Mantle seismic structure beneath the Kaapvaal and Zimbabwe Cratons

Research Article| June 01, 2004 Mantle seismic structure beneath the Kaapvaal and Zimbabwe Cratons Matthew J. Fouch; Matthew J. Fouch Department of Geological Sciences, Arizona State University, Tempe, AZ 85287, USA, e-mail: fouch@asu.edu Search for other works by this author on: GSW Google Scholar David E. James; David E. James Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA, e-mail: james@dtm.ciw.edu;vandecar@dtm.ciw.edu Search for other works by this author on: GSW Google Scholar John C. VanDecar; John C. VanDecar Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA, e-mail: james@dtm.ciw.edu;vandecar@dtm.ciw.edu Search for other works by this author on: GSW Google Scholar Suzan van der Lee; Suzan van der Lee Department of Geological Sciences, Northwestern University, Evanston, IL 60208, USA, e-mail: susan@earth.northwestern.edu Search for other works by this author on: GSW Google Scholar Kaapvaal Seismic Group Kaapvaal Seismic Group Search for other works by this author on: GSW Google Scholar Author and Article Information Matthew J. Fouch Department of Geological Sciences, Arizona State University, Tempe, AZ 85287, USA, e-mail: fouch@asu.edu David E. James Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA, e-mail: james@dtm.ciw.edu;vandecar@dtm.ciw.edu John C. VanDecar Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA, e-mail: james@dtm.ciw.edu;vandecar@dtm.ciw.edu Suzan van der Lee Department of Geological Sciences, Northwestern University, Evanston, IL 60208, USA, e-mail: susan@earth.northwestern.edu Kaapvaal Seismic Group Publisher: Geological Society of South Africa First Online: 07 Mar 2017 Online ISSN: 1996-8590 Print ISSN: 1012-0750 © 2003 Geological Society of South Africa South African Journal of Geology (2004) 107 (1-2): 33–44. https://doi.org/10.2113/107.1-2.33 Article history First Online: 07 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Matthew J. Fouch, David E. James, John C. VanDecar, Suzan van der Lee, Kaapvaal Seismic Group; Mantle seismic structure beneath the Kaapvaal and Zimbabwe Cratons. South African Journal of Geology 2004;; 107 (1-2): 33–44. doi: https://doi.org/10.2113/107.1-2.33 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 SocietySouth African Journal of Geology Search Advanced Search Abstract We present results of seismic tomography for a broad region of southern Africa using data from the seismic component of the Kaapvaal Project, a multinational, multidisciplinary experiment conducted in the late 1990s. Seismic images provide clear evidence of mantle structures that mimic the surface geology across the region and provide important constraints on subcrustal structure associated with Archean cratons. Specifically, a thick (~250 to 300km) mantle keel exists beneath the Kaapvaal craton; a slightly thinner (~225 to 250km) keel exists beneath the Zimbabwe craton and parts of the Archean Limpopo mobile belt. Mantle velocities lower than surrounding regions are evident across a broad swath beneath the surface expression of the Bushveld Complex, a ~2.05 Ga layered mafic intrusion. These reduced velocities may be due to mantle refertilization during intrusion of Bushveld magmas, or they may be caused by a thermal perturbation of more recent origin, perhaps related to the ~183 Ma Karoo magmatic event. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.