<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742019000100110</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2019.1.988</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Nuevas edades U-Pb SHRIMP del Complejo Volcánico Agua de la Piedra, Provincia Magmática Somún Curá, Patagonia, Argentina]]></article-title>
<article-title xml:lang="en"><![CDATA[New U-Th-Pb SHRIMP ages of the Complejo Volcánico Agua de la Piedra, Provincia Magmática Somún Curá, Patagonia, Argentina]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salani]]></surname>
<given-names><![CDATA[Flavia M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Remesal]]></surname>
<given-names><![CDATA[Marcela B.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos]]></surname>
<given-names><![CDATA[João O.S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Buenos Aires FCEN Departamento de Ciencias Geológicas]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Western Australia Center of Exploration Targeting ]]></institution>
<addr-line><![CDATA[Perth WA]]></addr-line>
<country>Australia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>36</volume>
<numero>1</numero>
<fpage>110</fpage>
<lpage>124</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742019000100110&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742019000100110&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742019000100110&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Durante el Cenozoico, el Norte de la Patagonia Extraandina se caracterizó por un extenso magmatismo, principalmente Oligoceno (25-28Ma) y basáltico, el plateau de Somún Curá. Un estadio post meseta más joven está representado por distintos complejos volcánicos poligenéticos (Alta Sierra de Somún Curá, Sierra de Apas, Sierra de Telsen, Sierra de Talagapa, Sierra Pire Mahuida, y Sierra de Chacays) y centros monogenéticos menores (Trayén Niyeu, Cerro Dos Hermanos) desarrollados desde el Oligoceno tardío hasta el Mioceno. Hasta el presente el complejo Agua de la Piedra ha sido considerado un centro eruptivo post meseta. Este edificio volcánico está compuesto por flujos piroclásticos basales de composición traquítica, lavas y domos traquíticos y cantidades menores de riolita, culminando con flujos basálticos. La serie se caracteriza por su naturaleza alcalina y muestra una brecha composicional típica en el rango mesosilícico. La evolución inferida de las rocas básicas hasta los términos diferenciados traquitariolita habría estado controlada mediante el fraccionamiento temprano de olivina-clinopiroxeno y posteriormente por plagioclasa + cristalización de K-feldespato. Hay escasos datos geocronológicos de esta serie volcánica. Para determinar con precisión la edad de la secuencia bimodal, se realizaron análisis U-Pb (SHRIMP) en muestras seleccionadas de un flujo de lava de traquita (Puesto Navarrete; 32.32 +0.48 -0.98 Ma), que constituye el núcleo del Complejo, y de un flujo de riolita en el sector periférico (Puesto Suárez; 32.01 +0.51 -0.34 Ma). La facies basáltica fue fechada por la metodología K-Ar en 24.4 ± 0.9 Ma. En conjunto, las nuevas edades reubican el Complejo Volcánico Agua de la Piedra en el contexto evolutivo de la Provincia Magmática Somún Curá. A la luz de la nueva información geocronológica que se presenta es evidente que las rocas traquíticas y riolíticas se habrían formado en forma sincrónica o poco antes que el evento principal que formó la meseta mientras que las edades de las rocas basálticas evidencian una contemporaneidad con otros complejos volcánicos post meseta.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT During the Cenozoic, the northern extra-Andean Patagonia was characterized by an extensive magmatism, mainly Oligocene (25-28Ma) and basaltic, i.e. the Somún Curá plateau. Younger, post-plateau magmatism produces several polygenetic volcanic complexes (Alta Sierra de Somún Curá, Sierra de Apas, Sierra de Telsen, Sierra de Talagapa, Sierra Pire Mahuida, and Sierra de Chacays) and minor monogenetic centres (Trayén Niyeu Volcano, Dos Hermanos Hills), developed from Late Oligocene through Miocene times. Up to the present, the Agua de la Piedra Volcanic Complex has been considered a post-shield eruptive assemblage. This volcanic building is composed of basal pyroclastic flows of trachytic composition and lava flows and domes which span from trachyte and lesser amounts of rhyolite to late basaltic flows. The series is characterized by its alkaline composition and displays a typical compositional gap in the mesosilicic realm. The evolution from the basic rocks to the trachyterhyolite differentiates was controlled by early olivine-clinopyroxene fractionation and later by plagioclase + K feldspar crystallization. There are scarse geocronological data of this volcanic series. In order to precisely date the bimodal sequence, a trachyte lava flow (Puesto Navarrete; 32.32 +0.48-0.98Ma), which constitutes the core of the Complex, and another rhyolite flow (Puesto Suárez; 32.01 +0.51 -0.34 Ma) were selected to perform U-Pb Sensitive High Resolution Ion MicroProbe (SHRIMP) analyses. The basaltic facies was dated by K-Ar methodology at 24.4 ± 0.9 Ma. All in all, the ages pose new time constraints in the Agua de la Piedra Volcanic Complex within the evolutive context of the Somún Curá MagmaticProvince. The newgeochronological information obtained indicate that the trachytic and rhyolitic rocks would have formed synchronously or shortly before the main event that formed the plateau, while the ages of the basaltic rocks are bound to be coeval with other post plateau volcanic complexes.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Patagonia Extraandina]]></kwd>
<kwd lng="es"><![CDATA[Vulcanismo neógeno]]></kwd>
<kwd lng="es"><![CDATA[Agua de la Piedra]]></kwd>
<kwd lng="es"><![CDATA[Petrología-Geocronología]]></kwd>
<kwd lng="en"><![CDATA[Extra- Andean Patagonia]]></kwd>
<kwd lng="en"><![CDATA[Neogene volcanism]]></kwd>
<kwd lng="en"><![CDATA[Agua de la Piedra]]></kwd>
<kwd lng="en"><![CDATA[Petrology- Geocronology]]></kwd>
</kwd-group>
</article-meta>
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