New way to map old sutures using deformed alkaline rocks and carbonatites

Abstract

Research Article| May 01, 2003 New way to map old sutures using deformed alkaline rocks and carbonatites Kevin Burke; Kevin Burke 1School of Geosciences, University of the Witwatersrand, Private Bag 3, Witwatersrand 2050, South Africa Search for other works by this author on: GSW Google Scholar Lewis D. Ashwal; Lewis D. Ashwal 1School of Geosciences, University of the Witwatersrand, Private Bag 3, Witwatersrand 2050, South Africa Search for other works by this author on: GSW Google Scholar Susan J. Webb Susan J. Webb 1School of Geosciences, University of the Witwatersrand, Private Bag 3, Witwatersrand 2050, South Africa Search for other works by this author on: GSW Google Scholar Author and Article Information Kevin Burke 1School of Geosciences, University of the Witwatersrand, Private Bag 3, Witwatersrand 2050, South Africa Lewis D. Ashwal 1School of Geosciences, University of the Witwatersrand, Private Bag 3, Witwatersrand 2050, South Africa Susan J. Webb 1School of Geosciences, University of the Witwatersrand, Private Bag 3, Witwatersrand 2050, South Africa Publisher: Geological Society of America Received: 29 Oct 2002 Revision Received: 06 Jan 2003 Accepted: 08 Jan 2003 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2003) 31 (5): 391–394. https://doi.org/10.1130/0091-7613(2003)031<0391:NWTMOS>2.0.CO;2 Article history Received: 29 Oct 2002 Revision Received: 06 Jan 2003 Accepted: 08 Jan 2003 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Kevin Burke, Lewis D. Ashwal, Susan J. Webb; New way to map old sutures using deformed alkaline rocks and carbonatites. Geology 2003;; 31 (5): 391–394. doi: https://doi.org/10.1130/0091-7613(2003)031<0391:NWTMOS>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 SocietyGeology Search Advanced Search Abstract By using a recent compilation of African alkaline igneous rocks and carbonatites, we show that nearly 90 % (28 of 32 occurrences) of nepheline syenite gneisses and deformed carbonatites are concentrated within known or inferred Proterozoic suture zones. Given the well-established intracontinental rift setting for these rocks and the likely continental collisional setting for their subsequent deformation, we suggest that deformed alkaline rocks and carbonatites (DARCs) represent the products of two well-defined parts of the Wilson cycle. DARCs mark the places where vanished oceans have opened and then closed. We further postulate that DARCs taken into the mantle lithosphere to ∼100 km depths at collision could provide source material for later alkaline magmatism. This possibility could account for the observation of recurrent alkaline magmatic activity over hundreds of million years in provinces such as that of southern Malawi. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.