Journal article
Southwestern Africa on the burner: Pleistocene carbonatite volcanism linked to deep mantle upwelling in Angola
Andrea Giuliani, Marc Campeny, Vadim S Kamenetsky, Juan Carlos Afonso, Roland Maas, Joan Carles Melgarejo, Barry P Kohn, Erin L Matchan, Jose Mangas, Antonio O Goncalves, Jose Manuel
Geology | GeoScienceWorld | Published : 2017
DOI: 10.1130/G39344.1
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..
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Awarded by Catalonia Government
Awarded by Spanish Government
Awarded by Australian Research Council
Funding Acknowledgements
This work was supported by the consolidated research groups SGR-444 and SGR-1661 of the Catalonia Government, the Spanish Government (research project number CGL2009-13758), the Society of Economic Geologists (Hugh E. McKinstry Fund), and the Australian Research Council (grants DE150100009 to Giuliani, DP130100257 to Kamenetsky, and DP160103502 to Afonso). We thank Jose Fortuna and Felipe Correia from Catanda village for their assistance during field work; Mark Kendrick, David Phillips, and Gareth Davies for informal reviews of an earlier version of this manuscript; and Louis Moresi, Ting Yang, and Mike Sandiford for insightful discussions. This manuscript was significantly improved by constructive reviews from Cynthia Ebinger, Phil Janney, and an anonymous reviewer, and the encouraging and helpful editorial handling of Dennis Brown. This is contribution 996 from the ARC Centre of Excellence for Core to Crust Fluid Systems (http://www.ccfs.mq.edu.au) and contribution 1171 in the GEMOC Key Centre (http://www.gemoc.mq.edu.au).