Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5691
AuthorsDi Vincenzo, G.* 
Bracciali, L.* 
Del Carlo, P.* 
Panter, K.* 
Rocchi, S.* 
Title40Ar--39Ar 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
Issue Date2009
URIhttp://hdl.handle.net/2122/5691
KeywordsANDRILL SMS
40Ar–39Ar geochronology
Erebus Volcanic Province
McMurdo Sound
lava clasts
sedimentation rate
tephra layers
Victoria Land Basin
Subject Classification04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating, processes, transport 
04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks 
AbstractThe 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 meters below sea floor, ~11.5–16.0 Ma) and >780 m of Early Miocene (~358–1093 48 meters below sea floor, ~16.0–20.1 Ma). Results also highlight a nearly continuous stratigraphic record from at least 358 meters 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 meters below sea floor down hole, with the “proto-Mount Morning” as the main source.
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