| Abstract: | The Indian Peak volcanic field is representative of the more than 50 000 km3 of ashflow tuff and tens of calderas in the Great Basin that formed during the Oligocene-early Miocene "ignimbrite flareup‘ in southwestern North America. These dominantly high-K calc-alkaline rocks are a record of the birth, maturation, and death of a large, open, continental magma system that was probably initiated and sustained by influx of mafic magma derived from a southward-migrating locus of magma production in the mantle. Recurrent production of very large batches (some greater than 3000 km3) of quite uniform dacite magmas appears to have required combination of andesite magma and crustal silicic material in vigorously convecting chambers. Compositional data indicate that rhyolites are polygenetic. As the main locus of mantle magma production shifted southward, trachydacite magma could have been produced by fractionation of andesitic magma within the crust. -from Author |
| Genre: | Article |
| ProdID: | 70015467 |
| Citation Author: | Best, M. G.; Christiansen, E. H.; Blank, Jr, R. H. |
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| Citation End Page: | 1090 |
| Citation Issue: | 8 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geological Society of America Bulletin |
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| Citation Number Of Pages: | 15 |
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| Citation Search Results Text: | Oligocene caldera complex and calc-alkaline tuffs and lavas of the Indian Peak volcanic field, Nevada and Utah; 1989; Article; Journal; Geological Society of America Bulletin; Best, M. G.; Christiansen, E. H.; Blank, Jr, R. H. |
| Citation Start Page: | 1076 |
| Citation Volume: | 101 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Oligocene caldera complex and calc-alkaline tuffs and lavas of the Indian Peak volcanic field, Nevada and Utah; 1989; Article; Journal; Geological Society of America Bulletin; Best, M. G.; Christiansen, E. H.; Blank, Jr, R. H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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