High-latitude sedimentation in response to climate variability during the Cenozoic
Here we investigate sedimentological responses to past climate change in shallow to deep marine depositional environments. Our primary study spans from the Late Pliocene to the Pleistocene (3.3 to 0.7 Ma), and features results from two International Ocean Discovery Program (IODP) Sites U1525 and U15...
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Virginia Tech
2024
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Online Access: | https://hdl.handle.net/10919/117300 |
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ftvirginiatec:oai:vtechworks.lib.vt.edu:10919/117300 2024-02-04T09:56:04+01:00 High-latitude sedimentation in response to climate variability during the Cenozoic Varela Valenzuela, Natalia Ines Geosciences Romans, Brian W. Eriksson, Kenneth A. Gill, Benjamin C. Dura, Cristina 2024-01-03 ETD application/pdf https://hdl.handle.net/10919/117300 en eng Virginia Tech vt_gsexam:39039 https://hdl.handle.net/10919/117300 In Copyright http://rightsstatements.org/vocab/InC/1.0/ sedimentology high-latitude sedimentation Antarctic Bottom Water submarine canyon deposition hydrothermal vent Pliocene Pleistocene Paleocene-Eocene climate change Dissertation 2024 ftvirginiatec 2024-01-11T19:04:10Z Here we investigate sedimentological responses to past climate change in shallow to deep marine depositional environments. Our primary study spans from the Late Pliocene to the Pleistocene (3.3 to 0.7 Ma), and features results from two International Ocean Discovery Program (IODP) Sites U1525 and U1524. Each of these sites is discussed in separate chapters here (Chapters 1 and 2). This interval experienced the change from the warming of the Late Pliocene, known as the Mid-Piacenzian Warming Period, to the Pleistocene cooling. This shift significantly impacted the expansion of the West Antarctic Ice Sheet, sea ice/polynya formation, and, notably, the genesis of Antarctic Bottom Water (AABW), a crucial component of the global thermohaline circulation. In Chapter 1, we propose that turbidite currents, arising from the formation of dense shelf water (DSW) in the Ross Sea (a precursor to AABW), leave a distinct record in the levees of Hillary Canyon. This canyon acts as a conduit, channeling DSW into the deep ocean and contributing to AABW production. By analyzing turbidite beds based on their frequency, thickness, and grain size, we gain insights into the historical occurrence and magnitude of these currents. Furthermore, we explore the influence of factors such as shelf availability and sea ice/polynya formation within the broader climate context of AABW formation. Chapter 2 shifts its focus to the sedimentological variability from shelf-to-slope along Hillary Canyon. This chapter examines the turbidite record associated with AABW formation within the shared timeframe (2.1 to 0.7 million years ago) between IODP Sites U1524 and U1525, and the impact of along slope currents and other processes in the sedimentary deposition and transport. The second study interval (Chapter 3), focuses on the regional sedimentological response proximal to a hydrothermal vent complex associated with the Paleocene-Eocene Thermal Maximum (PETM; ca. 56 Ma), a global warming event during which thousands of Gt C was released into the ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Ice Sheet Ross Sea Sea ice VTechWorks (VirginiaTech) Antarctic Ross Sea West Antarctic Ice Sheet Hillary Canyon ENVELOPE(-175.762,-175.762,-74.544,-74.544) |
institution |
Open Polar |
collection |
VTechWorks (VirginiaTech) |
op_collection_id |
ftvirginiatec |
language |
English |
topic |
sedimentology high-latitude sedimentation Antarctic Bottom Water submarine canyon deposition hydrothermal vent Pliocene Pleistocene Paleocene-Eocene climate change |
spellingShingle |
sedimentology high-latitude sedimentation Antarctic Bottom Water submarine canyon deposition hydrothermal vent Pliocene Pleistocene Paleocene-Eocene climate change Varela Valenzuela, Natalia Ines High-latitude sedimentation in response to climate variability during the Cenozoic |
topic_facet |
sedimentology high-latitude sedimentation Antarctic Bottom Water submarine canyon deposition hydrothermal vent Pliocene Pleistocene Paleocene-Eocene climate change |
description |
Here we investigate sedimentological responses to past climate change in shallow to deep marine depositional environments. Our primary study spans from the Late Pliocene to the Pleistocene (3.3 to 0.7 Ma), and features results from two International Ocean Discovery Program (IODP) Sites U1525 and U1524. Each of these sites is discussed in separate chapters here (Chapters 1 and 2). This interval experienced the change from the warming of the Late Pliocene, known as the Mid-Piacenzian Warming Period, to the Pleistocene cooling. This shift significantly impacted the expansion of the West Antarctic Ice Sheet, sea ice/polynya formation, and, notably, the genesis of Antarctic Bottom Water (AABW), a crucial component of the global thermohaline circulation. In Chapter 1, we propose that turbidite currents, arising from the formation of dense shelf water (DSW) in the Ross Sea (a precursor to AABW), leave a distinct record in the levees of Hillary Canyon. This canyon acts as a conduit, channeling DSW into the deep ocean and contributing to AABW production. By analyzing turbidite beds based on their frequency, thickness, and grain size, we gain insights into the historical occurrence and magnitude of these currents. Furthermore, we explore the influence of factors such as shelf availability and sea ice/polynya formation within the broader climate context of AABW formation. Chapter 2 shifts its focus to the sedimentological variability from shelf-to-slope along Hillary Canyon. This chapter examines the turbidite record associated with AABW formation within the shared timeframe (2.1 to 0.7 million years ago) between IODP Sites U1524 and U1525, and the impact of along slope currents and other processes in the sedimentary deposition and transport. The second study interval (Chapter 3), focuses on the regional sedimentological response proximal to a hydrothermal vent complex associated with the Paleocene-Eocene Thermal Maximum (PETM; ca. 56 Ma), a global warming event during which thousands of Gt C was released into the ... |
author2 |
Geosciences Romans, Brian W. Eriksson, Kenneth A. Gill, Benjamin C. Dura, Cristina |
format |
Doctoral or Postdoctoral Thesis |
author |
Varela Valenzuela, Natalia Ines |
author_facet |
Varela Valenzuela, Natalia Ines |
author_sort |
Varela Valenzuela, Natalia Ines |
title |
High-latitude sedimentation in response to climate variability during the Cenozoic |
title_short |
High-latitude sedimentation in response to climate variability during the Cenozoic |
title_full |
High-latitude sedimentation in response to climate variability during the Cenozoic |
title_fullStr |
High-latitude sedimentation in response to climate variability during the Cenozoic |
title_full_unstemmed |
High-latitude sedimentation in response to climate variability during the Cenozoic |
title_sort |
high-latitude sedimentation in response to climate variability during the cenozoic |
publisher |
Virginia Tech |
publishDate |
2024 |
url |
https://hdl.handle.net/10919/117300 |
long_lat |
ENVELOPE(-175.762,-175.762,-74.544,-74.544) |
geographic |
Antarctic Ross Sea West Antarctic Ice Sheet Hillary Canyon |
geographic_facet |
Antarctic Ross Sea West Antarctic Ice Sheet Hillary Canyon |
genre |
Antarc* Antarctic Ice Sheet Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Ice Sheet Ross Sea Sea ice |
op_relation |
vt_gsexam:39039 https://hdl.handle.net/10919/117300 |
op_rights |
In Copyright http://rightsstatements.org/vocab/InC/1.0/ |
_version_ |
1789960457681895424 |