| Abstract: | Nonmarine sedimentary and volcaniclastic foreland-basin deposits in the Spring Mountains are cut by the Contact and Keystone thrusts. These synorogenic deposits, informally designated the Lavinia Wash sequence by Carr (1980), previously were assigned a Late Jurassic to Early Cretaceous(?) age. New 40Ar.39Ar laser-fusion and incremental-heating studies of a tuff bed in the Lavinia Wash sequence support a best estimate age of 99.0 ?? 0.4 Ma, indicating that the Lavinia Wash sequence is actually late Early Cretaceous in age and establishing a maximum age for final emplacement of the Contact and Keystone thrust plates consistent with the remainder of the Mesozoic foreland thrust belt. -from Authors |
| Genre: | Article |
| ProdID: | 70015736 |
| Citation Author: | Fleck, R. J.; Carr, M. D. |
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| Citation End Page: | 476 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Tectonics |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | The age of the Keystone thrust: laser-fusion 40Ar/39Ar dating of foreland basin deposits, southern Spring Mountains, Nevada; 1990; Article; Journal; Tectonics; Fleck, R. J.; Carr, M. D. |
| Citation Start Page: | 467 |
| Citation Volume: | 9 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | The age of the Keystone thrust: laser-fusion 40Ar/39Ar dating of foreland basin deposits, southern Spring Mountains, Nevada; 1990; Article; Journal; Tectonics; Fleck, R. J.; Carr, M. D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
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