Geology and Petrology of Volcan Ceboruco, Nayarit, Mexico

Research Article| November 01, 1980 Geology and Petrology of Volcan Ceboruco, Nayarit, Mexico Stephen A. Nelson Stephen A. Nelson 1Department of Geology and Geophysics, University of California, Berkeley. California 94720 Department of Geology, Tulane University, New Orleans Louisiana 70118 Search for other works by this author on: GSW Google Scholar Author and Article Information Stephen A. Nelson 1Department of Geology and Geophysics, University of California, Berkeley. California 94720 Department of Geology, Tulane University, New Orleans Louisiana 70118 Publisher: Geological Society of America Revision Received: 10 Mar 1980 Accepted: 08 Apr 1980 Received: 27 Jul 1980 First Online: 02 Mar 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 1980 The Geological Society of America, Inc. GSA Bulletin (1980) 91 (11_Part_II): 2290–2431. https://doi.org/10.1130/GSAB-P2-91-2290 Article history Revision Received: 10 Mar 1980 Accepted: 08 Apr 1980 Received: 27 Jul 1980 First Online: 02 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 Stephen A. Nelson; Geology and Petrology of Volcan Ceboruco, Nayarit, Mexico. GSA Bulletin 1980;; 91 (11_Part_II): 2290–2431. doi: https://doi.org/10.1130/GSAB-P2-91-2290 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 Volcan Ceboruco is a moderately sized stratovolcanc located in the northwestern part of the Mexican Volcanic Belt. The bulk of the volcano consists of relatively alkali and incompatible element—poor hypersthene andesites erupted prior to the formation of two concentric calderas. These precaldera andesites were followed in the eruptive sequence by the eruption 1,000 yr ago of a white rhyodacite pumice, termed the Jala pumice. The eruption apparently caused the formation of Ceboruco's outer caldera. A low-silica dacite dome and lava flow were then erupted and partially filled this caldera. These dacites contain xenoliths of high-Al basalt that were apparently partially molten at the time of their inclusion, suggesting that the dacite magma formed as a result of magma mixing involving Jala pumice and basaltic magmas. The dacite dome later collapsed to form the inner caldera, and Ceboruco again erupted andesites. These postcaldera andesites contain both augite and hypersthene and are enriched in alkalis and incompatible elements relative to the precaldera andesites. Finally, between 1870 and 1875, rhyodacite lava flows were erupted during Ceboruco's only historic activity.Crystal fractionation models using both major and trace elements suggest that the 1870 dacites and the Jala pumice could have been derived from magma with postcaldera andesite composition. To determine the origin of the Ceboruco andesites, trace-element partial-melting models tested three possible sources: subducted oceanic crust in the eclogite facies and the amphibolite facies and mantle peridotite. All models were found unreliable because of the many assumptions involved. It is concluded that a complex process involving partial melting, fractional crystalization, magma mixing, and, perhaps, crustal assimilation was responsible for the generation of the andesites. Such a model cannot be tested, however, because there are at present no viable constraints that can be placed on this complex sequence of events. 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.