Age of Etendeka flood volcanism and associated intrusions in southwestern Africa

Research Article| July 01, 1996 Age of Etendeka flood volcanism and associated intrusions in southwestern Africa Paul R. Renne; Paul R. Renne 1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709 Search for other works by this author on: GSW Google Scholar Jonathan M. Glen; Jonathan M. Glen 1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709 Search for other works by this author on: GSW Google Scholar Simon C. Milner; Simon C. Milner 2Geological Survey of Namibia, P.O. Box 2168, Windhoek, Namibia Search for other works by this author on: GSW Google Scholar Andrew R. Duncan Andrew R. Duncan 3Department of Geological Sciences, University of Cape Town, Rondebosch 7700, South Africa Search for other works by this author on: GSW Google Scholar Author and Article Information Paul R. Renne 1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709 Jonathan M. Glen 1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709 Simon C. Milner 2Geological Survey of Namibia, P.O. Box 2168, Windhoek, Namibia Andrew R. Duncan 3Department of Geological Sciences, University of Cape Town, Rondebosch 7700, South Africa Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1996) 24 (7): 659–662. https://doi.org/10.1130/0091-7613(1996)024<0659:AOEFVA>2.3.CO;2 Article history First Online: 02 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 Paul R. Renne, Jonathan M. Glen, Simon C. Milner, Andrew R. Duncan; Age of Etendeka flood volcanism and associated intrusions in southwestern Africa. Geology 1996;; 24 (7): 659–662. doi: https://doi.org/10.1130/0091-7613(1996)024<0659:AOEFVA>2.3.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 SocietyGeology Search Advanced Search Abstract Detailed 40Ar/39Ar laser step-heating analyses of mineral separates from five volcanic units in Namibia and Angola and five intrusions in Namibia yield important geochronological data for the Etendeka igneous province. Ten plateau dates on plagioclase, hornblende, and biotite between 131.7 ± 0.7 and 132.3 ± 0.7 Ma were obtained, and a late syenite from the Messum intrusive complex yielded a slightly younger hornblende plateau date of 129.3 ± 0.7 Ma. Magnetostratigraphy of the volcanic rocks in three sections up to 700 m thick, laterally spanning more than 100 km, suggests that the flows record only two geomagnetic polarity reversals. Precise temporal coincidence with the Paraná flood volcanic province in South America indicates that Etendeka volcanism does not represent a significantly younger phase of magmatism that migrated from northwest to southeast over 10 m.y., as has recently been proposed. The duration of intrusive activity was at least 2–3 m.y. longer than recorded by volcanism, and its total duration awaits further constraints. 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.