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NaSi⇌CaAl exchange equilibrium between plagioclase and amphibole

An empirical model

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Abstract

The exchange equilibrium between plagioclase and amphibole, 2 albite+tschermakite=2 anorthite+glaucophane, has been calibrated empirically using data from natural amphibolites. The partition coefficient, K D, for the exchange reaction is (X an/X ab)plag ·(Na, M4/Ca, M4)amph.. Partitioning is systematic between plagioclase and amphibole in suites collected from single exposures, but the solid solutions are highly non-ideal: values of In K D range from −3.0 at X an=0.30 to −1.0 at X an=0.90 in samples from a single roadcut. Changes in both K D and the topology of the ternary reciprocal exchange diagram occur with increasing metamorphic grade. Temperature dependence of In K D is moderate with Δ¯H≃35 to 47 kcal at X an=0.25; pressure dependence is small with Δ¯V≃ −0.24 cal/bar. Usefulness of this exchange equilibrium as a geothermometer is restricted by uncertainties in the calculation of the amphibole formula from a microprobe analysis, especially with regard to Na, M4 in amphibole, to approximately ±50 ° C.

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  1. Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, 02139, Cambridge, Massachusetts, USA

    Frank S. Spear

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  1. Frank S. Spear
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Spear, F.S. NaSi⇌CaAl exchange equilibrium between plagioclase and amphibole. Contrib. Mineral. Petrol. 72, 33–41 (1980). https://doi.org/10.1007/BF00375566

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  • DOI: https://doi.org/10.1007/BF00375566

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