Characterization of Eocene-Oligocene Depocenters in Prydz Bay, East Antarctica : A Lithostratigraphic Correlation of ODP Sites 739, 742, and 1166
The Eocene-Oligocene transition (EOT) marked a profound shift in the Earth’s climate, as the global greenhouse o f the early Cenozoic gave way to ‘icehouse’ conditions, or a climatic regime influenced by the waxing and waning o f glacial ice. Antarctica was dramatically altered during this time; its...
Main Author: | |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Montclair State University Digital Commons
2014
|
Subjects: | |
Online Access: | https://digitalcommons.montclair.edu/etd/380 https://digitalcommons.montclair.edu/context/etd/article/1381/viewcontent/Ciarletta_Thesis_2014_Redacted.pdf |
id |
ftmontclairstuni:oai:digitalcommons.montclair.edu:etd-1381 |
---|---|
record_format |
openpolar |
spelling |
ftmontclairstuni:oai:digitalcommons.montclair.edu:etd-1381 2023-07-23T04:15:41+02:00 Characterization of Eocene-Oligocene Depocenters in Prydz Bay, East Antarctica : A Lithostratigraphic Correlation of ODP Sites 739, 742, and 1166 Ciarletta, Daniel James 2014-05-01T07:00:00Z application/pdf https://digitalcommons.montclair.edu/etd/380 https://digitalcommons.montclair.edu/context/etd/article/1381/viewcontent/Ciarletta_Thesis_2014_Redacted.pdf unknown Montclair State University Digital Commons https://digitalcommons.montclair.edu/etd/380 https://digitalcommons.montclair.edu/context/etd/article/1381/viewcontent/Ciarletta_Thesis_2014_Redacted.pdf Theses, Dissertations and Culminating Projects Earth Sciences Environmental Sciences text 2014 ftmontclairstuni 2023-07-03T21:55:16Z The Eocene-Oligocene transition (EOT) marked a profound shift in the Earth’s climate, as the global greenhouse o f the early Cenozoic gave way to ‘icehouse’ conditions, or a climatic regime influenced by the waxing and waning o f glacial ice. Antarctica was dramatically altered during this time; its formerly cool temperate ecosystems nearly obliterated by the first major episode o f continental glaciation. A record o f this transition appears to be partly preserved in approximately half a kilometer o f sediments recovered from three holes (at ODP Sites 739, 742, and 1166) bored in the continental margin at Prydz Bay, an embayment o f the East Antarctic coast. Until recently, these holes were never completely described with common nomenclature and analysis. This study re-evaluated these cores under a unified regime, using a laser particle sizer to generate matrix grain size distribution profiles for 253 samples collected from the combined sediment column. Additional analysis o f select samples was performed with a scanning electron microscope to classify grain textures, as well as ICP-OES to provide geochemical information. The results o f this study support stratigraphic relationships between the ODP sites that were previously only inferred through seismic acquisition. This provides a much more complete picture o f the sedimentation processes occurring through the EOT. Chemical and microtextural weathering signals also provide a new window into the environment o f Prydz Bay during the EOT. These signals seem to confirm hypotheses from previous researches that the site featured a cool/temperate environment with tidewater glacial systems in the late Eocene that transitioned into near polar glacier conditions dominated by ice sheet growth by the early Oligocene. Crucially, the results o f this investigation suggest that enhanced glaciation o f the Prydz Bay region was already occurring before the start o f the Oligocene, which suggests that an initial step down in global temperature during the late Eocene (proxied ... Text Antarc* Antarctic Antarctica East Antarctica Ice Sheet Prydz Bay Tidewater Montclair State University Digital Commons Antarctic East Antarctica Prydz Bay |
institution |
Open Polar |
collection |
Montclair State University Digital Commons |
op_collection_id |
ftmontclairstuni |
language |
unknown |
topic |
Earth Sciences Environmental Sciences |
spellingShingle |
