40 Ar– 39 Ar dating of volcanogenic products from the AND-2A core (ANDRILL Southern McMurdo Sound Project, Antarctica): Correlations with the Erebus Volcanic Province and implications for the age model of the core
The AND-2A drillcore (Antarctic Drilling Program—ANDRILL) was successfully completed in late 2007 on the Antarctic continental margin (Southern McMurdo Sound, Ross Sea) with the aim of tracking ice proximal to shallow marine environmental fluctuations and to document the 20-Ma evolution of the Erebu...
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ftunivnebraskali:oai:digitalcommons.unl.edu:andrillrespub-1052 2023-11-12T04:03:33+01:00 40 Ar– 39 Ar dating of volcanogenic products from the AND-2A core (ANDRILL Southern McMurdo Sound Project, Antarctica): Correlations with the Erebus Volcanic Province and implications for the age model of the core Di Vincenzo, Gianfranco Bracciali, Laura Del Carlo, Paola Panter, Kurt Rocchi, Sergio 2010-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/andrillrespub/52 https://digitalcommons.unl.edu/context/andrillrespub/article/1052/viewcontent/Di_Vincenzo_BV_2010_40AR39AR_dating__DC_VERSION.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/andrillrespub/52 https://digitalcommons.unl.edu/context/andrillrespub/article/1052/viewcontent/Di_Vincenzo_BV_2010_40AR39AR_dating__DC_VERSION.pdf ANDRILL Research and Publications ANDRILL SMS 40Ar–39Ar geochronology Erebus volcanic province McMurdo Sound Lava clasts Sedimentation rate Tephra layers Victoria Land Basin Environmental Indicators and Impact Assessment text 2010 ftunivnebraskali 2023-10-30T10:49:12Z The AND-2A drillcore (Antarctic Drilling Program—ANDRILL) was successfully completed in late 2007 on the Antarctic continental margin (Southern McMurdo Sound, Ross Sea) with the aim of tracking ice proximal to shallow marine environmental fluctuations and to document the 20-Ma evolution of the Erebus Volcanic Province. Lava clasts and tephra layers from the AND-2A drillcore were investigated from a petrographic and stratigraphic point of view and analyzed by the 40Ar–39Ar laser technique in order to constrain the age model of the core and to gain information on the style and nature of sediment deposition in the Victoria Land Basin since Early Miocene. Ten out of 17 samples yielded statistically robust 40Ar–39Ar ages, indicating that the AND-2A drillcore recovered ≤230 m of Middle Miocene (~128–358 m below sea floor, ~11.5–16.0 Ma) and >780 m of Early Miocene (~358–1093 m below sea floor, ~16.0–20.1 Ma). Results also highlight a nearly continuous stratigraphic record from at least 358 m below sea floor down hole, characterized by a mean sedimentation rate of ~19 cm/ka, possible oscillations of no more than a few hundreds of ka and a break within ~17.5–18.1 Ma. Comparison with available data from volcanic deposits on land, suggests that volcanic rocks within the AND-2A core were supplied from the south, possibly with source areas closer to the drill site for the upper core levels, and from 358 m below sea floor down hole, with the “proto-Mount Morning” as the main source. Text Antarc* Antarctic Antarctica McMurdo Sound Ross Sea Victoria Land University of Nebraska-Lincoln: DigitalCommons@UNL Antarctic The Antarctic Ross Sea Victoria Land McMurdo Sound Mount Morning ENVELOPE(163.750,163.750,-78.450,-78.450) |
institution |
Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
ANDRILL SMS 40Ar–39Ar geochronology Erebus volcanic province McMurdo Sound Lava clasts Sedimentation rate Tephra layers Victoria Land Basin Environmental Indicators and Impact Assessment |
spellingShingle |
ANDRILL SMS 40Ar–39Ar geochronology Erebus volcanic province McMurdo Sound Lava clasts Sedimentation rate Tephra layers Victoria Land Basin Environmental Indicators and Impact Assessment Di Vincenzo, Gianfranco Bracciali, Laura Del Carlo, Paola Panter, Kurt Rocchi, Sergio 40 Ar– 39 Ar dating of volcanogenic products from the AND-2A core (ANDRILL Southern McMurdo Sound Project, Antarctica): Correlations with the Erebus Volcanic Province and implications for the age model of the core |
topic_facet |
