Computer Science
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1399j&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Oct. 1980, p. 1399-1407. NASA-supported research.
Computer Science
1
Carbonaceous Meteorites, Enrichment, Mercury (Metal), Meteoritic Composition, Platinum, Residues, Activation Energy, Chemical Composition
Scientific paper
Carbon-rich and oxide residual phases have been isolated from Allende and Murchison by acid demineralization for the determination of their Hg, Pt-metal, Cr, Sc, Co, and Fe contents. Experimental procedures used eliminated the possibility of exogenous and endogenous contaminant trace elements from coprecipitating with the residues. Large enrichments of Hg and Pt-metals were found in Allende but not in Murchison residues. Hg-release profiles from stepwise heating experiments suggest a sulfide as the host for Hg. Diffusion calculations for Hg based on these experiments indicate an activation energy of 7-8 kcal/mol, the same as that for Hg in troilite from an iron meteorite. This is further support for a sulfide host phase for Hg. Equilibration of Hg with this phase at approximately 900 K is indicated. Reasons for the presence of Pt-metals in noncosmic relative abundances are explored.
Jovanovic Stanka
Reed George W. Jr.
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