Cross section of a magma conduit system at the margin of the Colorado Plateau

Abstract

Research Article| August 01, 2003 Cross section of a magma conduit system at the margin of the Colorado Plateau Keith Putirka; Keith Putirka 1Department of Earth and Environmental Sciences, California State University, 2345 East San Ramon Avenue, MS MH24, Fresno, California 93740, USA Search for other works by this author on: GSW Google Scholar Christopher D. Condit Christopher D. Condit 2Geoscience Department, University of Massachusetts, Amherst, Massachusetts 01003-9297, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Keith Putirka 1Department of Earth and Environmental Sciences, California State University, 2345 East San Ramon Avenue, MS MH24, Fresno, California 93740, USA Christopher D. Condit 2Geoscience Department, University of Massachusetts, Amherst, Massachusetts 01003-9297, USA Publisher: Geological Society of America Received: 29 Jan 2003 Revision Received: 25 Apr 2003 Accepted: 30 Apr 2003 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2003) 31 (8): 701–704. https://doi.org/10.1130/G19550.1 Article history Received: 29 Jan 2003 Revision Received: 25 Apr 2003 Accepted: 30 Apr 2003 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Keith Putirka, Christopher D. Condit; Cross section of a magma conduit system at the margin of the Colorado Plateau. Geology 2003;; 31 (8): 701–704. doi: https://doi.org/10.1130/G19550.1 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 SocietyGeology Search Advanced Search Abstract We present crystallization depth vs. temperature estimates for clinopyroxene phenocrysts from the Springerville volcanic field, Arizona. These calculations reveal several intriguing patterns that have considerable implications for magma transport and genesis. First, partial crystallization occurs over a wide depth range (0–60 km), but most partial crystallization occurs between 0 and 30 km. Second, low crystallization temperatures, low-density magmas, and evolved liquid compositions derive exclusively from two depth intervals, 0–12 and 23–30 km. These intervals coincide with a density contrast in the upper crust and a rheology contrast at the base of the middle crust. They also coincide with two highly seismically reflective depth intervals. These relationships indicate that (1) the Moho is not a staging area for volcanic eruptions; (2) density contrasts in the upper crust, and a rheology contrast in the middle crust, control magma transport and liquid evolution; (3) magma conduits are probably magma mush columns, with a preponderance of sills within the 0–12 and 23–30 km intervals; and (4) seismically reflective layers are sills related to Tertiary–Holocene volcanic activity. Moreover, these sills appear to represent the principal sites of magma evolution. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.