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Hydrothermal alteration patterns in the Breitenbush Hot Springs area, Cascade Range, Oregon

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Abstract

Rocks of early Miocene age in the Breitenbush Hot Springs area have been affected by at least two major episodes of hydrothermal alteration, one of which had temperatures in excess of 200??C. Alteration minerals in younger Tertiary rocks are characteristic of temperatures below 100??C. The most important factor in controlling alteration is fracture permeability. The best guide to interpreting alteration is secondary mineralogy of volcaniclastic and pyroclastic rocks, flow breccia, and vesiculated or fractured lavas; alteration effects in interbedded massive lava flows are much more subtle.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Hydrothermal alteration patterns in the Breitenbush Hot Springs area, Cascade Range, Oregon
Volume
12
Year Published:
1988
Language:
English
Publisher:
Publ by Geothermal Resources Council
Publisher location:
Davis, CA, United States
Larger Work Title:
Transactions - Geothermal Resources Council
First page:
299
Last page:
304
Number of Pages:
6
Conference Title:
New Horizons
Conference Location:
San Diego, CA, USA
Conference Date:
9 October 1988 through 12 October 1988