Abstract
Research Article| May 01, 1976 Aeromagnetic survey of the San Gabriel Anorthosite Complex, San Gabriel Mountains, southern California DAVID CUMMINGS; DAVID CUMMINGS 1Department of Geology, Occidental College, Los Angeles, California 90041 Search for other works by this author on: GSW Google Scholar ROBERT D. REGAN ROBERT D. REGAN 2U.S. Geological Survey, National Center, Reston, Virginia 22092 Search for other works by this author on: GSW Google Scholar Author and Article Information DAVID CUMMINGS 1Department of Geology, Occidental College, Los Angeles, California 90041 ROBERT D. REGAN 2U.S. Geological Survey, National Center, Reston, Virginia 22092 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1976) 87 (5): 675–680. https://doi.org/10.1130/0016-7606(1976)87<675:ASOTSG>2.0.CO;2 Article history First Online: 01 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 DAVID CUMMINGS, ROBERT D. REGAN; Aeromagnetic survey of the San Gabriel Anorthosite Complex, San Gabriel Mountains, southern California. GSA Bulletin 1976;; 87 (5): 675–680. doi: https://doi.org/10.1130/0016-7606(1976)87<675:ASOTSG>2.0.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 SocietyGSA Bulletin Search Advanced Search Abstract The Precambrian San Gabriel Anorthosite Complex, San Gabriel Mountains, southern California, is composed of genetically related anorthosite, gabbro, and norite. Aeromagnetic studies and field observations indicate that the gabbro and norite underlie the anorthosite.Field relations of the three units and textures of primary igneous features indicate that final stages of crystallization occurred, in part, by crystal settling. These observations and a geophysical interpretation of one magnetic anomaly as a feeder dike for the complex suggest that the anorthosite complex may have formed in two stages: (1) intrusion of crystal mush through the feeder dike, possibly by a mechanism of flow differentiation, and (2) final crystallization, after intrusion, by crystal settling. Subsequently, the complex was tectonically raised to its present position. 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.
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