ANDRILL SMS 40Ar–39Ar geochronology Erebus volcanic province McMurdo Sound Lava clasts Sedimentation rate Tephra layers Victoria Land Basin Environmental Indicators and Impact Assessment |
description |
The AND-2A drillcore (Antarctic Drilling Program—ANDRILL) was successfully completed in late 2007 on the Antarctic continental margin (Southern McMurdo Sound, Ross Sea) with the aim of tracking ice proximal to shallow marine environmental fluctuations and to document the 20-Ma evolution of the Erebus Volcanic Province. Lava clasts and tephra layers from the AND-2A drillcore were investigated from a petrographic and stratigraphic point of view and analyzed by the 40Ar–39Ar laser technique in order to constrain the age model of the core and to gain information on the style and nature of sediment deposition in the Victoria Land Basin since Early Miocene. Ten out of 17 samples yielded statistically robust 40Ar–39Ar ages, indicating that the AND-2A drillcore recovered ≤230 m of Middle Miocene (~128–358 m below sea floor, ~11.5–16.0 Ma) and >780 m of Early Miocene (~358–1093 m below sea floor, ~16.0–20.1 Ma). Results also highlight a nearly continuous stratigraphic record from at least 358 m below sea floor down hole, characterized by a mean sedimentation rate of ~19 cm/ka, possible oscillations of no more than a few hundreds of ka and a break within ~17.5–18.1 Ma. Comparison with available data from volcanic deposits on land, suggests that volcanic rocks within the AND-2A core were supplied from the south, possibly with source areas closer to the drill site for the upper core levels, and from 358 m below sea floor down hole, with the “proto-Mount Morning” as the main source. |
format |
Text |
author |
Di Vincenzo, Gianfranco Bracciali, Laura Del Carlo, Paola Panter, Kurt Rocchi, Sergio |
author_facet |
Di Vincenzo, Gianfranco Bracciali, Laura Del Carlo, Paola Panter, Kurt Rocchi, Sergio |
author_sort |
Di Vincenzo, Gianfranco |
title |
40 Ar– 39 Ar dating of volcanogenic products from the AND-2A core (ANDRILL Southern McMurdo Sound Project, Antarctica): Correlations with the Erebus Volcanic Province and implications for the age model of the core |
title_short |
40 Ar– 39 Ar dating of volcanogenic products from the AND-2A core (ANDRILL Southern McMurdo Sound Project, Antarctica): Correlations with the Erebus Volcanic Province and implications for the age model of the core |
title_full |
40 Ar– 39 Ar dating of volcanogenic products from the AND-2A core (ANDRILL Southern McMurdo Sound Project, Antarctica): Correlations with the Erebus Volcanic Province and implications for the age model of the core |
title_fullStr |
40 Ar– 39 Ar dating of volcanogenic products from the AND-2A core (ANDRILL Southern McMurdo Sound Project, Antarctica): Correlations with the Erebus Volcanic Province and implications for the age model of the core |
title_full_unstemmed |
40 Ar– 39 Ar dating of volcanogenic products from the AND-2A core (ANDRILL Southern McMurdo Sound Project, Antarctica): Correlations with the Erebus Volcanic Province and implications for the age model of the core |
title_sort |
40 ar– 39 ar dating of volcanogenic products from the and-2a core (andrill southern mcmurdo sound project, antarctica): correlations with the erebus volcanic province and implications for the age model of the core |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2010 |
url |
https://digitalcommons.unl.edu/andrillrespub/52 https://digitalcommons.unl.edu/context/andrillrespub/article/1052/viewcontent/Di_Vincenzo_BV_2010_40AR39AR_dating__DC_VERSION.pdf |
long_lat |
ENVELOPE(163.750,163.750,-78.450,-78.450) |
geographic |
Antarctic The Antarctic Ross Sea Victoria Land McMurdo Sound Mount Morning |
geographic_facet |
Antarctic The Antarctic Ross Sea Victoria Land McMurdo Sound Mount Morning |
genre |
Antarc* Antarctic Antarctica McMurdo Sound Ross Sea Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica McMurdo Sound Ross Sea Victoria Land |
op_source |
ANDRILL Research and Publications |
op_relation |
https://digitalcommons.unl.edu/andrillrespub/52 https://digitalcommons.unl.edu/context/andrillrespub/article/1052/viewcontent/Di_Vincenzo_BV_2010_40AR39AR_dating__DC_VERSION.pdf |
_version_ |
1782337831290535936 |