1. 08 Ga diabase sills in the Pahrump Group, California: Implications for development of the Cordilleran miogeocline
Journal Article
·
· Geology; (United States)
- Royal Ontario Museum, Toronto (Canada)
- Massachusetts Inst. of Tech., Cambridge (United States)
U-Pb baddeleyite ages of 1087 {plus minus} 3 and 1069 {plus minus}3 Ma for two diabase sills that intrude the Crystal Spring Formation of the Pahrump Group, southeastern California, provide a minimum estimate for the depositional age of the Crystal Spring Formation. The new ages highlight the potential range in deposition ages for the Pahrump Group, from {ge} 1087 Ma to possibly as young as 600 Ma for Kingston Peak glaciogenic sediments. Consequently, there probably are significant disconformities within the Pahrump Group that separate unrelated, tectonically distinct episodes of basin subsidence. The Crystal Spring and Beck Spring Formations are considered to be platform-cover rocks preserved as a result of block faulting during deposition of the upper Kingston Peak Formation. The age of the Pahrump sills is in excellent agreement with the age of sills that intrude the Apache Group (central Arizona) and the Unkar Group (Grand Canyon) and supports earlier correlations to those units.
- OSTI ID:
- 7202285
- Journal Information:
- Geology; (United States), Journal Name: Geology; (United States) Vol. 20:7; ISSN GLGYB; ISSN 0091-7613
- Country of Publication:
- United States
- Language:
- English
Similar Records
Absolute age constraints on the age and tectonics of the Middle and Late Proterozoic Pahrump Group, southern Death Valley, California
Unconformities in the mid-Late Proterozoic Pahrump Group: Stratigraphic evidence from the upper member Crystal Spring Formation
Quaternary tectonics and basin history of Pahrump and Stewart Valleys, Nevada and California
Conference
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Thu Apr 01 04:00:00 UTC 1993
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5342684
Unconformities in the mid-Late Proterozoic Pahrump Group: Stratigraphic evidence from the upper member Crystal Spring Formation
Conference
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Thu Apr 01 04:00:00 UTC 1993
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5019828
Quaternary tectonics and basin history of Pahrump and Stewart Valleys, Nevada and California
Thesis/Dissertation
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Wed May 01 04:00:00 UTC 1991
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OSTI ID:10152981