40Ar-39Ar dating and isotopic composition of groundmass and felspar samples from core AND-2A ...

• Main Authors: Di Vincenzo, Gianfranco, Bracciali, Laura, Del Carlo, Paola, Panter, Kurt S, Rocchi, Sergio
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2010
• Subjects: Drilling/drill rig; SMS; McMurdo Station; Antarctic Geological Drilling ANDRILL; International Polar Year 2007-2008 IPY; Antarc*; Antarctic; International Polar Year; IPY; McMurdo Sound; Ross Sea; Victoria Land
• Online Access: https://dx.doi.org/10.1594/pangaea.809107; https://doi.pangaea.de/10.1594/PANGAEA.809107

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 ... : Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...