Late Quaternary sediments from deep-sea sediment drifts on the Antarctic Peninsula Pacific margin: Climatic control on provenance of minerals
We present results of detailed paleomagnetic investigations on deep-sea cores from sediment drifts located along the Pacific continental margin of the Antarctic Peninsula. High-resolution magnetic measurements on u channel samples provide detailed age models for three cores collected from drift 7, w...
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Online Access: | http://hdl.handle.net/11365/8112 https://doi.org/10.1029/2010JB007952 |
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ftunivsiena:oai:usiena-air.unisi.it:11365/8112 2024-04-14T08:04:37+00:00 Late Quaternary sediments from deep-sea sediment drifts on the Antarctic Peninsula Pacific margin: Climatic control on provenance of minerals Venuti, A Florindo, F. Caburlotto, A. Hounslov, M. W. Hillenbrand, C. D. Strada, E. Talarico, F. M. Cavallo, A. Venuti, A Florindo, F. Caburlotto, A. Hounslov, M. W. Hillenbrand, C. D. Strada, E. Talarico, F. M. Cavallo, A. 2011 ELETTRONICO http://hdl.handle.net/11365/8112 https://doi.org/10.1029/2010JB007952 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000292144500001 volume:116 issue:6 journal:JOURNAL OF GEOPHYSICAL RESEARCH: SOLID EARTH http://hdl.handle.net/11365/8112 doi:10.1029/2010JB007952 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-79959575094 info:eu-repo/semantics/closedAccess CONTINENTAL RISE WEST GLACIAL-INTERGLACIAL DEPOSITION REVERSAL CURVE DIAGRAMS MAGNETIC-PROPERTIES SOUTHERN-OCEAN NORTH-ATLANTIC GRAIN-SIZE GEOMAGNETIC PALEOINTENSITY ENVIRONMENTAL MAGNETISM GREIGITE FORMATION info:eu-repo/semantics/article 2011 ftunivsiena https://doi.org/10.1029/2010JB007952 2024-03-21T16:03:06Z We present results of detailed paleomagnetic investigations on deep-sea cores from sediment drifts located along the Pacific continental margin of the Antarctic Peninsula. High-resolution magnetic measurements on u channel samples provide detailed age models for three cores collected from drift 7, which document an age of 122 ka for the oldest sediments recovered near the drift crest at site SED-07 and a high sedimentation rate (11 cm/kyr) at site SED-12 located close to the Alexander Channel system. Low- and high-temperature magnetic measurements in conjunction with microscopic and mineralogic observations from drifts 4, 5 and 7 indicate that pseudosingle-domain detrital titanomagnetite (partially oxidized and with limited Ti substitution) is the dominant magnetic mineral in the drift sediments. The titanomagnetite occurs in two magnetic forms: (1) a low-coercivity form similar to laboratory-synthesized titanomagnetite and (2) a high-coercivity form (Bcr > 60 mT). These two forms vary in amount and stratigraphic distribution across the drifts. We did not find evidence for diagenetic magnetic iron sulfides as has been previously suggested for these drift deposits. The observed change of magnetic mineralogy in sediments deposited during Heinrich events on drift 7 appears to be related to warming periods, which temporarily modified the normal glacial transport pathways of glaciogenic detritus to and along the continental rise and thus resulted in deposition of sediments with a different provenance. Understanding this sediment provenance delivery signature at a wider spatial scale should provide information about ice sheet dynamics in West Antarctica over the last ∼100 kyr. Copyright 2011 by the American Geophysical Union. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet North Atlantic Southern Ocean West Antarctica Università degli Studi di Siena: USiena air Antarctic Antarctic Peninsula Pacific Southern Ocean The Antarctic West Antarctica Journal of Geophysical Research 116 B6 |
institution |
Open Polar |
collection |
Università degli Studi di Siena: USiena air |
op_collection_id |
ftunivsiena |
language |
English |
topic |
CONTINENTAL RISE WEST GLACIAL-INTERGLACIAL DEPOSITION REVERSAL CURVE DIAGRAMS MAGNETIC-PROPERTIES SOUTHERN-OCEAN NORTH-ATLANTIC GRAIN-SIZE GEOMAGNETIC PALEOINTENSITY ENVIRONMENTAL MAGNETISM GREIGITE FORMATION |
spellingShingle |
CONTINENTAL RISE WEST GLACIAL-INTERGLACIAL DEPOSITION REVERSAL CURVE DIAGRAMS MAGNETIC-PROPERTIES SOUTHERN-OCEAN NORTH-ATLANTIC GRAIN-SIZE GEOMAGNETIC PALEOINTENSITY ENVIRONMENTAL MAGNETISM GREIGITE FORMATION Venuti, A Florindo, F. Caburlotto, A. Hounslov, M. W. Hillenbrand, C. D. Strada, E. Talarico, F. M. Cavallo, A. Late Quaternary sediments from deep-sea sediment drifts on the Antarctic Peninsula Pacific margin: Climatic control on provenance of minerals |
