Geochronology, geochemistry, and isotope compositions of Piaochi S-type granitic intrusion in the Qinling orogen, central China: Petrogenesis and tectonic significance

Research Article| June 01, 1974 Orbicular Rocks of the Sandia Mountains, New Mexico TOMMY B. THOMPSON; TOMMY B. THOMPSON 1Department of Earth Resources, Colorado State University, Fort Collins, Colorado 80521 Search for other works by this author on: GSW Google Scholar DAVID L. GILES DAVID L. GILES 2Nord Resources, Inc., 2300 Candelaria, N. E., Albuquerque, New Mexico 87107 Search for other works by this author on: GSW Google Scholar Author and Article Information TOMMY B. THOMPSON 1Department of Earth Resources, Colorado State University, Fort Collins, Colorado 80521 DAVID L. GILES 2Nord Resources, Inc., 2300 Candelaria, N. E., Albuquerque, New Mexico 87107 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1974) 85 (6): 911–916. https://doi.org/10.1130/0016-7606(1974)85<911:OROTSM>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 TOMMY B. THOMPSON, DAVID L. GILES; Orbicular Rocks of the Sandia Mountains, New Mexico. GSA Bulletin 1974;; 85 (6): 911–916. doi: https://doi.org/10.1130/0016-7606(1974)85<911:OROTSM>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 Orbicular rocks that occur within biotite-rich Precambrian granite of the Sandia Mountains in central New Mexico are of three types: (1) multishelled orbicules with alternating biotite- and plagioclase-rich shells, (2) plagioclase orbicules with or without a discontinuous biotite shell near the orbicule margin, and (3) orbicules with plagioclase cores surrounded by thin concentric bands of finely crystalline biotite alternating with plagioclase. Cores of the orbicules consist of fragments of biotite monzonite, plagioclase, or hornfels.Petrographic data on fragment reactions during orbicule formation, an aplite dikelet that cuts the orbicule zone, spacing of orbicule shells, and chemical analyses suggest that these orbicular rocks formed by reactions between xenoliths and magmatic fluids during crystallization of the granite. 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.

Hornfels

Xenolith

Quartz monzonite

10.1130/0016-7606(1974)85<911:orotsm>2.0.co;2

Cite

Citations (11)