<?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>S1026-87742019000100095</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2019.1.784</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Protolith age of the Altar and Carnero complexes and Late Cretaceous-Miocene deformation in the Caborca-Altar region of northwestern Sonora, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[La edad del protolito de los complejos Altar y Carnero y deformación Cretácico tardío-Mioceno en el área de Caborca-Altar, noroeste de Sonora, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jacobson]]></surname>
<given-names><![CDATA[Carl E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jacques-Ayala]]></surname>
<given-names><![CDATA[César]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barth]]></surname>
<given-names><![CDATA[Andrew P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García y Barragán]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pedrick]]></surname>
<given-names><![CDATA[Jane N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wooden]]></surname>
<given-names><![CDATA[Joseph L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Iowa State University Department of Geological and Atmospheric Sciences ]]></institution>
<addr-line><![CDATA[Ames IA]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Pennsylvania Department of Earth and Space Sciences ]]></institution>
<addr-line><![CDATA[West Chester PA]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[Hermosillo Son]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Indiana University Department of Earth Sciences ]]></institution>
<addr-line><![CDATA[Indianapolis IN]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,U.S. Geological Survey  ]]></institution>
<addr-line><![CDATA[Menlo Park CA]]></addr-line>
<country>USA</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>95</fpage>
<lpage>109</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742019000100095&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742019000100095&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742019000100095&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In the Caborca-Altar area of northwest Sonora, variably deformed and metamorphosed sedimentary and volcanic rocks crop out in a northwest-southeast-trending belt (El Batamote belt) at least 70 km long. We obtained detrital zircon U-Pb ages from two distinctive components of the belt near Altar, here termed the Altar complex and Carnero complex. Zircon ages for metasandstone and metaconglomerate matrix from the Altar complex indicate a Late Cretaceous maximum age of sedimentation, with at least part of the complex no older than 77.5 ± 2.5 (2&#963;). Pre-Cretaceous detrital zircons in the complex were derived largely from local sources, including Proterozoic basement, the Neoproterozoic-Cambrian miogeocline and the Jurassic arc. The detrital zircon ages and lithologic character of the Altar complex suggest correlation with the Escalante Formation, the uppermost unit of the Upper Cretaceous El Chanate Group. In contrast, one sample from the Carnero complex yielded a Middle Jurassic maximum depositional age and a detrital zircon age distribution like that of the Jurassic eolianites of the North American Cordillera. The Carnero complex may correlate with the Middle Jurassic Rancho San Martín Formation but could also be a metamorphosed equivalent of the Upper Jurassic Cucurpe Formation, Upper Jurassic to Lower Cretaceous Bisbee Group, or El Chanate Group derived by recycling of Jurassic erg sandstones. The Late Cretaceous age for the Altar complex protolith contradicts models that relate deposition of the entire El Batamote protolith to a basin formed by oblique slip along the Late Jurassic Mojave-Sonora megashear. Instead, the belt is best explained as an assemblage of Middle Jurassic to Upper Cretaceous formations deformed and locally metamorphosed beneath a northeast-directed Laramide thrust complex. Potassium-argon and 40Ar/39Ar ages confirm previous inferences that deformation of El Batamote belt occurred between the Late Cretaceous and late Eocene. A second phase of deformation, involving low-angle normal faults, occurred during and/or after intrusion of the ~22-21 Ma Rancho Herradura granodiorite.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En el área de Caborca-Altar, noroeste de Sonora, aflora una franja orientada noroeste-sureste de, cuando menos, 70 km de longitud, a la que se ha denominado franja El Batamote; esta franja está constituida por rocas sedimentarias e ígneas deformadas y metamorfizadas en grados muy variables. Obtuvimos edades de U-Pb de circones detríticos de dos componentes distintivos de la franja cercana a Altar que denominaremos complejo Altar y complejo Carnero. Edades obtenidas de circones de metareniscas y de la matriz de metaconglomerados del complejo Altar indican una edad máxima de sedimentación del Cretácico Tardío; al menos una parte del complejo no es mayor que 77.5 ± 2.5 (2&#963;). Circones pre-cretácicos del complejo se derivaron de fuentes locales, incluyendo el basamento proterozoico, el miogeoclinal neoproterozoico-cámbrico y el arco jurásico. Las edades de los circones detríticos y el carácter litológico del complejo Altar sugieren una correlación con la Formación Escalante, la unidad superior del Grupo El Chanate del Cretácico Tardío. En contraste, una muestra del complejo Carnero aportó circones que indican una edad máxima de depósito del Jurásico Medio y una distribución de edades semejante a las de las eolianitas jurásicas de la provincia Cordillerana de Norteamérica. El complejo Carnero puede correlacionarse con la Formación Rancho San Martín del Jurásico Tardío, pero podría ser también un equivalente metamórfico del Grupo Bisbee del Jurásico Tardío-Cretácico Temprano, o del Grupo El Chanate, derivados del reciclado de las areniscas de ergs jurásicos. La edad Cretácico Tardío del protolito del complejo Altar contradice los modelos que relacionan el depósito de todo el protolito de la franja El Batamote en una cuenca formada por deslizamiento oblicuo a lo largo de la megacizalla Mojave-Sonora del Jurásico Tardío. En su lugar, la franja se explica mejor como un conjunto de formaciones del Jurásico Medio al Cretácico Superior deformadas y localmente metamorfoseadas debajo de un complejo cabalgante laramídico dirigido hacia el noreste. Edades de potasio-argón y de 40Ar/39Ar confirman inferencias previas de que la deformación de la franja El Batamote ocurrió entre el Cretácico Tardío y el Eoceno tardío. Una segunda fase de deformación, que implicó fallas normales de bajo ángulo, ocurrió durante o después de la intrusión de la granodiorita del Rancho Herradura de ~22-21 Ma.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Altar complex]]></kwd>
<kwd lng="en"><![CDATA[Carnero complex]]></kwd>
<kwd lng="en"><![CDATA[El Batamote belt]]></kwd>
<kwd lng="en"><![CDATA[El Chanate Group]]></kwd>
<kwd lng="en"><![CDATA[Mojave-Sonora megashear]]></kwd>
<kwd lng="en"><![CDATA[Laramide orogeny]]></kwd>
<kwd lng="es"><![CDATA[complejo Altar]]></kwd>
<kwd lng="es"><![CDATA[complejo Carnero]]></kwd>
<kwd lng="es"><![CDATA[franja El Batamote]]></kwd>
<kwd lng="es"><![CDATA[Grupo El Chanate]]></kwd>
<kwd lng="es"><![CDATA[megacizalla Mojave-Sonora]]></kwd>
<kwd lng="es"><![CDATA[orogenia laramídica]]></kwd>
</kwd-group>
</article-meta>
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