Abstract
Research Article| December 01, 1976 Geology of Crater Elegante, Sonora, Mexico JAMES T. GUTMANN JAMES T. GUTMANN 1Department of Earth and Environmental Sciences, Wesleyan University, Middletoivn, Connecticut 06457 Search for other works by this author on: GSW Google Scholar Author and Article Information JAMES T. GUTMANN 1Department of Earth and Environmental Sciences, Wesleyan University, Middletoivn, Connecticut 06457 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 (12): 1718–1729. https://doi.org/10.1130/0016-7606(1976)87<1718:GOCESM>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 JAMES T. GUTMANN; Geology of Crater Elegante, Sonora, Mexico. GSA Bulletin 1976;; 87 (12): 1718–1729. doi: https://doi.org/10.1130/0016-7606(1976)87<1718:GOCESM>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 Crater Elegante is a circular, flat-floored, volcanic depression 1.6 km in diameter located in the Pinacate volcanic field, northwestern Sonora, Mexico. Exposed in its steep walls is an eruptive sequence of late Pleistocene age that is made up of numerous flows and pyroclastic units of porphyritic alkali basalt and hawaiite. Rapid alternation of effusive and pyroclastic activity is evident. The forms of intravolcanic sills and dikes are displayed in vertical cross section in the crater walls, as are structural relationships between flows and pyroclastic layers deposited on them while the flows were still mobile.Eruptive activity at Crater Elegante culminated catastrophically with ejection and base-surge dispersal of large quantities of pyroclastic materials. These form a blanket of tuff breccia and contain vesicular juvenile ash as their dominant constituent at the crater rim. Fine-grained accidental ejecta in the tuff breccia deposits increase in relative abundance with distance from the rim. The volume of accessory debris in the ejecta blanket is much smaller than the volume of the crater. Although the diameter of the original vent is not known, it must have been much smaller than the diameter of Crater Elegante. The crater formed chiefly by wholesale collapse of the volcanic edifice following eruption of ultravesiculating magma and evisceration of a large chamber located within fine-grained, water-bearing sediments beneath the volcanic pile. Thus, Crater Elegante in some respects resembles a maar but is in fact a small collapse caldera. 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
