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Antarctic micrometeoritesMicrometeoroids in the size range 50-500 micron dominate the flux onto the Earth. Contrary to theoretical predictions, many of them survive atmospheric entry almost unchanged. Such micrometeorites can be collected from the Antarctic ice sheet where they account for a surprisingly large proportion of the total dust content of the ice. Early studies of this important class of extraterrestrial material have revealed that some Antarctic micrometeorites are similar to CM chondrites in chemical bulk composition and mineral composition, and a few seem to resemble CI chondrites. However, none of the micrometeorites investigated so far match CM or CI chondrites exactly, nor is there a match between average bulk micrometeorite composition and that of any other chondrite class. Also, the micrometeorite mineral chemistry is different from that of carbonaceous chondrites. Several elements are depleted in micrometeorites as compared to carbonaceous chondrites and some are enriched. The question arises whether these differences are pristine or if some of them are of secondary origin. On the basis of our data we will attempt to answer these questions, some of which have been addressed by us before.
Document ID
19950004548
Document Type
Conference Paper
Authors
Kurat, G. (Naturhistorisches Museum Vienna, Austria)
Koeberl, C. (Naturhistorisches Museum Vienna, Austria)
Presper, T. (Naturhistorisches Museum Vienna, Austria)
Brandstaetter, F. (Naturhistorisches Museum Vienna, Austria)
Maurette, Michel (Naturhistorisches Museum Vienna, Austria)
Date Acquired
September 6, 2013
Publication Date
January 1, 1994
Publication Information
Publication: Lunar and Planetary Inst., Workshop on the Analysis of Interplanetary Dust Particles
Subject Category
ASTROPHYSICS
Funding Number(s)
PROJECT: FWF PROJ. P8125-GEO
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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