Ion microprobe analysis of oxygen and carbon isotope ratios in the ALH84001 meteorite

Details Ion microprobe analysis of oxygen and carbon isotope ratios in the ALH84001 meteorite Ion microprobe analysis of oxygen and carbon isotope ratios in the ALH84001 meteorite

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1475v&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 475.

Computer Science

1

Chondrites, Carbon Isotopes, Ion Probes, Oxygen Isotopes, Carbonates, Silicates, Carbon 12, Carbon 13, Oxygen 18

Scientific paper

A Cameca ims 4f ion microprobe is used to analyze carbonate and silicate minerals in the Martian meteorite ALH84001 in situ for (O-18/(O-16) and (C-13)/(C-12). The present sample is composed predominantly of orthopyroxene with minor chromite, maskelynite, pyrite, SiO2, and multiple generations of carbonate, including disk-shaped carbonate concretions reported to contain submicroscopic grains of magnetite and greigite. Ten analyses of orthopyroxene show homogeneity at delta(O-18) = 4.6 +/- 1.3 mil pct. Chemical compositions of carbonate in ALH84001 are reported in the fields of low-temperature immiscibility of the Ca-Mg-Fe carbonate system.

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