Mathematics – Logic
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.547w&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 547
Mathematics
Logic
3
Chassignites, Hydrogen Isotopes, Meteoritic Composition, Shergottites, Ion Probes, Mars (Planet), Mineralogy, Moisture Content, Radioactive Age Determination, Temperature Effects
Scientific paper
We report the yield and D/H of water released by stepped heating of bulk Shergotty, Zagami, Chassigny, and the newest martian meteorite, ALH 84001. For comparison, we also report data from Nakhla using the same procedure since the heating steps in this study are slightly different than our previously reported nakhlite analyses. With this work, we have completed a survey of D/H in bulk samples representative of all SNC mineralogical types. Assuming these meteorites are martian samples, the D/H of the water contained in SNC hydrous phases might be a useful tracer of water that once resided in the martian atmosphere or has isotopically exchanged with it. A heating procedure similar to Karlsson et al.'s was used to facilitate direct comparison to their O data in which high values of Delta O-17 relative to bulk SNCs were observed in water released from some samples at high temperatures. Hydrogen isotopic compositions of water released at each temperature step and total water yields for each sample are reported. Yields generally agree with those of Karlsson et al. except in the case of Shergotty, which was found to contain approximately one-third less water. Similar to earlier results for the nakhlites, isotopic compositions are terrestrial at low temperatures and delta(D) values increase with increasing temperature for all samples except Chassigny. Both this study and our ion microprobe measurements suggest that the shergottites may contain more D-enriched water than other SNCs. Although preliminary until further measurements can be made, this distinction may be reflecting the difference in geologic history or age of Shergotty and Zagami relative to the possibly older and more deeply emplaced nakhlites, Chassigny and ALH 84001.
Epstein Samuel
Stolper Edward M.
Watson L. L.
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