Computer Science
Scientific paper
May 1953
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1953gecoa...3..224r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 3, Issue 5, pp.224-234
Computer Science
5
Scientific paper
The isotopic constitution of silicon in minerals and rocks has been examined. In general, the Si 30 content decreases as one goes from a high-temperature mineral (olivine) to low-temperature pegmatite quartz to vein quartz to geyserite; the greatest isotope separation occurring in the last two steps, which involve deposition from an aqueous phase rather than crystallization from a silicate melt. Organic silica deposited from sea-water (chert, marine diatomite) shows an increase in Si 30 over olivine, whereas a fresh-water diatomite has an isotopic composition consistent with that of silicon from hot springs (geyserite). The isotopic composition of silicon in a stony meteorite is surprising, as it shows a lower Si 30 /Si 28 ratio than olivine or even oligoclase from a pegmatite. In general the distribution of the silicon isotopes is similar to that of oxygen isotopes reported by ; some exceptions are noted. The variation in isotopic constitution of silicon is small (the maximum difference encountered in the ratio Si 30 /Si 28 being 3 per mil) indicating presumably a relatively simple geochemical history involving few opportunities for exchange with gas phases or aqueous solutions.
Reynolds John H.
Verhoogen John
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