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Mafic rocks of the Ordovician Famatinian magmatic arc (NW Argentina): New insights into the mantle contribution

2016; Geological Society of America; Volume: 128; Issue: 7-8 Linguagem: Inglês

10.1130/b31417.1

1943-2674

Pablo H. Alasino, César Casquet, R. J. Pankhurst, Carlos W. Rapela, Juán A. Dahlquist, Carmen Galindo, Mariano A. Larrovere, Clemente Récio, Scott R. Paterson, Ferrán Colombo Piñol, Edgardo G. Baldo,

earthquake and tectonic studies

Research Article| July 01, 2016 Mafic rocks of the Ordovician Famatinian magmatic arc (NW Argentina): New insights into the mantle contribution P.H. Alasino; P.H. Alasino † 1Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR)–Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Entre Ríos y Mendoza, 5301, Anillaco, La Rioja, Argentina2Instituto de Geología y Recursos Naturales, Centro de Investigación e Innovación Tecnológica, Universidad Nacional de La Rioja (INGeReN-CENIIT-UNLaR), Avenida Gobernador Vernet y Apostol Felipe, 5300, La Rioja, Argentina †palasino@crilar-conicet.gob.ar Search for other works by this author on: GSW Google Scholar C. Casquet; C. Casquet 3Departamento de Petrología y Geoquímica, Universidad Complutense, Instituto de Geociencias (CSIC-UCM), 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar R.J. Pankhurst; R.J. Pankhurst 4Visiting Research Associate, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK Search for other works by this author on: GSW Google Scholar C.W. Rapela; C.W. Rapela 5Centro de Investigaciones Geológicas (CIG), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)–Universidad Nacional de La Plata (UNLP), Calle 1 No. 644, 1900, La Plata, Argentina Search for other works by this author on: GSW Google Scholar J.A. Dahlquist; J.A. Dahlquist 6Centro de Investigaciones en Ciencias de la Tierra (CICTERRA). Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)-Universidad Nacional de Córdoba (UNC). Avenida Vélez Sarsfield 1611. Ciudad Universitaria X5016GCA, Argentina Search for other works by this author on: GSW Google Scholar C. Galindo; C. Galindo 3Departamento de Petrología y Geoquímica, Universidad Complutense, Instituto de Geociencias (CSIC-UCM), 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar M.A. Larrovere; M.A. Larrovere 1Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR)–Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Entre Ríos y Mendoza, 5301, Anillaco, La Rioja, Argentina2Instituto de Geología y Recursos Naturales, Centro de Investigación e Innovación Tecnológica, Universidad Nacional de La Rioja (INGeReN-CENIIT-UNLaR), Avenida Gobernador Vernet y Apostol Felipe, 5300, La Rioja, Argentina Search for other works by this author on: GSW Google Scholar C. Recio; C. Recio 7Laboratorio de Isótopos Estables, Edificio Multiusos I+D+i, Universidad de Salamanca, E-37007 Salamanca, Spain Search for other works by this author on: GSW Google Scholar S.R. Paterson; S.R. Paterson 8Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, USA Search for other works by this author on: GSW Google Scholar F. Colombo; F. Colombo 6Centro de Investigaciones en Ciencias de la Tierra (CICTERRA). Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)-Universidad Nacional de Córdoba (UNC). Avenida Vélez Sarsfield 1611. Ciudad Universitaria X5016GCA, Argentina Search for other works by this author on: GSW Google Scholar E.G. Baldo E.G. Baldo 6Centro de Investigaciones en Ciencias de la Tierra (CICTERRA). Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)-Universidad Nacional de Córdoba (UNC). Avenida Vélez Sarsfield 1611. Ciudad Universitaria X5016GCA, Argentina Search for other works by this author on: GSW Google Scholar Author and Article Information P.H. Alasino † 1Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR)–Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Entre Ríos y Mendoza, 5301, Anillaco, La Rioja, Argentina2Instituto de Geología y Recursos Naturales, Centro de Investigación e Innovación Tecnológica, Universidad Nacional de La Rioja (INGeReN-CENIIT-UNLaR), Avenida Gobernador Vernet y Apostol Felipe, 5300, La Rioja, Argentina C. Casquet 3Departamento de Petrología y Geoquímica, Universidad Complutense, Instituto de Geociencias (CSIC-UCM), 28040 Madrid, Spain R.J. Pankhurst 4Visiting Research Associate, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK C.W. Rapela 5Centro de Investigaciones Geológicas (CIG), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)–Universidad Nacional de La Plata (UNLP), Calle 1 No. 644, 1900, La Plata, Argentina J.A. Dahlquist 6Centro de Investigaciones en Ciencias de la Tierra (CICTERRA). Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)-Universidad Nacional de Córdoba (UNC). Avenida Vélez Sarsfield 1611. Ciudad Universitaria X5016GCA, Argentina C. Galindo 3Departamento de Petrología y Geoquímica, Universidad Complutense, Instituto de Geociencias (CSIC-UCM), 28040 Madrid, Spain M.A. Larrovere 1Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR)–Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Entre Ríos y Mendoza, 5301, Anillaco, La Rioja, Argentina2Instituto de Geología y Recursos Naturales, Centro de Investigación e Innovación Tecnológica, Universidad Nacional de La Rioja (INGeReN-CENIIT-UNLaR), Avenida Gobernador Vernet y Apostol Felipe, 5300, La Rioja, Argentina C. Recio 7Laboratorio de Isótopos Estables, Edificio Multiusos I+D+i, Universidad de Salamanca, E-37007 Salamanca, Spain S.R. Paterson 8Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, USA F. Colombo 6Centro de Investigaciones en Ciencias de la Tierra (CICTERRA). Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)-Universidad Nacional de Córdoba (UNC). Avenida Vélez Sarsfield 1611. Ciudad Universitaria X5016GCA, Argentina E.G. Baldo 6Centro de Investigaciones en Ciencias de la Tierra (CICTERRA). Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)-Universidad Nacional de Córdoba (UNC). Avenida Vélez Sarsfield 1611. Ciudad Universitaria X5016GCA, Argentina †palasino@crilar-conicet.gob.ar Publisher: Geological Society of America Received: 28 Aug 2015 Revision Received: 27 Jan 2016 Accepted: 01 Mar 2016 First Online: 02 Jun 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2016 Geological Society of America GSA Bulletin (2016) 128 (7-8): 1105–1120. https://doi.org/10.1130/B31417.1 Article history Received: 28 Aug 2015 Revision Received: 27 Jan 2016 Accepted: 01 Mar 2016 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation P.H. Alasino, C. Casquet, R.J. Pankhurst, C.W. Rapela, J.A. Dahlquist, C. Galindo, M.A. Larrovere, C. Recio, S.R. Paterson, F. Colombo, E.G. Baldo; Mafic rocks of the Ordovician Famatinian magmatic arc (NW Argentina): New insights into the mantle contribution. GSA Bulletin 2016;; 128 (7-8): 1105–1120. doi: https://doi.org/10.1130/B31417.1 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 SocietyGSA Bulletin Search Advanced Search Abstract We studied the petrogenesis of mafic igneous rocks in the Famatinian arc in the western Sierra Famatina (NW Argentina), an Early Ordovician middle-crustal section in the proto-Andean margin of Gondwana. Mafic rock types consist of amphibolite, metagabbro, and gabbro, as well as pod- and dike-like bodies of gabbro to diorite composition. Field relations together with geochemical and isotopic data for the mafic rocks of the western Sierra de Famatina (at 29°S) define two contrasting suites, which can be correlated with similar assemblages noted in other parts of the orogen. Amphibolite, metagabbro, and gabbro bodies are mostly the oldest intrusive rocks (older than 480 Ma), with the host tonalite and post-tonalite mafic dikes being slightly younger. The older mafic suite is tholeiitic to calc-alkaline and isotopically evolved, except for most of the amphibolite samples. The younger suite is calc-alkaline, typically displaying subduction-related geochemical signatures, and it is isotopically more juvenile. Whole-rock chemical composition and isotopic analyses are compatible with a progressive mixing of different isotopic reservoirs. Pyroxenite (±garnet) was likely the dominant source of the older gabbroic magmas, whereas peridotite dominated in the source of the younger suite, implying that the mafic magma experienced a progressive shift toward more juvenile compositions though time (over 20 m.y.). Pyroxenite-derived melts could have been generated by lithospheric foundering followed by upwelling of primitive melts by adiabatic decompression of mantle wedge peridotite. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.