1.08 Ga diabase sills in the Pahrump Group, California: Implications for development of the Cordilleran miogeocline

Research Article| July 01, 1992 1.08 Ga diabase sills in the Pahrump Group, California: Implications for development of the Cordilleran miogeocline L. M. Heaman; L. M. Heaman 1Department of Geology, Royal Ontario Museum, Toronto, Ontario M5S 2C6, Canada Search for other works by this author on: GSW Google Scholar J. P. Grotzinger J. P. Grotzinger 2Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Search for other works by this author on: GSW Google Scholar Author and Article Information L. M. Heaman 1Department of Geology, Royal Ontario Museum, Toronto, Ontario M5S 2C6, Canada J. P. Grotzinger 2Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1992) 20 (7): 637–640. https://doi.org/10.1130/0091-7613(1992)020<0637:GDSITP>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation L. M. Heaman, J. P. Grotzinger; 1.08 Ga diabase sills in the Pahrump Group, California: Implications for development of the Cordilleran miogeocline. Geology 1992;; 20 (7): 637–640. doi: https://doi.org/10.1130/0091-7613(1992)020<0637:GDSITP>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract U-Pb baddeleyite ages of 1087 ±3 and 1069 ±3 Ma for twodiabase 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 high-light the potential range in deposition ages for the Pahrump Group, from ≥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 of those units. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.