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- W1998597212 abstract "Research Article| December 01, 1990 Late Cretaceous age of fractures in the Sierra Nevada batholith, California Paul Segall; Paul Segall 1U.S. Geological Survey, Menlo Park, California 940252Department of Geophysics, Stanford University, Stanford, California 94305 Search for other works by this author on: GSW Google Scholar Edwin H. McKee; Edwin H. McKee 1U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Stephen J. Martel; Stephen J. Martel 3Earth Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 Search for other works by this author on: GSW Google Scholar Brent D. Turrin Brent D. Turrin 1U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Author and Article Information Paul Segall 1U.S. Geological Survey, Menlo Park, California 940252Department of Geophysics, Stanford University, Stanford, California 94305 Edwin H. McKee 1U.S. Geological Survey, Menlo Park, California 94025 Stephen J. Martel 3Earth Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 Brent D. Turrin 1U.S. Geological Survey, Menlo Park, California 94025 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1990) 18 (12): 1248–1251. https://doi.org/10.1130/0091-7613(1990)018<1248:LCAOFI>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 MailTo Tools Icon Tools Get Permissions Search Site Citation Paul Segall, Edwin H. McKee, Stephen J. Martel, Brent D. Turrin; Late Cretaceous age of fractures in the Sierra Nevada batholith, California. Geology 1990;; 18 (12): 1248–1251. doi: https://doi.org/10.1130/0091-7613(1990)018<1248:LCAOFI>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 Regional sets of steeply dipping joints and faults are common throughout the Sierra Nevada batholith, yet relatively little is known about how or when they formed. Within some east-northeast-striking, left-lateral fault zones in the Mount Abbot quadrangle of the central Sierra Nevada, the host granodiorite is hydrothermally altered to a lower greenschist assemblage that contains muscovite. The muscovite yields a mean K-Ar and 40Ar/39Ar age of 79 Ma, which provides a minimum age for the faulting. Field relations show that these faults developed from earlier formed, mineralized joints, so these ages also provide a minimum age for the jointing. Published ages of biotite, hornblende, and zircon from the host granodiorite of Lake Edison are 80 Ma (K-Ar), 85 Ma (K-Ar), and 90 Ma (U-Pb), respectively. The geochronology, field relations, and hydrothermal mineral assemblages together suggest that the mineralized joints and faults all formed between 85 and 79 Ma, soon after the host pluton was emplaced. 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." @default.
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- W1998597212 title "Late Cretaceous age of fractures in the Sierra Nevada batholith, California" @default.
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