Magmatic epidote and its petrologic significance
Geology
By: E-An Zen and J. M. Hammarstrom
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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 |
|---|---|
| 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 |