Experimental reversals of chlorite compositions in divariant MgO + Al2O3 + SiO2 + H2O assemblages

被引：0
作者：
Baker, Judy [1 ]
Holland, T.J.B. [1 ]
机构：
[1] Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, United Kingdom
来源：
American Mineralogist | / 81卷 / 5-6期
关键词：
Silica; -; Corundum; Magnesia;
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摘要：
The compositions of chlorite in divariant assemblages involving orthopyroxene + forsterite and spinel + corundum were reversed at a range of temperatures for P = 14 kbar and a range of pressures for T = 800°C. These compositions, determined using a new calibration of the variation in the c unit-cell parameter with Xchl, were then compared with those calculated using several simple activity-composition models for charge-balanced Tschermak substitutions in MASH chlorite. The discrepancies between the observations and calculations suggest that entropies of mixing are very low in chlorite solid solutions.
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页码：676 / 684
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