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• W2053609247 abstract "Research Article| May 01, 1993 Influence of crustal thickening on arc magmatism:, Nevados de Payachata volcanic region, northern Chile Nancy J. McMillan; Nancy J. McMillan 1Department of Geological Sciences, New Mexico State University, Las Cruces, New Mexico 88003 Search for other works by this author on: GSW Google Scholar Jon P. Davidson; Jon P. Davidson 2Department of Earth and Space Sciences, University of California, Los Angeles, California 90024 Search for other works by this author on: GSW Google Scholar Gerhard Wörner; Gerhard Wörner 3Institut für Geowissenschaften, Universität Mainz, Postfach 3980, D-6500 Mainz, Germany Search for other works by this author on: GSW Google Scholar Russell S. Harmon; Russell S. Harmon 4Natural Environment Research Council Isotope Geoscience Laboratory, British Geological Survey,Keyworth, Nottingham NG12 5GG, England Search for other works by this author on: GSW Google Scholar Stephen Moorbath; Stephen Moorbath 5Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, England Search for other works by this author on: GSW Google Scholar Leopoldo Lopez-Escobar Leopoldo Lopez-Escobar 6Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile Search for other works by this author on: GSW Google Scholar Author and Article Information Nancy J. McMillan 1Department of Geological Sciences, New Mexico State University, Las Cruces, New Mexico 88003 Jon P. Davidson 2Department of Earth and Space Sciences, University of California, Los Angeles, California 90024 Gerhard Wörner 3Institut für Geowissenschaften, Universität Mainz, Postfach 3980, D-6500 Mainz, Germany Russell S. Harmon 4Natural Environment Research Council Isotope Geoscience Laboratory, British Geological Survey,Keyworth, Nottingham NG12 5GG, England Stephen Moorbath 5Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, England Leopoldo Lopez-Escobar 6Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1993) 21 (5): 467–470. https://doi.org/10.1130/0091-7613(1993)021<0467:IOCTOA>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Nancy J. McMillan, Jon P. Davidson, Gerhard Wörner, Russell S. Harmon, Stephen Moorbath, Leopoldo Lopez-Escobar; Influence of crustal thickening on arc magmatism:, Nevados de Payachata volcanic region, northern Chile. Geology 1993;; 21 (5): 467–470. doi: https://doi.org/10.1130/0091-7613(1993)021<0467:IOCTOA>2.3.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 Neogene through Pleistocene lava flows of the Nevados de Payachata region (lat 18°S) on the Altiplano of northern Chile fall into two discrete chemical groups defined by age and incompatible element concentrations. The Neogene suite (10.5-6.6 Ma) has trace element concentrations comparable to arc magmas erupted on thin crust in central Chile. Pleistocene lava flows (0.29-0 Ma) are enriched in incompatible elements relative to Neogene samples but have similar Sr, Nd, and Pb isotopic ratios. Incompatible element enrichment in mafic rocks reflects deep-crustal or subcrustal processes. Neogene volcanism in northern Chile immediately followed a period of intense crustal thickening. Uplift rates accelerated at ∼15 Ma, indicating that the thin-crust-type Neogene magmas actually traversed a thickened crust. The isotopic and trace element relations are the result of contamination of mantle-derived basalts in an upwardly growing lower-crustal interaction zone, defined to be the part of the lower crust at or above its solidus. Because the lower crust reaches postorogenic thermal equilibrium slowly, the lower-crustal interaction zone during Neogene magmatism had essentially the same thickness as it did prior to deformation. Thermal relaxation of the lower crust after thickening produced an upwardly growing column of crust near its solidus. Only 15 m.y. after crustal thickening did ascending, mantle-derived mafic magmas encounter previously unmelted, fertile crust near its solidus in the upper fringes of the interaction zone. Here the magmas were contaminated with incompatible element-enriched crustal melts, forming the parental magmas for the Pleistocene suite. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2053609247 title "Influence of crustal thickening on arc magmatism:, Nevados de Payachata volcanic region, northern Chile" @default.
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