Computer Science
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mmws.work...39s&link_type=abstract
Workshop on the Issue Martian Meteorites: Where do we Stand and Where are we Going?, p. 39
Computer Science
Atmospheric Composition, Carbonates, Isotopes, Oxygen, Siderites, Snc Meteorites, Meteoritic Composition, Water, Carbon Dioxide, Planetary Atmospheres, Mars Atmosphere, Magnesium, Manganese, Hydrogen
Scientific paper
We have previously [1] reported the O-isotopic measurements of two grains (CI and C3) of Mn-rich siderite in Nakhla, Four O-isotopic measures were identical within error, yielding mean delta(18)0 = 34 plus or minus 1 per mil SMOW. This is the heaviest carbonate yet reported from a martian meteorite. We now explore the implications of these data for martian volatiles. More recently, we have measured more carbonate grains (C8, C9, ClO) that differ chemically from Cl and C3, being richer in Mg and lower in Mn. These new grains still have delta 18(0) near 34 per mil (the accuracy of each measurement is 1-2 per mil). The carbonate grains are orange-brown in transmitted light, suggesting some staining by ferric oxides; C8 was particularly badly stained, and its lower delta 18(0) probably reflects contamination by oxides and/or silicates.
Lyon Ian C.
Saxton John M.
Turner Gary
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