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Southwestern Africa on the burner: Pleistocene carbonatite volcanism linked to deep mantle upwelling in Angola

2017; Geological Society of America; Volume: 45; Issue: 11 Linguagem: Inglês

10.1130/g39344.1

1943-2682

Andrea Giuliani, Marc Campeny, Vadim S. Kamenetsky, Juan Carlos Afonso, Roland Maas, Joan Carles Melgarejo i Draper, Barry P. Kohn, Erin Matchan, José Mangas, António Olímpio Gonçalves, José Mánuel,

earthquake and tectonic studies

Research Article| August 17, 2017 Southwestern Africa on the burner: Pleistocene carbonatite volcanism linked to deep mantle upwelling in Angola Andrea Giuliani; Andrea Giuliani * 1School of Earth Sciences, The University of Melbourne, Parkville, VIC 3010, Australia2ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia3Department of Earth Sciences, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, Netherlands *E-mail: andrea.giuliani@unimelb.edu.au; andrea.giuliani@mq.edu.au Search for other works by this author on: GSW Google Scholar Marc Campeny; Marc Campeny 4Natural History Museum of Barcelona, 08003 Barcelona, Catalonia, Spain5Department Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, 08028 Barcelona, Catalonia, Spain Search for other works by this author on: GSW Google Scholar Vadim S. Kamenetsky; Vadim S. Kamenetsky 6School of Physical Sciences, University of Tasmania, Hobart, TAS 7001, Australia Search for other works by this author on: GSW Google Scholar Juan Carlos Afonso; Juan Carlos Afonso 2ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia7Centre for Earth Evolution and Dynamics, Department of Geosciences, University of Oslo, 0316 Oslo, Norway Search for other works by this author on: GSW Google Scholar Roland Maas; Roland Maas 1School of Earth Sciences, The University of Melbourne, Parkville, VIC 3010, Australia Search for other works by this author on: GSW Google Scholar Joan Carles Melgarejo; Joan Carles Melgarejo 5Department Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, 08028 Barcelona, Catalonia, Spain Search for other works by this author on: GSW Google Scholar Barry P. Kohn; Barry P. Kohn 1School of Earth Sciences, The University of Melbourne, Parkville, VIC 3010, Australia Search for other works by this author on: GSW Google Scholar Erin L. Matchan; Erin L. Matchan 1School of Earth Sciences, The University of Melbourne, Parkville, VIC 3010, Australia Search for other works by this author on: GSW Google Scholar José Mangas; José Mangas 8Department Física, Instituto de Oceanografía y Cambio Global, Universidad de Las Palmas de Gran Canaria, Campus Universitario de Tafira, 35017 Las Palmas de Gran Canaria, Spain Search for other works by this author on: GSW Google Scholar Antonio O. Gonçalves; Antonio O. Gonçalves 9Department Geologia, Universidade Agostinho Neto, 815 Luanda, Angola Search for other works by this author on: GSW Google Scholar José Manuel José Manuel 9Department Geologia, Universidade Agostinho Neto, 815 Luanda, Angola Search for other works by this author on: GSW Google Scholar Author and Article Information Andrea Giuliani * 1School of Earth Sciences, The University of Melbourne, Parkville, VIC 3010, Australia2ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia3Department of Earth Sciences, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, Netherlands Marc Campeny 4Natural History Museum of Barcelona, 08003 Barcelona, Catalonia, Spain5Department Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, 08028 Barcelona, Catalonia, Spain Vadim S. Kamenetsky 6School of Physical Sciences, University of Tasmania, Hobart, TAS 7001, Australia Juan Carlos Afonso 2ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia7Centre for Earth Evolution and Dynamics, Department of Geosciences, University of Oslo, 0316 Oslo, Norway Roland Maas 1School of Earth Sciences, The University of Melbourne, Parkville, VIC 3010, Australia Joan Carles Melgarejo 5Department Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, 08028 Barcelona, Catalonia, Spain Barry P. Kohn 1School of Earth Sciences, The University of Melbourne, Parkville, VIC 3010, Australia Erin L. Matchan 1School of Earth Sciences, The University of Melbourne, Parkville, VIC 3010, Australia José Mangas 8Department Física, Instituto de Oceanografía y Cambio Global, Universidad de Las Palmas de Gran Canaria, Campus Universitario de Tafira, 35017 Las Palmas de Gran Canaria, Spain Antonio O. Gonçalves 9Department Geologia, Universidade Agostinho Neto, 815 Luanda, Angola José Manuel 9Department Geologia, Universidade Agostinho Neto, 815 Luanda, Angola *E-mail: andrea.giuliani@unimelb.edu.au; andrea.giuliani@mq.edu.au Publisher: Geological Society of America Received: 22 May 2017 Revision Received: 18 Jul 2017 Accepted: 19 Jul 2017 First Online: 17 Aug 2017 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2017 Geological Society of America Geology (2017) 45 (11): 971–974. https://doi.org/10.1130/G39344.1 Article history Received: 22 May 2017 Revision Received: 18 Jul 2017 Accepted: 19 Jul 2017 First Online: 17 Aug 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Andrea Giuliani, Marc Campeny, Vadim S. Kamenetsky, Juan Carlos Afonso, Roland Maas, Joan Carles Melgarejo, Barry P. Kohn, Erin L. Matchan, José Mangas, Antonio O. Gonçalves, José Manuel; Southwestern Africa on the burner: Pleistocene carbonatite volcanism linked to deep mantle upwelling in Angola. Geology 2017;; 45 (11): 971–974. doi: https://doi.org/10.1130/G39344.1 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 The origin of intraplate carbonatitic to alkaline volcanism in Africa is controversial. A tectonic control, i.e., decompression melting associated with far-field stress, is suggested by correlation with lithospheric sutures, repeated magmatic cycles in the same areas over several million years, synchronicity across the plate, and lack of clear age progression patterns. Conversely, a dominant role for mantle convection is supported by the coincidence of Cenozoic volcanism with regions of lithospheric uplift, positive free-air gravity anomalies, and slow seismic velocities. To improve constraints on the genesis of African volcanism, here we report the first radiometric and isotopic results for the Catanda complex, which hosts the only extrusive carbonatites in Angola. Apatite (U-Th-Sm)/He and phlogopite 40Ar/39Ar ages of Catanda aillikite lavas indicate eruption at ca. 500–800 ka, more than 100 m.y. after emplacement of abundant kimberlites and carbonatites in this region. The lavas share similar high-μ (HIMU)–like Sr-Nd-Pb-Hf isotope compositions with other young mantle-derived volcanics from Africa (e.g., Northern Kenya Rift; Cameroon Line). The position of the Catanda complex in the Lucapa corridor, a long-lived extensional structure, suggests a possible tectonic control for the volcanism. The complex is also located on the Bié Dome, a broad region of fast Pleistocene uplift attributed to mantle upwelling. Seismic tomography models indicate convection of deep hot material beneath regions of active volcanism in Africa, including a large area encompassing Angola and northern Namibia. This is strong evidence that intraplate late Cenozoic volcanism, including the Catanda complex, resulted from the interplay between mantle convection and preexisting lithospheric heterogeneities. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.