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• W2189133034 abstract "Hydrothermal experiments have been performed in the systen cacor-srco. from 350o to 650C over a range of I to 5 kbar. The results reconcile inconsistencies in previous determinations of low-temperature phase equilibria for binary Ca-Sr carbonates, and demonstrate that the small amounts of Sr in natural metamorphic aragonite extend the field of its stability to slightly lower pressures than in the unary CaCO, system. The phase equilibrium data also provide evidence for the existence of two structurally distinct rhombohedral carbonates at elevated pressures in the binary Ca-Sr system. Because of the exact correspondence of the present high-pressure results to previous X-ray determinations of one-atmosphere phase relations, one of these two polymorphs is identified as a calcite structure having ordered CO3 groups, and the other as a calcite-like structure in which the 'CO, groups display rotational disordering about their triad axes. The preferential fractionation of Sr into the disordered phase favors a model for its crystal structure in which the cations occupy ninefold coordinated sites. Experiments in the binary ca-Sr system identify a three-phase equilibrium at which these two rhombohedral phases coexist with an orthorhombic aragonite solid solution. This threephase equilibrium can be traced to a unary triple-point near 475C and l0 kbar in the p111e CaCO3 system; aragonite, ordered calcite, and disordered calcite are all stable under these conditions. Because the calcite-aragonite boundary is strongly curved at temperatures below the triple point but nearly linear above it, the curvature is attributed to a gradual disordering of tle CO, groups with increasing temperatue. Differential solubility of Sr in the ordered and disordered calcite phases simultaneously in equilibrium with Sr-bearing aragonite requires, however, that the transition itself be thermodynamically frst-order." @default.
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• W2189133034 date "1980-01-01" @default.
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• W2189133034 title "The calcite-araqonite eouilibrinm: effects of Sr substitution aid anion brientational disorder" @default.
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