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Fingerprints of late Neoproterozoic ridge subduction in the Pan-African Damara belt, Namibia

2014; Geological Society of America; Volume: 42; Issue: 10 Linguagem: Inglês

10.1130/g35932.1

1943-2682

Francesca Meneghini, Alex Kisters, I. S. Buick, Åke Fagereng,

earthquake and tectonic studies

Research Article| October 01, 2014 Fingerprints of late Neoproterozoic ridge subduction in the Pan-African Damara belt, Namibia Francesca Meneghini; Francesca Meneghini 1Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland 7602, Stellenbosch, South Africa *Current address: Departamento de Geologia, Campus do Morro do Cruzeiro, Universidade Federal de Ouro Preto, Ouro Preto MG 35400-000, Brazil; E-mail: fmeneghini73@gmail.com. Search for other works by this author on: GSW Google Scholar Alex Kisters; Alex Kisters 1Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland 7602, Stellenbosch, South Africa Search for other works by this author on: GSW Google Scholar Ian Buick; Ian Buick 1Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland 7602, Stellenbosch, South Africa Search for other works by this author on: GSW Google Scholar Åke Fagereng Åke Fagereng 2Department of Geological Sciences, University of Cape Town, Private Bag X3, Rondebosch 7701, Cape Town, South Africa Search for other works by this author on: GSW Google Scholar Author and Article Information Francesca Meneghini *Current address: Departamento de Geologia, Campus do Morro do Cruzeiro, Universidade Federal de Ouro Preto, Ouro Preto MG 35400-000, Brazil; E-mail: fmeneghini73@gmail.com. 1Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland 7602, Stellenbosch, South Africa Alex Kisters 1Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland 7602, Stellenbosch, South Africa Ian Buick 1Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland 7602, Stellenbosch, South Africa Åke Fagereng 2Department of Geological Sciences, University of Cape Town, Private Bag X3, Rondebosch 7701, Cape Town, South Africa Publisher: Geological Society of America Received: 29 May 2014 Revision Received: 23 Jul 2014 Accepted: 28 Jul 2014 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2014 Geological Society of America Geology (2014) 42 (10): 903–906. https://doi.org/10.1130/G35932.1 Article history Received: 29 May 2014 Revision Received: 23 Jul 2014 Accepted: 28 Jul 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Francesca Meneghini, Alex Kisters, Ian Buick, Åke Fagereng; Fingerprints of late Neoproterozoic ridge subduction in the Pan-African Damara belt, Namibia. Geology 2014;; 42 (10): 903–906. doi: https://doi.org/10.1130/G35932.1 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 Subduction of mid-ocean ridges is a common feature in recent convergent margins, but is rarely documented in Proterozoic to Paleozoic orogenic belts. Here we describe evidence for ridge-trench interaction in the deeply eroded late Neoproterozoic Damara orogenic belt, central Namibia. The earliest interaction is indicated by primary intrusive contacts between amphibolite facies mid-ocean ridge metabasalts and trench metasediments. U-Pb zircon ages of 550–540 Ma from syntectonic granites in the forearc indicate the timing of partial melting and mafic underplating of the prism in response to ridge subduction. The thermal peak in the Damara belt, associated widespread granitic and alkalic plutonism, and hydrothermal activity coincide with the waning stages of tectonism at 530–520 Ma and are interpreted to indicate slab window widening and slab delamination. We suggest that the proposed two-stage thermal evolution of the Damara belt, comprising latest Neoproterozoic ridge subduction and early Cambrian slab delamination, represents a fingerprint of ridge subduction in ancient orogens. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.