Magmatic epidote and its petrologic significance
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Abstract
Epidote is a major magmatic mineral in tonalite and granodiorite in a belt coextensive with the Mesozoic accreted terranes between northern California and southeastern Alaska. Textural and chemical evidence indicates that epidote crystallized as a relatively late but magmatic mineral that formed through reaction with hornblende in the presence of a melt phase. The observed relations concur with experimental data on crystallization of epidote from synthetic granodiorite at 8 kbar total pressure. Plutonic rocks bearing magmatic epidote must have formed under moderately high pressures, corresponding to lower crustal depths, under fairly oxidizing conditions.
Publication type | Article |
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Publication Subtype | Journal Article |
Title | Magmatic epidote and its petrologic significance |
Series title | Geology |
DOI | 10.1130/0091-7613(1984)12<515:MEAIPS>2.0.CO;2 |
Volume | 12 |
Issue | 9 |
Year Published | 1984 |
Language | English |
Publisher | Geological Society of America |
Contributing office(s) | Eastern Mineral and Environmental Resources Science Center |
Description | 4 p. |
First page | 515 |
Last page | 518 |
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