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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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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Victoria University of Wellington
2017
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ftvuwellington:oai:researcharchive.vuw.ac.nz:10063/6114 2023-08-15T12:37:55+02:00 Paleobiogeography of Eocene Radiolarians in the Southwest Pacific Pascher, Kristina Michaela McKay, Rob Hollis, Chris Cortese, Giuseppe 2017 http://researcharchive.vuw.ac.nz/handle/10063/6114 en_NZ eng Victoria University of Wellington http://researcharchive.vuw.ac.nz/handle/10063/6114 Eocene Radiolaria Southwest Pacific Text Doctoral 2017 ftvuwellington 2023-07-25T17:26:42Z 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 ... Doctoral or Postdoctoral Thesis Antarc* Antarctica Victoria University of Wellington: ResearchArchive Campbell Plateau ENVELOPE(171.000,171.000,-50.667,-50.667) New Zealand Pacific |
institution |
Open Polar |
collection |
Victoria University of Wellington: ResearchArchive |
op_collection_id |
ftvuwellington |
language |
English |
topic |
Eocene Radiolaria Southwest Pacific |
spellingShingle |
Eocene Radiolaria Southwest Pacific Pascher, Kristina Michaela Paleobiogeography of Eocene Radiolarians in the Southwest Pacific |
topic_facet |
Eocene Radiolaria Southwest Pacific |
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 ... |
author2 |
McKay, Rob Hollis, Chris Cortese, Giuseppe |
format |
Doctoral or Postdoctoral 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 |
publisher |
Victoria University of Wellington |
publishDate |
2017 |
url |
http://researcharchive.vuw.ac.nz/handle/10063/6114 |
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 |
http://researcharchive.vuw.ac.nz/handle/10063/6114 |
_version_ |
1774296923943993344 |