Magnetite in carbonaceous chondrites

Details Magnetite in carbonaceous chondrites Magnetite in carbonaceous chondrites

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..611h&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 611.

Computer Science

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Magnetite, Carbonaceous Chondrites, Morphology, Meteorites

Scientific paper

Magnetite (Fe3O4) occurs in many carbonaceous chondrites (CCs) and has long attracted the attention of meteorite researchers. However, its origin is unresolved; suggestions range from condensates from the solar nebular to products from aqueous alteration on the meteorite parent body. The report of possible evidence of former life in ancient Martian meteorite ALH84001 suggested an additional and highly intriguing origin for certain meteoritic magnetite, namely as magnetosomes from bacteria. However, a recent publication reports TEM evidence of spiral defects running through some of the the magnetite in ALHA84001, interpreted as evidence for a high temperature origin. These studies provide special interest to the occurrence of magnetite in meteorites. Using SEM, we studied magnetite from the Orgueil, Murchison, and Kaba and Mokoia meteorites, and obtained images at a nm-scale. We also did EMPA measurements to determine the compositions of the magnetite and surrounding minerals.

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