Mathematics – Logic
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41..431j&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Issue 3, pp.431-435
Mathematics
Logic
Scientific paper
Oxygen isotope analyses of five olivines from the Darrington peridotite, Washington, yield O 18 values of +7.3 to +8.9%. which are consistent with derivation of these rocks from a serpentinite precursor. The isotopic data are compatible with mineralogical, textural and chemical evidence that most of the Darrington peridotites have formed by deserpentinization. Olivine from a single, petro-graphically distinct peridotite sample has a O 18 -value of +5.2%. which is within the field of high-temperature olivines. The isotopic and textural evidence indicate that this is a partially recrystallized peridotite tectonite. Oxygen and carbon isotope analyses of dolomites from olivine-carbonate rocks indicate that they could have originated by introduction of atmospheric CO 2 via meteoric waters during the formation of ophidolomites or ophicalcites. Subsequent metamorphism and reequilibration have modified the O 18 -values.
Dungan Michael A.
Johnson Michael
Vance Joseph A.
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