Meteorite Infall and Transport in Antarctica: an Analysis of Icefields as Accumulation Surfaces

Details Meteorite Infall and Transport in Antarctica: an Analysis of Icefields as Accumulation Surfaces Meteorite Infall and Transport in Antarctica: an Analysis of Icefields as Accumulation Surfaces

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nasa.repts....b&link_type=abstract

Technical Report, NASA/CR-97-207734; NAS 1.26:207734 Dept. of Chemistry and Biochemistry

Other

Antarctic Regions, Meteorites, Ice, Chondrites, Thermoluminescence, Wind (Meteorology), Confinement, Far Fields, Flow Stability, Weathering

Scientific paper

Over 10,000 meteorite fragments have been collected on only a dozen or so small icefields in Antarctica. The terrestrial history of these meteorites is important, both from the perspective of the effects of their ambient environment on the meteorites themselves, and on the information that can be derived in relation to ice flow and ice stability over periods of time up to 1 million years. We discuss the relative importance of meteorite infall, and ice and aeolian transport in creating meteorite accumulations and the importance of ice and aeolian transport and weathering in removing meteorites at various icefields in Antarctica. The present analysis is confined to equibrated ordinary chondrites. We use the natural thermoluminescence (TL) to to examine the effects of weathering. Natural TL is used in combination with size analysis to gauge the effects of aeolian transport. Some icefields, especially the Lewis Cliff Ice Tongue, are dominated by wind-transported fragments, while others, including the Far Western field at Allan Hills, have lost fragments. It appears that most Antarctic icefields preserve meteorite collections on time scales of a few tens of thousands of years.

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