| Abstract: | A preliminary geologic map at 1:50,000 of the Lassen region encompasses 1400 km2. The map displays many small, monogenetic volcanoes of basalt to andesite as well as three major late Pliocene and Quaternary volcanic centers that have erupted products ranging from basaltic andesite to rhyolite. The youngest of these volcanic centers is the Lassen volcanic center, active from 600,000 years B.P. to the present. A major caldera formed at 400,000 years B.P. and has subsequently been filled with silicic lavas. The Lassen geothermal system, which consists of a central vapor-dominated reservoir at a temperature of 235??C underlain by a reservoir of hot water, is centered at Bumpass Hell within Lassen Volcanic National Park. |
| Genre: | Conference Paper |
| ProdID: | 70015758 |
| Citation Author: | Clynne, Michael; Muffler, L. J. |
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| Citation End Page: | 1389 |
| Citation Issue: | pt 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Transactions - Geothermal Resources Council |
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| Citation Number Of Pages: | 3 |
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| Citation Publisher: | Publ by Geothermal Resources Council |
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| Citation Search Results Text: | Geologic map of the Lassen region, Cascade Range, USA; 1990; Conference Paper; Transactions - Geothermal Resources Council; Clynne, Michael; Muffler, L. J. |
| Citation Start Page: | 1387 |
| Citation Volume: | 14 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Geologic map of the Lassen region, Cascade Range, USA; 1990; Conference Paper; Transactions - Geothermal Resources Council; Clynne, Michael; Muffler, L. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
| Publisher: | Publ by Geothermal Resources Council |
