Miocene-Pliocene-Pleistocene Glacial History of Arena Valley, Quartermain Mountains, Antarctica

An 40 Ar/ 39 Ar chronology of in-situ to near in-situ volcanic ashfall deposits indicates that the surficial stratigraphy of Arena Valley extends back at least to middle-Miocene time. Wet-based glacial ice occupied part of Arena Valley more than 11.3 Ma ago. Thick, northeast-flowing ice subsequently...

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Bibliographic Details
Published in:Geografiska annaler. Series A, Physical geography Physical geography, 1993, Vol.75 (4), p.269-302
Main Authors: Marchant, David R., Denton, George H., Swisher, Carl C.
Format: Article
Language:English
Subjects:
Alpine glaciers
Altars
Bedrock
Colluvium
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochronology
Glacial landforms
Glaciers
Isotope geochemistry. Geochronology
Moraines
Sandstones
Stratigraphy
Valleys
Volcanic ash
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Summary:An 40 Ar/ 39 Ar chronology of in-situ to near in-situ volcanic ashfall deposits indicates that the surficial stratigraphy of Arena Valley extends back at least to middle-Miocene time. Wet-based glacial ice occupied part of Arena Valley more than 11.3 Ma ago. Thick, northeast-flowing ice subsequently engulfed Arena Valley, again more than 11.3 Ma ago. Only minor glacier expansion occurred during Pliocene and Pleistocene time. The maximum Pliocene thickening of Taylor Dome, 35 km inland of Arena Valley, was certainly less than 475 m and probably less than 250 m. Maximum thickening of Taylor Dome was less than 160 m during the Pleistocene. The preservation of Miocene-and Pliocene-age ashes on steep valley slopes indicates that the major bedrock land-forms of Arena Valley are relict and that little slope evolution/colluviation has occurred during the last 11.3 Ma. The geologic record of Arena Valley glaciation and landscape evolution shows persistent cold-desert conditions and hence implies stability of the adjacent East Antarctic Ice Sheet for at least the last 11.3 Ma.
ISSN:0435-3676
1468-0459
DOI:10.1080/04353676.1993.11880397