Earth Sciences Environmental Sciences Ciarletta, Daniel James Characterization of Eocene-Oligocene Depocenters in Prydz Bay, East Antarctica : A Lithostratigraphic Correlation of ODP Sites 739, 742, and 1166 |
topic_facet |
Earth Sciences Environmental Sciences |
description |
The Eocene-Oligocene transition (EOT) marked a profound shift in the Earth’s climate, as the global greenhouse o f the early Cenozoic gave way to ‘icehouse’ conditions, or a climatic regime influenced by the waxing and waning o f glacial ice. Antarctica was dramatically altered during this time; its formerly cool temperate ecosystems nearly obliterated by the first major episode o f continental glaciation. A record o f this transition appears to be partly preserved in approximately half a kilometer o f sediments recovered from three holes (at ODP Sites 739, 742, and 1166) bored in the continental margin at Prydz Bay, an embayment o f the East Antarctic coast. Until recently, these holes were never completely described with common nomenclature and analysis. This study re-evaluated these cores under a unified regime, using a laser particle sizer to generate matrix grain size distribution profiles for 253 samples collected from the combined sediment column. Additional analysis o f select samples was performed with a scanning electron microscope to classify grain textures, as well as ICP-OES to provide geochemical information. The results o f this study support stratigraphic relationships between the ODP sites that were previously only inferred through seismic acquisition. This provides a much more complete picture o f the sedimentation processes occurring through the EOT. Chemical and microtextural weathering signals also provide a new window into the environment o f Prydz Bay during the EOT. These signals seem to confirm hypotheses from previous researches that the site featured a cool/temperate environment with tidewater glacial systems in the late Eocene that transitioned into near polar glacier conditions dominated by ice sheet growth by the early Oligocene. Crucially, the results o f this investigation suggest that enhanced glaciation o f the Prydz Bay region was already occurring before the start o f the Oligocene, which suggests that an initial step down in global temperature during the late Eocene (proxied ... |
format |
Text |
author |
Ciarletta, Daniel James |
author_facet |
Ciarletta, Daniel James |
author_sort |
Ciarletta, Daniel James |
title |
Characterization of Eocene-Oligocene Depocenters in Prydz Bay, East Antarctica : A Lithostratigraphic Correlation of ODP Sites 739, 742, and 1166 |
title_short |
Characterization of Eocene-Oligocene Depocenters in Prydz Bay, East Antarctica : A Lithostratigraphic Correlation of ODP Sites 739, 742, and 1166 |
title_full |
Characterization of Eocene-Oligocene Depocenters in Prydz Bay, East Antarctica : A Lithostratigraphic Correlation of ODP Sites 739, 742, and 1166 |
title_fullStr |
Characterization of Eocene-Oligocene Depocenters in Prydz Bay, East Antarctica : A Lithostratigraphic Correlation of ODP Sites 739, 742, and 1166 |
title_full_unstemmed |
Characterization of Eocene-Oligocene Depocenters in Prydz Bay, East Antarctica : A Lithostratigraphic Correlation of ODP Sites 739, 742, and 1166 |
title_sort |
characterization of eocene-oligocene depocenters in prydz bay, east antarctica : a lithostratigraphic correlation of odp sites 739, 742, and 1166 |
publisher |
Montclair State University Digital Commons |
publishDate |
2014 |
url |
https://digitalcommons.montclair.edu/etd/380 https://digitalcommons.montclair.edu/context/etd/article/1381/viewcontent/Ciarletta_Thesis_2014_Redacted.pdf |
geographic |
Antarctic East Antarctica Prydz Bay |
geographic_facet |
Antarctic East Antarctica Prydz Bay |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Prydz Bay Tidewater |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Prydz Bay Tidewater |
op_source |
Theses, Dissertations and Culminating Projects |
op_relation |
https://digitalcommons.montclair.edu/etd/380 https://digitalcommons.montclair.edu/context/etd/article/1381/viewcontent/Ciarletta_Thesis_2014_Redacted.pdf |
_version_ |
1772176604750938112 |