Hydrothermal alteration patterns in the Breitenbush Hot Springs area, Cascade Range, Oregon
By: Terry E.C. Keith
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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.
Suggested Citation
Keith, T.E., 1988, Hydrothermal alteration patterns in the Breitenbush Hot Springs area, Cascade Range, Oregon, in Transactions - Geothermal Resources Council, v. 12, San Diego, CA, USA, 9 October 1988 through 12 October 1988, p. 299-304.
| 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 |
| Conference Title | New Horizons |
| Conference Location | San Diego, CA, USA |
| Conference Date | 9 October 1988 through 12 October 1988 |