Mathematics – Logic
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54..631s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 3, pp.631-639
Mathematics
Logic
4
Scientific paper
Clathrate hydrates may form in aqueous, gas-rich fluid inclusions during low-temperature microthermometric analysis. Gases are differentially partitioned between the clathrate and residual fluid as a function of temperature, pressure, and bulk composition. Of particular concern in multicomponent gas-bearing inclusions is the fact that the selective partitioning of individual gases into clathrate hydrate can strongly affect the interpretation of microthermometric data. The absolute extent of depletion of gases (consumed by clathrate) in the residual fluid is dependent upon both the composition of the gas and the relative proportions of H 2 O and gas-rich fluid. The equilibrium phase relations in clathrate systems may be modeled in order to correct for the presence of clathrates. Quantitative modeling of CO 2 ---CH 4 ---H 2 O, and consideration of CO 2 ---N 2 ---H 2 O, N 2 ---CH 4 ---H 2 O, and H 2 S---CH 4 ---H 2 O indicates th and extent of differential partitioning of gases and the temperature-pressure-composition stabilities of clathrates. For instance, under a geologically reasonable range of pressure, H 2 S and CH 4 will partition into clathrate more strongly than N 2 , whereas the direction of partitioning between CO 2 and CH 4 and between CO 2 and N 2 changes as a function of temperature, pressure, and the relative proportions of the components. Comparison of experimental data for unary- and binary-gas systems and the model of et al. (1985) indicates that the model correctly predicts clathrate stabilities and is useful for fluid inclusion studies.
Dill Pasteris Jill
Seitz Jeffery C.
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