Other
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.2585y&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 11, pp.2585-2597
Other
1
Scientific paper
CO 2 laser-heating in a fluorinating atmosphere was used to obtain 18 O / 16 O analyses of coexisting garnet, staurolite, muscovite, chlorite, and quartz from a sample of the Gassetts schist, southeastern Vermont, USA. Garnet and quartz 18 O v - smow values vary on a millimeter scale while values for other minerals are uniform within analytical uncertainties. Garnets exhibit 18 O / 16 O zoning with core 18 O values of 10.9 ± 0.3 and rim values of 10.1 ± 0.2. The depletion of 18 O in garnet rims correlates with reversals in cation zonation and intracrystalline textural unconformities. Quartz plucked from a garnet core yields a 18 O of 14.8 while vein quartz 18 O values vary from 14.3 ± 0.2 in centers to 13.8 ± 0.1 at margins. Staurolite, muscovite, and chlorite have mean 18 O values of 10.8, 11.9, and 10.3, respectively. Two parageneses are distinguished on the basis of the mineral 18 O and expected isotope partitioning and on the basis of textures. One consists of garnet cores, staurolite, muscovite, and quartz included in garnet. Garnet rims, chlorite, and vein quartz comprise the other. Quantitative models which explain the lower bulk 18 O of the garnet-rim assemblage show that garnet textural unconformities represent resorption during infiltration of externally derived aqueous fluid. Chlorite grew by this hydration reaction and was the principal storage site for low 18 O / 16 O oxygen. Low- 18 O garnet rims later grew at the expense of chlorite with little change in modal abundances of staurolite and muscovite. Retention of pre-infiltration 18 O in muscovite precludes significant diffusion of oxygen in this phase and indicates that the total duration of external fluid flow was 10 5 years.
Rumble Douglas III
Young Edward D.
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