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Multistage emplacement of the McDoogle pluton, an early phase of the John Muir intrusive suite, Sierra Nevada, California, by magmatic crack-seal growth

2014; Geological Society of America; Volume: 126; Issue: 11-12 Linguagem: Inglês

10.1130/b31062.1

1943-2674

Michael A. Stearns, John M. Bartley,

earthquake and tectonic studies

Research Article| November 01, 2014 Multistage emplacement of the McDoogle pluton, an early phase of the John Muir intrusive suite, Sierra Nevada, California, by magmatic crack-seal growth Michael A. Stearns; Michael A. Stearns † Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA †E-mail: mstearns@umail.ucsb.edu. Search for other works by this author on: GSW Google Scholar John M. Bartley John M. Bartley Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA Search for other works by this author on: GSW Google Scholar GSA Bulletin (2014) 126 (11-12): 1569–1579. https://doi.org/10.1130/B31062.1 Article history received: 07 Jan 2014 rev-recd: 14 Apr 2014 accepted: 16 May 2014 first online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Michael A. Stearns, John M. Bartley; Multistage emplacement of the McDoogle pluton, an early phase of the John Muir intrusive suite, Sierra Nevada, California, by magmatic crack-seal growth. GSA Bulletin 2014;; 126 (11-12): 1569–1579. doi: https://doi.org/10.1130/B31062.1 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 SocietyGSA Bulletin Search Advanced Search Abstract New mapping of the southern McDoogle pluton, an early intrusion in the John Muir suite in the central Sierra Nevada, California, has resolved important details of incremental assembly by magmatic crack-seal. The tabular McDoogle pluton concordantly intruded the steeply dipping mylonitic Sawmill Lake shear zone around 95 Ma. The pluton was previously divided into three phases based on wall-rock screen abundance and lithology. The earliest central phase consists of steep dikes separated by abundant wall-rock screens. These screens are largely absent from border phases located on either side of the central phase. The inferred relative ages of intrusive phases and the wall-rock screen distribution signify a change from antitaxial (addition at the margins of the central phase) to syntaxial (addition at the center of each border phase) assembly during pluton growth. Interaction among the effects of preexisting foliation, older nondeformed intrusions, and synintrusive static recovery of shear zone rocks likely caused the transition from antitaxial to syntaxial growth. The trend from antitaxial to syntaxial growth during emplacement has been observed in other intrusions and intrusive suites and may be a general pattern of incremental intrusion associated with the feedback between preexisting deformation and thermal addition in magmatic arcs. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.