Mathematics – Logic
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71.5565g&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 71, Issue 22, p. 5565-5575.
Mathematics
Logic
15
Scientific paper
Aqueous alteration of primitive meteorites was among the earliest geological processes during the evolution of our solar system. ‘Clumped-isotope’ thermometry of carbonates in the CM chondrites, Cold Bokkeveld, Murray, and Murchison, demonstrates that they underwent aqueous alteration at 20 71 °C from a fluid with δ18OVSMOW of 2.0‰ to 8.1‰ and δ17OVSMOW of -0.1‰ to 3.0‰. The δ13CVPDB values of these carbonates exhibit a negative correlation with the δ18OVSMOW of their formation waters, consistent with formation and escape of 13C-depleted CH4 during aqueous alteration. Methane generation under these conditions implies that the alteration fluid was characterized by an Eh ⩽ -0.67 and pH ⩾ 12.5 (or lower at the highest alteration temperatures). Our findings suggest that methane generation may have been a widespread consequence of planetesimal and planetary aqueous alteration, perhaps explaining the occurrence of methane on Titan, Triton, Pluto, and other Kuiper-belt objects.
Eiler John M.
Guo Weifu
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