| Abstract: | The Raft River valley, near the boundary of the Snake River plain with the Basin and Range province, is a north-trending late Cenozoic downwarp bounded by faults on the west, south, and east. Pleistocene alluvium and Miocene-Pliocene tuffaceous sediments, conglomerate, and felsic volcanic rocks aggregate 2 km in thickness. Large gravity, magnetic, and total field resistivity highs probably indicate a buried igneous mass that is too old to serve as a heat source. Differing seismic velocities relate to known or inferred structures and to a suspected shallow zone of warm water. Resistivity anomalies reflect differences of both composition and degree of alteration of Cenozoic rocks. Resistivity soundings show a 2 to 5 ohm·m unit with a thickness of 1 km beneath a large part of the valley, and the unit may indicate partly hot water and partly clayey sediments. Observed self-potential anomalies are believed to indicate zones where warm water rises toward the surface. Boiling wells at Bridge, Idaho are near the intersection of north-northeast normal faults which have moved as recently as the late (?) Pleistocene, and an east-northeast structure, probably a right-lateral fault. Deep circulation of ground water in this region of relatively high heat flow and upwelling along faults is the probable cause of the thermal anomaly. |
| Genre: | Article |
| ProdID: | 70042576 |
| Citation Author: | Williams, Paul L.; Mabey, Don R.; Zohdy, Adel A. R.; Hans, Ackerman ; Hoover, Donald B.; Pierce, Kenneth L.; Oriel, Steven S. |
| Citation Contributing Office: | Energy Resources Program |
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| Citation End Page: | 1282 |
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| Citation Language: | English |
| Citation Larger Work Title: | Proceedings: second United Nations Symposium on the development and use of geothermal resources, San Francisco, California, USA, 20-29 May 1975 |
| Citation LatN: | 49.0 |
| Citation LatS: | 42.0 |
| Citation LonE: | -111.04 |
| Citation LonW: | -117.24 |
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| Citation Online Only Flag: | |
| Citation Phsyical Description: | 10 p. |
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| Citation Publisher: | U.S. Energy Research and Development Administration |
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| Citation Search Results Text: | Geology and geophysics of the southern Raft River Valley geothermal area, Idaho, USA; 1976; Article; Conference publication; Proceedings: second United Nations Symposium on the development and use of geothermal resources, San Francisco, California, USA, 20-29 May 1975; Williams, Paul L.; Mabey, Don R.; Zohdy, Adel A. R.; Hans, Ackerman ; Hoover, Donald B.; Pierce, Kenneth L.; Oriel, Steven S. |
| Citation Start Page: | 1273 |
| Citation Volume: | 2 |
| Citation Year: | 1976 |
| Type: | citation/reference |
| Text: | Geology and geophysics of the southern Raft River Valley geothermal area, Idaho, USA; 1976; Article; Conference publication; Proceedings: second United Nations Symposium on the development and use of geothermal resources, San Francisco, California, USA, 20-29 May 1975; Williams, Paul L.; Mabey, Don R.; Zohdy, Adel A. R.; Hans, Ackerman ; Hoover, Donald B.; Pierce, Kenneth L.; Oriel, Steven S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 2013 00:00 -0600 |
| Publisher: | U.S. Energy Research and Development Administration |
| Superseded by: |
http://pubs.er.usgs.gov/publication/ofr75322
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