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.
Suggested Citation
Zen, E., and Hammarstrom, J.M., 1984, Magmatic epidote and its petrologic significance: Geology, v. 12, no. 9, p. 515-518, https://doi.org/10.1130/0091-7613(1984)12<515:MEAIPS>2.0.CO;2.
| 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 |