期刊
JOURNAL OF QUATERNARY SCIENCE
卷 25, 期 6, 页码 844-849出版社
WILEY
DOI: 10.1002/jqs.1427
关键词
Eastern Antarctic plateau; major element geochemistry; polar ice cores; tephra layers; volcanic stratigraphy
The new Antarctic TALDICE ice core (72 degrees 49' S, 159 degrees 11' E, 1620 m depth), containing abundant primary tephras, provides the opportunity to elucidate the late Quaternary volcanic history of the south polar region, as well as to broaden the East Antarctic tephrostratigraphic framework. Here grain size and glass compositional data for representative tephra layers from the last 70 ka core section are used for source identification. Results point to origin of layers from centres of the Melbourne Volcanic Province (McMurdo Volcanic Group), located similar to 250 km from the coring site. Occurrence of tephra layers within the ice core record suggests that explosive activity in the identified source was not constant over the considered period, with a minimum of activity between 20 and 35 ka, and increased activity back to 65 ka. In addition to palaeovolcanic implications, the TALDICE tephra layers offer prospects for firm correlations between diverse widely separated palaeoarchives and for accurate dating of the Antarctic climatic record. Copyright (C) 2010 John Wiley & Sons, Ltd.
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