topic_facet |
CONTINENTAL RISE WEST GLACIAL-INTERGLACIAL DEPOSITION REVERSAL CURVE DIAGRAMS MAGNETIC-PROPERTIES SOUTHERN-OCEAN NORTH-ATLANTIC GRAIN-SIZE GEOMAGNETIC PALEOINTENSITY ENVIRONMENTAL MAGNETISM GREIGITE FORMATION |
description |
We present results of detailed paleomagnetic investigations on deep-sea cores from sediment drifts located along the Pacific continental margin of the Antarctic Peninsula. High-resolution magnetic measurements on u channel samples provide detailed age models for three cores collected from drift 7, which document an age of 122 ka for the oldest sediments recovered near the drift crest at site SED-07 and a high sedimentation rate (11 cm/kyr) at site SED-12 located close to the Alexander Channel system. Low- and high-temperature magnetic measurements in conjunction with microscopic and mineralogic observations from drifts 4, 5 and 7 indicate that pseudosingle-domain detrital titanomagnetite (partially oxidized and with limited Ti substitution) is the dominant magnetic mineral in the drift sediments. The titanomagnetite occurs in two magnetic forms: (1) a low-coercivity form similar to laboratory-synthesized titanomagnetite and (2) a high-coercivity form (Bcr > 60 mT). These two forms vary in amount and stratigraphic distribution across the drifts. We did not find evidence for diagenetic magnetic iron sulfides as has been previously suggested for these drift deposits. The observed change of magnetic mineralogy in sediments deposited during Heinrich events on drift 7 appears to be related to warming periods, which temporarily modified the normal glacial transport pathways of glaciogenic detritus to and along the continental rise and thus resulted in deposition of sediments with a different provenance. Understanding this sediment provenance delivery signature at a wider spatial scale should provide information about ice sheet dynamics in West Antarctica over the last ∼100 kyr. Copyright 2011 by the American Geophysical Union. |
author2 |
Venuti, A Florindo, F. Caburlotto, A. Hounslov, M. W. Hillenbrand, C. D. Strada, E. Talarico, F. M. Cavallo, A. |
format |
Article in Journal/Newspaper |
author |
Venuti, A Florindo, F. Caburlotto, A. Hounslov, M. W. Hillenbrand, C. D. Strada, E. Talarico, F. M. Cavallo, A. |
author_facet |
Venuti, A Florindo, F. Caburlotto, A. Hounslov, M. W. Hillenbrand, C. D. Strada, E. Talarico, F. M. Cavallo, A. |
author_sort |
Venuti, A |
title |
Late Quaternary sediments from deep-sea sediment drifts on the Antarctic Peninsula Pacific margin: Climatic control on provenance of minerals |
title_short |
Late Quaternary sediments from deep-sea sediment drifts on the Antarctic Peninsula Pacific margin: Climatic control on provenance of minerals |
title_full |
Late Quaternary sediments from deep-sea sediment drifts on the Antarctic Peninsula Pacific margin: Climatic control on provenance of minerals |
title_fullStr |
Late Quaternary sediments from deep-sea sediment drifts on the Antarctic Peninsula Pacific margin: Climatic control on provenance of minerals |
title_full_unstemmed |
Late Quaternary sediments from deep-sea sediment drifts on the Antarctic Peninsula Pacific margin: Climatic control on provenance of minerals |
title_sort |
late quaternary sediments from deep-sea sediment drifts on the antarctic peninsula pacific margin: climatic control on provenance of minerals |
publishDate |
2011 |
url |
http://hdl.handle.net/11365/8112 https://doi.org/10.1029/2010JB007952 |
geographic |
Antarctic Antarctic Peninsula Pacific Southern Ocean The Antarctic West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula Pacific Southern Ocean The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet North Atlantic Southern Ocean West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet North Atlantic Southern Ocean West Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000292144500001 volume:116 issue:6 journal:JOURNAL OF GEOPHYSICAL RESEARCH: SOLID EARTH http://hdl.handle.net/11365/8112 doi:10.1029/2010JB007952 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-79959575094 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1029/2010JB007952 |
container_title |
Journal of Geophysical Research |
container_volume |
116 |
container_issue |
B6 |
_version_ |
1796301262217543680 |