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Geologic map of the Lassen region, Cascade Range, USA

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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.

Additional Publication Details

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
Number of Pages:
3
Conference Title:
1990 International Symposium on Geothermal Energy
Conference Location:
Kailua-Kona, HI, USA
Conference Date:
20 August 1990 through 24 August 1990