| Abstract: | New evidence for a possible resurgent dome in the caldera related to eruption of the Bullfrog Member of the Crater Flat Tuff has been provided by recent drilling of a 762-meter (2,501-foot) hole in central Crater Flat. Although no new volcanic units were penetrated by the drill hole (USW-VH-1), the positive aeromagnetic anomaly in the vicinity of the drill hole appears to result in part from the unusually thick, densely welded tuff of the Bullfrog. Major units penetrated include alluvium, basalt of Crater Flat, Tiva Canyon and Topopah Spring Members of the Paintbrush Tuff, and Prow Pass and Bullfrog Members of the Crater Flat Tuff.
In addition, the drill hole provided the first subsurface hydrologic information for the area. The water table in the hole is at about 180 meters (600 feet), and the temperature gradient appears slightly higher than normal for the region. |
| Genre: | USGS Numbered Series |
| ProdID: | 8220 |
| Citation Author: | Carr, W. J. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | ii, 25 p. ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 82-457 |
| Citation Search Results Text: | Volcanotectonic history of Crater Flat, southwestern Nevada, as suggested by new evidence from drill hole USW-VH-1 and vicinity; 1982; OFR; 82-457; Carr, W. J. |
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| Citation Year: | 1982 |
| Type: | citation/reference |
| Text: | Volcanotectonic history of Crater Flat, southwestern Nevada, as suggested by new evidence from drill hole USW-VH-1 and vicinity; 1982; OFR; 82-457; Carr, W. J. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1982/0457/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1982/0457/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
