<?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>S1026-87742015000300529</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Apatite fission-track thermochronology of Laramide plutonic rocks in northwestern Mexico: Distinguishing Basin and Range extension versus Gulf of California rifting]]></article-title>
<article-title xml:lang="es"><![CDATA[Termocronología de trazas de fisión en apatito de rocas plutónicas Laramídicas del noroeste de México: diferenciando extensión Basin and Range versus rifting del Golfo de California]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calmus]]></surname>
<given-names><![CDATA[Thierry]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bernet]]></surname>
<given-names><![CDATA[Matthias]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lugo-Zazueta]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hardwick]]></surname>
<given-names><![CDATA[Elizabeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendivil-Quijada]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Université Joseph Fourier Institut des Sciences de la Terre ]]></institution>
<addr-line><![CDATA[Grenoble ]]></addr-line>
<country>France</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,GEO Digital Imaging de México, S.A. de C.V  ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>32</volume>
<numero>3</numero>
<fpage>529</fpage>
<lpage>541</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742015000300529&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742015000300529&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742015000300529&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Resumen Presentamos resultados termocronológicos en apatitos de dos plutones Laramides del centro y del este de Sonora, México. En Sonora central, el batolito de Hermosillo se extiende a lo largo de relieves orientados N-S por 150 km aproximadamente. En el NE de Hermosillo, en el Cerro Bachoco, edades de trazas de fisión en apatito se ubican entre 14.7 y 8.1 Ma, con una distribución de longitud de trazas de fisión que indica un enfriamiento rápido a través de la zona de retención parcial. El plutón de la Sierra La Madera se encuentra en el este de Sonora, en la longitud 109°30', en la cercanía del escarpe oeste de la Sierra Madre Occidental. Las rocas intrusivas de la Sierra La Madera tienen un rango de edad de trazas de fisión entre 26.5 and 18.4 Ma, con un enfriamiento moderadamente rápido a través de la zona de retención parcial, lo cual también es sugerido por la modelación de historia térmica. Interpretamos el enfriamiento rápido del Mioceno tardío de las rocas del Cerro Bachoco como una respuesta a la exhumación tectónica provocada por la apertura del Golfo de California y el enfriamiento del plutón de la Sierra La Madera debido a su exhumación durante la tectónica extensional Basin and Range y de la erosión contemporánea. Los plutones de Sonora presentan respuestas térmicas y estructurales distintas controladas por la provincia extensional en la cual se encuentra y el marco geológico, principalmente el espesor de la cobertura volcánica o sedimentaria cenozoica. En la provincia extensional del Golfo, a lo largo de la costa de Sonora, co-existen edades de trazas de fisión asociados a la extensión Basin and Range y a la apertura del Golfo de California.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Abstract This study presents thermochronological results from two Laramide plutons of central and eastern Sonora, Mexico. In central Sonora, the Hermosillo batholith forms a ~ 150 km long N-S range, between Hermosillo and Santa Ana. Close to Hermosillo, in the Cerro Bachoco, apatite fission track ages range between 14.7 and 8.1 Ma, with mean track length characteristics of rapid cooling across the partial annealing zone. The Sierra La Madera pluton is located in eastern Sonora, close to the western escarpment of the Sierra Madre Occidental. Rocks of Sierra La Madera yielded apatite fission track ages between 26.5 and 18.4 Ma, with moderately rapid cooling through the partial annealing zone, which is also suggested by the thermal history modeling. We interpret the Late Miocene rapid cooling of Cerro Bachoco rocks as a result of tectonic exhumation triggered by the opening of the Gulf of California, and the Late Oligocene-Early Miocene cooling of the Sierra La Madera pluton as a consequence of tectonic exhumation and erosion during the Basin and Range extension. Laramide plutons of Sonora display distinct structural and thermal responses depending on the extensional province in which they are located, and on the geological framework, particularly the thickness of Cenozoic volcanic and sedimentary rocks overlying the intrusive rocks. Along the coast of Sonora, apatite fission track ages related to Basin and Range and Gulf of California opening coexist.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Fission-track]]></kwd>
<kwd lng="es"><![CDATA[Laramide]]></kwd>
<kwd lng="es"><![CDATA[Basin and Range]]></kwd>
<kwd lng="es"><![CDATA[Gulf of California]]></kwd>
<kwd lng="es"><![CDATA[denudation]]></kwd>
<kwd lng="en"><![CDATA[Trazas de fisión]]></kwd>
<kwd lng="en"><![CDATA[Laramide]]></kwd>
<kwd lng="en"><![CDATA[Basin and Range]]></kwd>
<kwd lng="en"><![CDATA[Golfo de California]]></kwd>
<kwd lng="en"><![CDATA[denudación]]></kwd>
</kwd-group>
</article-meta>
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