Geologic map of the Lassen region, Cascade Range, USA
By: Michael Clynne and L.J. Muffler
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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.
Suggested Citation
Clynne, M., Muffler, L., 1990, Geologic map of the Lassen region, Cascade Range, USA, in Transactions - Geothermal Resources Council, v. 14, no. pt 2, Kailua-Kona, HI, USA, 20 August 1990 through 24 August 1990, p. 1387-1389.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Geologic map of the Lassen region, Cascade Range, USA |
| ISBN | 0934412685 |
| Volume | 14 |
| Issue | pt 2 |
| Year Published | 1990 |
| Language | English |
| Publisher | Publ by Geothermal Resources Council |
| Publisher location | Davis, CA, United States |
| Larger Work Title | Transactions - Geothermal Resources Council |
| First page | 1387 |
| Last page | 1389 |
| Conference Title | 1990 International Symposium on Geothermal Energy |
| Conference Location | Kailua-Kona, HI, USA |
| Conference Date | 20 August 1990 through 24 August 1990 |