Gross Brukkaros, A Probable Carbonatite Volcano in the Nama Plateau of Southwest Africa

Abstract

Research Article| April 01, 1969 Gross Brukkaros, A Probable Carbonatite Volcano in the Nama Plateau of Southwest Africa A. J. A JANSE A. J. A JANSE Research Institute of African Geology, Department of Earth Sciences, University of Leeds PRESENT ADDRESS: SELECTION TRUST EXPLORATION LIMITED, MASON'S AVENUE, COLEMAN STREET, LONDON, E. C. 2. Search for other works by this author on: GSW Google Scholar Author and Article Information A. J. A JANSE PRESENT ADDRESS: SELECTION TRUST EXPLORATION LIMITED, MASON'S AVENUE, COLEMAN STREET, LONDON, E. C. 2. Research Institute of African Geology, Department of Earth Sciences, University of Leeds Publisher: Geological Society of America Received: 18 Mar 1968 Revision Received: 13 Oct 1968 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1969, 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 (1969) 80 (4): 573–586. https://doi.org/10.1130/0016-7606(1969)80[573:GBAPCV]2.0.CO;2 Article history Received: 18 Mar 1968 Revision Received: 13 Oct 1968 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation A. J. A JANSE; Gross Brukkaros, A Probable Carbonatite Volcano in the Nama Plateau of Southwest Africa. GSA Bulletin 1969;; 80 (4): 573–586. doi: https://doi.org/10.1130/0016-7606(1969)80[573:GBAPCV]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 The large ring-shaped Mt. Brukkaros is formed by a dome of lower Paleozoic Nama sediments. In the center of the dome a depression 1.5miles in diameter is underlain and surrounded by fine-grained, layered, clastic rocks (microbreccias) derived from brecciation of the Nama sediments and shales. In the surrounding country rocks, 45 satellite vents and numerous radial dikes occur; they are filled with coarse breccias in a carbonate-rich matrix. This structure is the result of phreatic eruptions of a volatile-rich alkaline ultrabasic intrusion meeting water-soaked sediments. The Brukkaros complex is interpreted as a carbonatite volcano in an incipient stage. 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.