Portal de Periódicos da CAPES

Insights into the tectonomagmatic evolution of NW Mexico: Geochronology and geochemistry of the Miocene volcanic rocks from the Pinacate area, Sonora

2008; Geological Society of America; Volume: 120; Issue: 5-6 Linguagem: Inglês

10.1130/b26053.1

1943-2674

Jesús Roberto Vidal-Solano, Alain Demant, Francisco A. Paz-Moreno, Henriette Lapierre, María Amabel Ortega-Rivera, J. K. W. Lee,

Geology and Paleoclimatology Research

Research Article| May 01, 2008 Insights into the tectonomagmatic evolution of NW Mexico: Geochronology and geochemistry of the Miocene volcanic rocks from the Pinacate area, Sonora Jesús Roberto Vidal-Solano; Jesús Roberto Vidal-Solano * 1Departamento de Geología, Universidad de Sonora, Apdo. Postal 847, 83000 Hermosillo, Sonora, México and Pétrologie Magmatique, Université Paul Cézanne (Aix-Marseille 3), Case Courier 441, 13397 Marseille Cedex 20, France *E-mail: jrvidal@ciencias.uson.mx Search for other works by this author on: GSW Google Scholar Alain Demant; Alain Demant 2Pétrologie Magmatique, Université Paul Cézanne (Aix-Marseille 3), Case Courier 441, 13397 Marseille Cedex 20, France Search for other works by this author on: GSW Google Scholar Francisco A. Paz Moreno; Francisco A. Paz Moreno 3Departamento de Geología, Universidad de Sonora, Apdo. Postal 847, 83000 Hermosillo, Sonora, México Search for other works by this author on: GSW Google Scholar Henriette Lapierre; Henriette Lapierre 4Laboratoire de Géologie des Chaînes Alpines, UMR 5025, BP 53, 38041 Grenoble Cedex, France †Deceased Search for other works by this author on: GSW Google Scholar María Amabel Ortega-Rivera; María Amabel Ortega-Rivera 5Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, Apdo. Postal 1039, 83000 Hermosillo, Sonora, México Search for other works by this author on: GSW Google Scholar James K.W. Lee James K.W. Lee 6Department of Geological Sciences and Geological Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Jesús Roberto Vidal-Solano * 1Departamento de Geología, Universidad de Sonora, Apdo. Postal 847, 83000 Hermosillo, Sonora, México and Pétrologie Magmatique, Université Paul Cézanne (Aix-Marseille 3), Case Courier 441, 13397 Marseille Cedex 20, France Alain Demant 2Pétrologie Magmatique, Université Paul Cézanne (Aix-Marseille 3), Case Courier 441, 13397 Marseille Cedex 20, France Francisco A. Paz Moreno 3Departamento de Geología, Universidad de Sonora, Apdo. Postal 847, 83000 Hermosillo, Sonora, México Henriette Lapierre †Deceased 4Laboratoire de Géologie des Chaînes Alpines, UMR 5025, BP 53, 38041 Grenoble Cedex, France María Amabel Ortega-Rivera 5Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, Apdo. Postal 1039, 83000 Hermosillo, Sonora, México James K.W. Lee 6Department of Geological Sciences and Geological Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada *E-mail: jrvidal@ciencias.uson.mx Publisher: Geological Society of America Received: 01 Jun 2006 Revision Received: 30 Aug 2007 Accepted: 03 Oct 2007 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2008 Geological Society of America GSA Bulletin (2008) 120 (5-6): 691–708. https://doi.org/10.1130/B26053.1 Article history Received: 01 Jun 2006 Revision Received: 30 Aug 2007 Accepted: 03 Oct 2007 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Jesús Roberto Vidal-Solano, Alain Demant, Francisco A. Paz Moreno, Henriette Lapierre, María Amabel Ortega-Rivera, James K.W. Lee; Insights into the tectonomagmatic evolution of NW Mexico: Geochronology and geochemistry of the Miocene volcanic rocks from the Pinacate area, Sonora. GSA Bulletin 2008;; 120 (5-6): 691–708. doi: https://doi.org/10.1130/B26053.1 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 Miocene volcanic rocks in the Pinacate area, Sonora, record a progressive change in the source of magmatism induced by asthenospheric upwelling and lithospheric thinning. 40Ar/39Ar age data, mineral chemistry, and major- and trace-element contents allow the identification of two volcanic sequences: an oldest basaltic episode (ca. 20 Ma), and a middle Miocene (12–15.5 Ma) sequence that consists of mesa basalts with transitional alkali character, calc-alkaline dacites, and high-silica rhyolites evolving toward peral-kaline liquids. Sr, Nd, and Pb isotope ratios reveal different sources for the Miocene basalts. The easternmost basalts have signatures indicating a Precambrian lithospheric mantle source, while the westernmost tholeiitic to transitional basalts are related to mixing of lithospheric and asthenospheric mantle. Rhyolites are the result of fractional crystallization of transitional basalt magmas with slight contamination by Precambrian crust. Chemical modeling shows that peralkaline rhyolites are related to slightly higher assimilation during their residence in the upper crust but also to a change in the mantle source of the parent basalt. The evolution of the isotopic signatures in space and time indicates that: (1) the volcanic activity is located over a major lithospheric boundary, i.e., the western limit of the North American Craton; (2) the lithosphere was progressively thinned so that huge volumes of alkalic basalts could access the surface during the Quaternary, building the Pinacate Volcanic Field. Correlation between geochemical signatures and the tectonic evolution of the western margin of the North American Craton shows that a progressive change in the source of magmatism can be related to the development of a slab window during the Miocene. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.