Geology of the Alkaline Precambrian Rocks at Pajarito Mountain, Otero County, New Mexico

Research Article| November 01, 1968 Geology of the Alkaline Precambrian Rocks at Pajarito Mountain, Otero County, New Mexico VINCENT C KELLEY VINCENT C KELLEY Department of Geology, University of New Mexico, Albuquerque, New Mexico Search for other works by this author on: GSW Google Scholar Author and Article Information VINCENT C KELLEY Department of Geology, University of New Mexico, Albuquerque, New Mexico Publisher: Geological Society of America Received: 09 Apr 1968 Revision Received: 17 May 1968 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1968, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1968) 79 (11): 1565–1572. https://doi.org/10.1130/0016-7606(1968)79[1565:GOTAPR]2.0.CO;2 Article history Received: 09 Apr 1968 Revision Received: 17 May 1968 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 VINCENT C KELLEY; Geology of the Alkaline Precambrian Rocks at Pajarito Mountain, Otero County, New Mexico. GSA Bulletin 1968;; 79 (11): 1565–1572. doi: https://doi.org/10.1130/0016-7606(1968)79[1565:GOTAPR]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 Pajarito Mountain is an oval-shaped Laramide dome involving Permian carbonates and red beds with a core of Precambrian rocks. The melanocratic rocks of the core have until recently been thought to be a Tertiary intrusive and perhaps laccolithic. The Permian beds lie on the core rocks unconformably above marked soil profiles of weathering, and radiometric dating shows the Precambrian to be near 1170 m.y. The rocks are predominantly melanocratic types high in amphibole. Fine- to medium-grained syenite is the principal terrane. Locally it is granitized or invaded by a coarser-grained granitoid syenite, and both of these are very locally invaded or converted to hornblende syenite pegmatite. Although hornblende is the predominant amphibole, riebeckite is common, and locally in the pegmatite late-stage aegirine has formed and commonly replaces the hornblende or riebeckite. 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.