From Bedrock to Sediments: Insights on the Ross Sea Ice-Flow Dynamics Inferred from Detrital Data
The Ross Sea received about one third of the Antarctic ice. It is a crucial area to investigate the ice dynamics during the Cenozoic as it records the evolution of both the East Antarctic Ice Sheet (EAIS) and West Antarctic Ice Sheet (WAIS), whose variations are a direct response to climate change....
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ftunivpadovairis:oai:www.research.unipd.it:11577/3423168 2024-04-14T08:04:13+00:00 From Bedrock to Sediments: Insights on the Ross Sea Ice-Flow Dynamics Inferred from Detrital Data Li, Xia Li, Xia Zattin, Massimiliano Agnini, Claudia 2019-12-01 http://hdl.handle.net/11577/3423168 eng eng Università degli studi di Padova http://hdl.handle.net/11577/3423168 info:eu-repo/semantics/openAccess Ross Sea Detrital Thermochronology LGM Settore GEO/12 - Oceanografia e Fisica dell'Atmosfera info:eu-repo/semantics/doctoralThesis 2019 ftunivpadovairis 2024-03-21T20:04:42Z The Ross Sea received about one third of the Antarctic ice. It is a crucial area to investigate the ice dynamics during the Cenozoic as it records the evolution of both the East Antarctic Ice Sheet (EAIS) and West Antarctic Ice Sheet (WAIS), whose variations are a direct response to climate change. Reconstructions of the ice flow models are mainly based on multi-proxy provenance analysis of glacigenic sediments but so far, a well-established model is not existing. There are still disputes of the different ice contribution between the EAIS and the WAIS, and the ice confluence in the Ross Sea. Thus, the main target of this study is to provide new inputs to build a robust model of Ross Sea ice flow during the Cenozoic. This work is based on 48 samples collected across the Ross Sea and analyzed by apatite fission track (AFT) dating. More in detail, a first set of 16 samples is from the drilling core CIROS-2, whose stratigraphic range is from early Pliocene to Quaternary. A second group of 32 samples derives from 18 post-Late Glacial Maximum (LGM) piston cores drilled across the Ross Sea. The obtained fission-track data have been modelled with statistical tools (among them, the Multidimensional Scaling) and finally interpreted in terms of thermal evolution by the HeFTy software. The AFT age data of CIROS-2 samples show a large range of ages but most of the grains fit well with two main age components at 24-42 Ma and 43-70 Ma whereas the other components are not regularly distributed through the well. This pattern indicates a mixture of provenance from different areas along the Transantarctic Mountains (TAM). Furthermore, it suggests glacial expansion over the McMurdo Sound during the Pliocene, and periodically ice invading and retreating in Pleistocene. The data of post-LGM piston cores samples also show a large range of individual grain ages. The lack of systematic trends across the Ross Sea indicates the presence of multiple sources with a complex and differentiated erosional history. The presence of apatites ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Ice Sheet McMurdo Sound Ross Sea Sea ice Padua Research Archive (IRIS - Università degli Studi di Padova) Antarctic The Antarctic Ross Sea West Antarctic Ice Sheet McMurdo Sound East Antarctic Ice Sheet Transantarctic Mountains |
institution |
Open Polar |
collection |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
op_collection_id |
ftunivpadovairis |
language |
English |
topic |
Ross Sea Detrital Thermochronology LGM Settore GEO/12 - Oceanografia e Fisica dell'Atmosfera |
spellingShingle |
Ross Sea Detrital Thermochronology LGM Settore GEO/12 - Oceanografia e Fisica dell'Atmosfera Li, Xia From Bedrock to Sediments: Insights on the Ross Sea Ice-Flow Dynamics Inferred from Detrital Data |
topic_facet |
Ross Sea Detrital Thermochronology LGM Settore GEO/12 - Oceanografia e Fisica dell'Atmosfera |
description |
The Ross Sea received about one third of the Antarctic ice. It is a crucial area to investigate the ice dynamics during the Cenozoic as it records the evolution of both the East Antarctic Ice Sheet (EAIS) and West Antarctic Ice Sheet (WAIS), whose variations are a direct response to climate change. Reconstructions of the ice flow models are mainly based on multi-proxy provenance analysis of glacigenic sediments but so far, a well-established model is not existing. There are still disputes of the different ice contribution between the EAIS and the WAIS, and the ice confluence in the Ross Sea. Thus, the main target of this study is to provide new inputs to build a robust model of Ross Sea ice flow during the Cenozoic. This work is based on 48 samples collected across the Ross Sea and analyzed by apatite fission track (AFT) dating. More in detail, a first set of 16 samples is from the drilling core CIROS-2, whose stratigraphic range is from early Pliocene to Quaternary. A second group of 32 samples derives from 18 post-Late Glacial Maximum (LGM) piston cores drilled across the Ross Sea. The obtained fission-track data have been modelled with statistical tools (among them, the Multidimensional Scaling) and finally interpreted in terms of thermal evolution by the HeFTy software. The AFT age data of CIROS-2 samples show a large range of ages but most of the grains fit well with two main age components at 24-42 Ma and 43-70 Ma whereas the other components are not regularly distributed through the well. This pattern indicates a mixture of provenance from different areas along the Transantarctic Mountains (TAM). Furthermore, it suggests glacial expansion over the McMurdo Sound during the Pliocene, and periodically ice invading and retreating in Pleistocene. The data of post-LGM piston cores samples also show a large range of individual grain ages. The lack of systematic trends across the Ross Sea indicates the presence of multiple sources with a complex and differentiated erosional history. The presence of apatites ... |
author2 |
Li, Xia Zattin, Massimiliano Agnini, Claudia |
format |
Doctoral or Postdoctoral Thesis |
author |
Li, Xia |
author_facet |
Li, Xia |
author_sort |
Li, Xia |
title |
From Bedrock to Sediments: Insights on the Ross Sea Ice-Flow Dynamics Inferred from Detrital Data |
title_short |
From Bedrock to Sediments: Insights on the Ross Sea Ice-Flow Dynamics Inferred from Detrital Data |
title_full |
From Bedrock to Sediments: Insights on the Ross Sea Ice-Flow Dynamics Inferred from Detrital Data |
title_fullStr |
From Bedrock to Sediments: Insights on the Ross Sea Ice-Flow Dynamics Inferred from Detrital Data |
title_full_unstemmed |
From Bedrock to Sediments: Insights on the Ross Sea Ice-Flow Dynamics Inferred from Detrital Data |
title_sort |
from bedrock to sediments: insights on the ross sea ice-flow dynamics inferred from detrital data |
publisher |
Università degli studi di Padova |
publishDate |
2019 |
url |
http://hdl.handle.net/11577/3423168 |
geographic |
Antarctic The Antarctic Ross Sea West Antarctic Ice Sheet McMurdo Sound East Antarctic Ice Sheet Transantarctic Mountains |
geographic_facet |
Antarctic The Antarctic Ross Sea West Antarctic Ice Sheet McMurdo Sound East Antarctic Ice Sheet Transantarctic Mountains |
genre |
Antarc* Antarctic Ice Sheet McMurdo Sound Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Ice Sheet McMurdo Sound Ross Sea Sea ice |
op_relation |
http://hdl.handle.net/11577/3423168 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1796300637903781888 |