High integrated fluid/rock ratios during metamorphism at Naxos: evidence from carbon isotopes of calcite in schists and fluid inclusions |
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Authors: | Rob Kreulen |
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Institution: | (1) Institute of Earth Sciences, University of Utrecht, P.O. Box 80.021, NL-3508 TA Utrecht, The Netherlands |
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Abstract: | Calcite in schists of the metamorphic complex at Naxos is depleted both in 13C and in 18O with respect to massive marbles. This effect is attributed to isotope exchange with circulating CO2-rich fluids, which had an
>0.5 according to fluid inclusions. The carbon isotopic composition of the calcites is close to equilibrium with fluid inclusion CO2 at metamorphic temperatures. Mass balance calculations assuming initial
13C values of 0 for calcite and –5 for the fluid, give integrated fluid/rock volume ratios between 0.1 and 2.0. Such high fluid/rock ratios are supported by observations on the distribution of CO2/H2O ratios of fluid inclusions, carbon isotopic compositions of fluid inclusion CO2 and oxygen isotope systematics of silicates. |
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