Other
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..645m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 47, Issue 3, pp.645-654
Other
10
Scientific paper
Oxygen isotope fractionations between zoisite and water have been studied at 400-700°C, PH 2 O = 13.4 kbar, using the three-isotope method described by et al. (1978) and et al. (1983a). The zoisite-waier exchange reaction takes place extremely slowly and consequently direct-exchange calibration of equilibrium 18 O / 16 O fractionation factors was possible only at 600 and 700°C. Fractionation factors at 400-600°C were determined from samples hydrothermally crystallized from a glass of the anhydrous zoisite composition. At 600°C, both exchange procedures gave identical fractionations within experimental error. Scanning electron microscope studies showed that the zoisite-water exchange reaction occurs largely by solution-precipitation mass-transfer mechanisms. The slow kinetics of zoisite-water exchange may be typical of hydrous silicates, since additional experiments on tremolite-water and chlorite-water exchange also showed very low rates. When the zoisite-water fractionation factors determined in this study are combined with the quartz and albite-water data of et al. (1979) and the calcite-water data of et al. (1969), mineral-pair fractionations are obtained for which the coefficients " A " in the equation 1000 In = A × 10 6 T -2 are: Fractionation data on coexisting quartz-zoisite (epidote) ± calcite in metamorphic rocks yield temperatures which do not appear to represent peak metamorphic conditions and possibly reflect the complexity of the chemistry of the epidotes and/or the complexity of zoisite and epidote parageneses.
Clayton Robert N.
Goldsmith Julian R.
Matthews Alan
No associations
LandOfFree
Oxygen isotope fractionation between zoisite and water does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Oxygen isotope fractionation between zoisite and water, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oxygen isotope fractionation between zoisite and water will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1467373