Origin of phenocrysts and compositional diversity in pre-Mazama rhyodacite lavas, Crater Lake, Oregon
Journal of Petrology
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Abstract
Phenocrysts in porphyritic volcanic rocks may originate in a variety of ways in addition to nucleation and growth in the matrix in which they are found. Porphyritic rhyodacite lavas that underlie the eastern half of Mount Mazama, the High Cascade andesite/dacite volcano that contains Crater Lake caldera, contain evidence that bears on the general problem of phenocryst origin. Phenocrysts in these lavas apparently formed by crystallization near the margins of a magma chamber and were admixed into convecting magma before eruption. About 20 km3 of pre-Mazama rhyodacite magma erupted during a relatively short period between ~400 and 500 ka; exposed pre-Mazama dacites are older and less voluminous. The rhyodacites formed as many as 40 lava domes and flows that can be assigned to three eruptive groups on the basis of composition and phenocryst content. -from Authors
Suggested Citation
Nakada, S., Bacon, C., and Gartner, A., 1994, Origin of phenocrysts and compositional diversity in pre-Mazama rhyodacite lavas, Crater Lake, Oregon: Journal of Petrology, v. 35, no. 1, p. 127-162, https://doi.org/10.1093/petrology/35.1.127.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Origin of phenocrysts and compositional diversity in pre-Mazama rhyodacite lavas, Crater Lake, Oregon |
| Series title | Journal of Petrology |
| DOI | 10.1093/petrology/35.1.127 |
| Volume | 35 |
| Issue | 1 |
| Year Published | 1994 |
| Language | English |
| Publisher | Oxford Academic |
| Contributing office(s) | Volcano Hazards Program, Volcano Science Center |
| Description | 36 p. |
| First page | 127 |
| Last page | 162 |
| Country | United States |
| State | Oregon |
| Other Geospatial | Crater Lake |