Research Article| May 01, 1970 Macusanite Occurrence, Age, and Composition, Macusani, Peru VIRGIL E BARNES; VIRGIL E BARNES Bureau of Economic Geology, The University of Texas at Austin, Texas 78712 Search for other works by this author on: GSW Google Scholar GEORGE EDWARDS; GEORGE EDWARDS Shell Development Company, Houston, Texas 77001 Search for other works by this author on: GSW Google Scholar W. A McLAUGHLIN; W. A McLAUGHLIN Shell Development Company, Houston, Texas 77001 Search for other works by this author on: GSW Google Scholar IRVING FRIEDMAN; IRVING FRIEDMAN U.S. Geological Survey, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar OIVA JOENSUU OIVA JOENSUU The Marine Laboratory, University of Miami, Miami, Florida 33149 Search for other works by this author on: GSW Google Scholar Author and Article Information VIRGIL E BARNES Bureau of Economic Geology, The University of Texas at Austin, Texas 78712 GEORGE EDWARDS Shell Development Company, Houston, Texas 77001 W. A McLAUGHLIN Shell Development Company, Houston, Texas 77001 IRVING FRIEDMAN U.S. Geological Survey, Denver, Colorado 80225 OIVA JOENSUU The Marine Laboratory, University of Miami, Miami, Florida 33149 Publisher: Geological Society of America Received: 21 May 1969 Revision Received: 30 Jul 1969 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1970, 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 (1970) 81 (5): 1539–1546. https://doi.org/10.1130/0016-7606(1970)81[1539:MOAACM]2.0.CO;2 Article history Received: 21 May 1969 Revision Received: 30 Jul 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 VIRGIL E BARNES, GEORGE EDWARDS, W. A McLAUGHLIN, IRVING FRIEDMAN, OIVA JOENSUU; Macusanite Occurrence, Age, and Composition, Macusani, Peru. GSA Bulletin 1970;; 81 (5): 1539–1546. doi: https://doi.org/10.1130/0016-7606(1970)81[1539:MOAACM]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 Macusanite, originally believed to be a type of tektite because of its sculpture, is shown to be related to sillar of the Macusani region, Peru. K-Ar measurements establish identical Pliocene ages (4.2 m.y.) for macusanite and sillar and relate these deposits to the extensive ash flows of the southern Andes. These rocks are unique for glassy rocks in that lithium, boron, and arsenic contents are very high; cesium, rubidium, tellurium, fluorine, and tin are higher than normal; zinc, copper, chromium, and zirconium are lower than normal; and high-alumina minerals such as andalusite are present. 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.