| Reference Type | Journal (article/letter/editorial) |
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| Title | Petrogenesis of spilite and keratophyre from a Permian and Triassic volcanic arc terrane, eastern Oregon and western Idaho, U.S.A. |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Vallier, T. L. | Author |
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| Batiza, Rodey | Author |
| Year | 1978 (August 1) | Volume | 15 |
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| Issue | 8 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e78-140Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 475975 | Long-form Identifier | mindat:1:5:475975:5 |
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| GUID | 0 |
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| Full Reference | Vallier, T. L., Batiza, Rodey (1978) Petrogenesis of spilite and keratophyre from a Permian and Triassic volcanic arc terrane, eastern Oregon and western Idaho, U.S.A. Canadian Journal of Earth Sciences, 15 (8) 1356-1369 doi:10.1139/e78-140 |
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| Plain Text | Vallier, T. L., Batiza, Rodey (1978) Petrogenesis of spilite and keratophyre from a Permian and Triassic volcanic arc terrane, eastern Oregon and western Idaho, U.S.A. Canadian Journal of Earth Sciences, 15 (8) 1356-1369 doi:10.1139/e78-140 |
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| In | (1978, August) Canadian Journal of Earth Sciences Vol. 15 (8) Canadian Science Publishing |
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| Abstract/Notes | Spilite, keratophyre, and quartz keratophyre from a Permian and Triassic volcanic arc assemblage in eastern Oregon and western Idaho originally were low-potassium basalt, andesite, dacite, and possibly rhyolite. Amphibolite from an abyssal sea floor or marginal basin environment of either Permian or Triassic age originally was low-potassium basalt. Present mineralogies are characteristic of the greenschist and amphibolite facies of regional metamorphism. Greenschist facies minerals are mostly albite, epidote, chlorite, calcite, and quartz, whereas amphibolite facies minerals are predominantly hornblende, plagioclase (andesine), and epidote. In the volcanic arc assemblage, mineralogies of the Permian rocks are nearer equilibrium in the greenschist facies than those of the overlying Triassic rocks, probably reflecting deeper burial. Bulk compositions indicate extensive ion mobility, but there has been a general internal mass balance of most components. Na2O, CO2, and H2O were probably added to most rocks, but the source of those components has not been established. |
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