Precambrian Gneisses from Northern Colombia, South America

Abstract

Research Article| September 01, 1969 Precambrian Gneisses from Northern Colombia, South America WILLIAM D MACDONALD; WILLIAM D MACDONALD State University of New York, Binghamton, New York Search for other works by this author on: GSW Google Scholar P. M HURLEY P. M HURLEY Massachusetts Institute of Technology, Cambridge, Massachusetts Search for other works by this author on: GSW Google Scholar GSA Bulletin (1969) 80 (9): 1867–1872. https://doi.org/10.1130/0016-7606(1969)80[1867:PGFNCS]2.0.CO;2 Article history received: 07 Feb 1969 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 WILLIAM D MACDONALD, P. M HURLEY; Precambrian Gneisses from Northern Colombia, South America. GSA Bulletin 1969;; 80 (9): 1867–1872. doi: https://doi.org/10.1130/0016-7606(1969)80[1867:PGFNCS]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 This note summarizes the geologic occurrence and age measurements of high-grade metamorphic rocks from northern Colombia. These rocks crop out on the northern flank of the Sierra Nevada de Santa Marta near the southern shore of the Caribbean Sea. The Rb-Sr ages are in the range 1400 ± m.y., confirming the geological deductions of Gansser (1955) on their Precambrian age. As part of an uplifted remnant of the Guayana Shield, these gneisses suggest a great northwestern extension of the Precambrian shield beneath the younger sedimentary rocks of the low-lying llanos (plains) into the folded and uplifted Andes of Venezuela and Colombia. These Precambrian rocks lie close to the probable northwestern limit of the South American Precambrian cratonic basement. 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.