Oxygen isotopic constraints on the genesis of carbonates from Martian meteorite ALH84001

Details Oxygen isotopic constraints on the genesis of carbonates from Martian meteorite ALH84001 Oxygen isotopic constraints on the genesis of carbonates from Martian meteorite ALH84001

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998gecoa..62....3l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 62, p. 3

Biology

30

Oxygen 18, Carbonates, Snc Meteorites, Meteoritic Composition, Precipitation (Chemistry), Extraterrestrial Life, Activity (Biology), Petrography

Scientific paper

The paper reports in-situ isotopic measurements of a wide range of ALH84001 carbonates, both from globules and from other types of occurrences, covering the major element compositional range from ankerite to magnesite. The delta O-18 values are found to be highly variable, ranging from +5.4 to +25.3 per mille, and are correlated with the major element compositions, such that the earliest-forming Ca-rich carbonates have the lowest delta O-18 values, and the Mg-rich late-forming carbonates have the highests delta O-18 values. Two possible models are presented which can explain the isotopic variation. However, more information is needed in order to distinguish between the models.

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