Hydrothermal stability of clinozoisite plus quartz

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ID: 296839
1966
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Abstract
The relative stability of the assemblages clinozoisite-quartz and epidote-grossularite-anorthite have been determined between 1 and 4 kb using a rate technique in which the reaction is monitored with a single crystal of one of the participating phases. Clinozoisite and quartz react fractionally forming progressively more iron-rich epidote with anorthite and grossularite garnet as temperature rises. Between 1 and 7 kb, the relation T=533.6+34.5 P-0.6 P ^2^ (T degrees C, P kb) provides the best clinozoisite-quartz dehydration curve. Iron-rich epidote is stable with quartz at least 32 degrees above clinozoisite-quartz. Results indicate that where grandite and anorthite occur at the expense of clinozoisite and quartz in high grade Barrovian metamorphic rocks, temperatures must have exceeded 675 degrees C if P ~tot~ \> or =6Kb,P ~water~ \> or =1/2 P ~tot~ .
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Authors M. J. Holdaway
Journal american journal of science
Year 1966
DOI
10.2475/ajs.264.8.643
URL
https://ajs.scholasticahq.com/article/59143.pdf
Keywords Keywords not found

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