The textures and compositions of fine-grained Antarctic micrometeorites - Implications for comparisons with meteorites

Details The textures and compositions of fine-grained Antarctic micrometeorites - Implications for comparisons with meteorites The textures and compositions of fine-grained Antarctic micrometeorites - Implications for comparisons with meteorites

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61.5149g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 61, p. 5149

Computer Science

39

Micrometeorites, Meteoritic Composition, Earth Surface, Interplanetary Dust, Silicates, Antarctic Regions, Textures, Asteroids, Comets, Grain Size

Scientific paper

Eighty-nine fine-grained Antarctic micrometeorites (fg-AMMs) were studied in order to evaluate their state of alteration and to identify the nature of their precursor materials. These fg-AMMs were compared to meteorites to constrain their state of alteration and the nature of their precursor materials. Fg-AMMs are divided into melted and unmelted groups and subdivided on the basis of textures related to atmospheric entry heating. Fg-AMMs were chosen because they dominate the collection (about 76 percent) and include particles which resemble a primitive unequilibrated meteorite matrix. Although melted AMMs have textural affinities with coarse-grained materials, their relative abundances suggest that their precursors are likely to have been fine-grained. The alternative possibility of producing melted AMMs from coarse-grained precursors is also discussed. The textures of melted particles reflect crystallization after entry heating, and those of unmelted AMMs broadly resemble those of the CI, CM, and CR chondrite matrix. The matrix compositions of the fg-AMMs closely resemble those of CM2 chondrites. It is concluded that the micrometeorite record can provide invaluable information on the relative abundance and nature of small bodies in the solar system which cannot be derived from meteorites.

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