50.667,-50.667) New Zealand Pacific |
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Open Access Victoria University of Wellington / Te Herenga Waka |
op_collection_id |
ftvictoriauwfig |
language |
unknown |
topic |
Palaeontology (incl. Palynology) Eocene Radiolaria Southwest Pacific School: School of Geography Environment and Earth Sciences 040308 Palaeontology (incl. Palynology) 970104 Expanding Knowledge in the Earth Sciences Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy |
spellingShingle |
Palaeontology (incl. Palynology) Eocene Radiolaria Southwest Pacific School: School of Geography Environment and Earth Sciences 040308 Palaeontology (incl. Palynology) 970104 Expanding Knowledge in the Earth Sciences Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy Pascher, Kristina Michaela Paleobiogeography of Eocene Radiolarians in the Southwest Pacific |
topic_facet |
Palaeontology (incl. Palynology) Eocene Radiolaria Southwest Pacific School: School of Geography Environment and Earth Sciences 040308 Palaeontology (incl. Palynology) 970104 Expanding Knowledge in the Earth Sciences Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy |
description |
This thesis investigates the effect of climatic and oceanographic changes on the distribution of fossil radiolarian assemblages from the early Eocene to early Oligocene (~56–30 Ma) in the Southwest Pacific. Radiolarian assemblages have been analysed from a series of archived cores collected by the Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP). The selected cores form a latitudinal transect designed to investigate the ecological change associated with the transition from the warm ‘greenhouse’ climate of the Eocene into the cooler Oligocene, when continental-scale glaciation is believed to have intiated in Antarctica. High-latitude sites were sampled on the Campbell Plateau (DSDP Site 277), Tasman Rise (DSDP sites 280 and 281) and the Tasman Sea (DSDP Site 283 and ODP Site 1172), while mid-latitude sites were sampled both to the west of New Zealand (DSDP sites 207, 206, 592) and east of New Zealand (ODP Site 1123). New foraminifer oxygen (δ¹⁸O) and carbon (δ¹³C) stable isotope data from DSDP sites 277, 207 and 592 are presented and provide additional age control and insights in the climatic and oceanographic changes in the Southwest Pacific during the early Eocene to early Oligocene. This thesis contributes a comprehensive taxonomic review of Eocene radiolarian taxa with the intention of standardising nomenclature and to resolve synonymies. 213 out of 259 counting groups have been reviewed and assigned to species or subspecies level and 7 new species are yet to be described. All sites have been correlated to the Southern Hemisphere radiolarian zonation, from the upper Paleocene to upper Oligocene (RP6SH to RP17SH). Alternative datums for the base of RP10SH (LO of Artobotrys auriculaleporis) and the base of RP12SH (LO of Lophocyrtis longiventer) are proposed. The early Eocene climatic optimum (EECO, ~53–49 Ma) can be identified by a negative excursion in foraminiferal δ¹⁸O values at Site 207. The radiolarian assemblages at sites 207 (paleolatitude ~46°S) and 277 (paleolatitude ~55°S) during the ... |
format |
Thesis |
author |
Pascher, Kristina Michaela |
author_facet |
Pascher, Kristina Michaela |
author_sort |
Pascher, Kristina Michaela |
title |
Paleobiogeography of Eocene Radiolarians in the Southwest Pacific |
title_short |
Paleobiogeography of Eocene Radiolarians in the Southwest Pacific |
title_full |
Paleobiogeography of Eocene Radiolarians in the Southwest Pacific |
title_fullStr |
Paleobiogeography of Eocene Radiolarians in the Southwest Pacific |
title_full_unstemmed |
Paleobiogeography of Eocene Radiolarians in the Southwest Pacific |
title_sort |
paleobiogeography of eocene radiolarians in the southwest pacific |
publishDate |
2017 |
url |
https://doi.org/10.26686/wgtn.17048348.v1 https://figshare.com/articles/thesis/Paleobiogeography_of_Eocene_Radiolarians_in_the_Southwest_Pacific/17048348 |
long_lat |
ENVELOPE(171.000,171.000,-50.667,-50.667) |
geographic |
Campbell Plateau New Zealand Pacific |
geographic_facet |
Campbell Plateau New Zealand Pacific |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
doi:10.26686/wgtn.17048348.v1 https://figshare.com/articles/thesis/Paleobiogeography_of_Eocene_Radiolarians_in_the_Southwest_Pacific/17048348 |
op_rights |
Author Retains Copyright |
op_doi |
https://doi.org/10.26686/wgtn.17048348.v1 |
_version_ |
1766063314159271936 |