Hydrogen and carbon isotopic composition of volatiles in Nakhla: Implications for weathering on Mars

Details Hydrogen and carbon isotopic composition of volatiles in Nakhla: Implications for weathering on Mars Hydrogen and carbon isotopic composition of volatiles in Nakhla: Implications for weathering on Mars

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992msat.work..165w&link_type=abstract

In Lunar and Planetary Inst., Workshop on the Martian Surface and Atmosphere Through Time p 165-166 (SEE N92-28988 19-91)

Computer Science

3

Collection, Mars (Planet), Mars Atmosphere, Meteorites, Planetary Geology, Weathering, Carbon Dioxide, Carbon 13, Hydrogen, Low Temperature

Scientific paper

Gases were collected at 120, 200, 300, 415, and 600 and 850 C. Hydrogen yields for the 600 and 850 C aliquots were measured separately and then the gases were combined for isotopic analysis. CO2 samples collected at the two lowest temperature steps amounted to less than 0.5 mu mole and were not analyzed isotopically. Excluding the 120 C temperature step, the bulk delta D of the sample was + 187 percent. Delta D values increase from -91 percent in the 120 C step to +518 percent in the 315 to 850 C step. The hydrogen content is greatest in the 120 C step and is roughly constant in the 200, 300, and 415 C aliquots. Between 415 C and 850 C, the yield drops off considerably. From 850 C to 950 C, virtually no H2 and only minor CO2 (less than 1 mu mole) were extracted. Using the isotopic analysis from the 300, 415, 600, and 850 C temperature collections, the bulk delta C-13(PDB) is 0.0 percent. The heaviest component (delta C-13(PDB) of +29 percent) was collected between 300 and 415 C. The release of hydrogen at the low temperatures reported here is consistent with the breakdown of the phases that constitute the alteration product between approx. 250 and 650 C. Although not as high as the present Martian atmosphere, the high delta D values are consistent with a Martian origin for the meteorites in question.

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