Computer Science
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2377m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 9, pp.2377-2386
Computer Science
8
Scientific paper
The isotopic composition of coexisting fluid and dissolved carbon species in MORB glass have been studied using a combination of replicate stepped heating experiments, vacuum crushing and grain-size analysis. Stepped heating carbon release profiles demonstrate the presence of isotopically light carbon released by combustion below 600°C (LTC) and isotopically heavier carbon released above 600°C (HTC). Up to 95% of the LTC component, which mostly resides on the surface of the glass, can be removed by extraction in dichloromethane; combustion at 400 and 600°C ensures its complete removal prior to extraction of HTC species above 600°C. Assuming that HTC consists of fluid (i.e. CO 2 trapped within vesicles) and dissolved ( i.e. carbonate ion complexes) species, limits on the net difference between the isotopic composition of coexisting fluid and dissolved carbon have been estimated from stepped heating data. The apparent magnitude of carbon isotopic fractionation between CO 2 vapour and basaltic melt is greater than 1%. but significantly less than 4:5%. and localised fractionation processes associated with magma degassing are associated with co 2 -basait men values of 2%.
Exley Richard A.
Mattey David P.
Pillinger Colin T.
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