Sediment History of the Miocene-Pliocene Weddell Sea Abyssal Plain:
Old URL: https://wesscholar.wesleyan.edu/etd_mas_theses/15 In Copyright – Non-Commercial Use Permitted (InC-NC) To better understand the past stability of the Antarctic ice sheet, grain size and geochronology analyses were completed on Eocene to Early Pliocene samples from Ocean Drilling Program Sit...
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ftwesleyanu:oai:digitalcollections.wesleyan.edu:ir_2349 2023-05-15T13:59:40+02:00 Sediment History of the Miocene-Pliocene Weddell Sea Abyssal Plain: Schwarz, Stephen (Stephen Schwarz) (author) (Suzanne O'Connell) (Thesis advisor) () (Committee member) (Degree grantor) 129 pages electronic application/pdf https://doi.org/10.14418/wes01.2.15 https://digitalcollections.wesleyan.edu/islandora/object/ir%3A2349/datastream/TN/view/Sediment%20History%20of%20the%20Miocene-Pliocene%20Weddell%20Sea%20Abyssal%20Plain.jpg https://digitalcollections.wesleyan.edu/object/ir-2349 eng eng In Copyright – Non-Commercial Use Permitted (InC-NC) --- Text theses Dissertation/Thesis ftwesleyanu https://doi.org/10.14418/wes01.2.15 2022-02-04T20:43:42Z Old URL: https://wesscholar.wesleyan.edu/etd_mas_theses/15 In Copyright – Non-Commercial Use Permitted (InC-NC) To better understand the past stability of the Antarctic ice sheet, grain size and geochronology analyses were completed on Eocene to Early Pliocene samples from Ocean Drilling Program Sites 693, 694, and 696 within the Weddell Sea. These analyses are compared to similar studies from other areas of Antarctica, further illuminating the past ice sheet dynamics. The grain size analysis shows that the first glacial evidence occurred during the Lower Oligocene in the Eastern Weddell Sea and that the West Antarctic Ice Sheet had been fully formed by the Middle Miocene. The 40Ar/39Ar ages of detrital hornblendes and U-Pb ages of detrital zircons show shifting source areas for the Weddell Sea icebergs from the Middle Miocene to the Early Pliocene. These analyses lead to the conclusion that most of the ice rafted debris is sourced from East Antarctica, even after the formation of the West Antarctic Ice Sheet. There is also evidence for a destabilization event, similar to an event observed by previous studies (Williams et al., 2010), during the Late Miocene and Early Pliocene. Age provenance indicates that distant icebergs arrived and that there was a shift in the method of coarse material deposition from ice rafting to turbidites. Thesis Antarc* Antarctic Antarctica East Antarctica Ice Sheet Iceberg* Weddell Sea Wesleyan University: WesScholar Antarctic The Antarctic Weddell Sea East Antarctica West Antarctic Ice Sheet Weddell |
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Wesleyan University: WesScholar |
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--- Sediment History of the Miocene-Pliocene Weddell Sea Abyssal Plain: |
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description |
Old URL: https://wesscholar.wesleyan.edu/etd_mas_theses/15 In Copyright – Non-Commercial Use Permitted (InC-NC) To better understand the past stability of the Antarctic ice sheet, grain size and geochronology analyses were completed on Eocene to Early Pliocene samples from Ocean Drilling Program Sites 693, 694, and 696 within the Weddell Sea. These analyses are compared to similar studies from other areas of Antarctica, further illuminating the past ice sheet dynamics. The grain size analysis shows that the first glacial evidence occurred during the Lower Oligocene in the Eastern Weddell Sea and that the West Antarctic Ice Sheet had been fully formed by the Middle Miocene. The 40Ar/39Ar ages of detrital hornblendes and U-Pb ages of detrital zircons show shifting source areas for the Weddell Sea icebergs from the Middle Miocene to the Early Pliocene. These analyses lead to the conclusion that most of the ice rafted debris is sourced from East Antarctica, even after the formation of the West Antarctic Ice Sheet. There is also evidence for a destabilization event, similar to an event observed by previous studies (Williams et al., 2010), during the Late Miocene and Early Pliocene. Age provenance indicates that distant icebergs arrived and that there was a shift in the method of coarse material deposition from ice rafting to turbidites. |
author2 |
Schwarz, Stephen (Stephen Schwarz) (author) (Suzanne O'Connell) (Thesis advisor) () (Committee member) (Degree grantor) |
format |
Thesis |
title |
Sediment History of the Miocene-Pliocene Weddell Sea Abyssal Plain: |
title_short |
Sediment History of the Miocene-Pliocene Weddell Sea Abyssal Plain: |
title_full |
Sediment History of the Miocene-Pliocene Weddell Sea Abyssal Plain: |
title_fullStr |
Sediment History of the Miocene-Pliocene Weddell Sea Abyssal Plain: |
title_full_unstemmed |
Sediment History of the Miocene-Pliocene Weddell Sea Abyssal Plain: |
title_sort |
sediment history of the miocene-pliocene weddell sea abyssal plain: |
url |
https://doi.org/10.14418/wes01.2.15 https://digitalcollections.wesleyan.edu/islandora/object/ir%3A2349/datastream/TN/view/Sediment%20History%20of%20the%20Miocene-Pliocene%20Weddell%20Sea%20Abyssal%20Plain.jpg https://digitalcollections.wesleyan.edu/object/ir-2349 |
geographic |
Antarctic The Antarctic Weddell Sea East Antarctica West Antarctic Ice Sheet Weddell |
geographic_facet |
Antarctic The Antarctic Weddell Sea East Antarctica West Antarctic Ice Sheet Weddell |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Iceberg* Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Iceberg* Weddell Sea |
op_rights |
In Copyright – Non-Commercial Use Permitted (InC-NC) |
op_doi |
https://doi.org/10.14418/wes01.2.15 |
_version_ |
1766268338487427072 |