<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222020000100104</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2020v72n1a071019</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Geología y estructura de las sierras de Guanajuato y Codornices, Mesa Central, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Geology and structure of Guanajuato and Codornices ranges, Mesa Central, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Río Varela]]></surname>
<given-names><![CDATA[Paola del]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nieto-Samaniego]]></surname>
<given-names><![CDATA[Ángel Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alaniz-Álvarez]]></surname>
<given-names><![CDATA[Susana A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ángeles-Moreno]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Escalona-Alcázar]]></surname>
<given-names><![CDATA[Felipe de Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pilar-Martínez]]></surname>
<given-names><![CDATA[Alexis del]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias ]]></institution>
<addr-line><![CDATA[Juriquilla Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Zacatecas Unidad Académica de Ciencias de la Tierra ]]></institution>
<addr-line><![CDATA[Zacatecas ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias ]]></institution>
<addr-line><![CDATA[Juriquilla Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>72</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222020000100104&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222020000100104&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222020000100104&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Para contribuir al conocimiento sobre la tectónica cenozoica del centro de México se consideró estudiar la estructura e historia del levantamiento de las sierras de Guanajuato y Codornices, ya que constituyen un elemento tectónico donde se expone a las rocas del Jurásico-Cretácico y que se encuentra elevado hasta a 700 m por encima de la cuenca El Bajío. El área de estudio es el límite entre la Mesa Central y la parte centro-septentrional de la Faja Volcánica Transmexicana, ubicándose en un lugar clave para estudiar la tectónica cenozoica del centro de México. En el área hay dos entidades orográficas: (1) la Sierra de Guanajuato y (2) la Sierra de Codornices. En conjunto, ambas sierras conforman el bloque levantado de una semifosa tectónica de edad Oligoceno-Eoceno, en la cual se ha desarrollado la cuenca de El Bajío. Compilando la cartografía geológica actual del área de estudio, se reconocieron 6 conjuntos litológicos que registran los eventos tectónicos principales: rocas Jurásico-Cretácicas, conglomerados eocénicos, rocas volcánicas y plutónicas del Ypresiano, rocas volcánicas del Rupeliano, rocas del Chattiano y rocas del Mioceno. Con esta información elaboramos 27 secciones geológicas, configurando un modelo integral de la geometría y distribución de unidades estratigráficas y fallas cenozoicas. Las rocas volcánicas del Ypresiano se encuentran únicamente en el sector NW del área de estudio como remanentes de una cubierta más extensa ya erosionada. Las rocas volcánicas del Rupeliano presentan una diferencia en su distribución: a lo largo del margen SW del área de estudio se depositaron rocas piroclásticas, mientras que a lo largo del frente NE se emplazaron grandes volúmenes de rocas volcánicas efusivas. La actividad de las fallas normales durante el Oligoceno y Mioceno migró del núcleo de la Sierra de Guanajuato hacia la cuenca El Bajío, imprimiéndole al frente SW de las sierras de Guanajuato y Codornices una forma escalonada con la parte más hundida hacia la cuenca El Bajío. En contraste, a todo lo largo del margen NE del área de estudio las fallas normales son escasas y no se aprecia bien definido un frente montañoso escarpado, sino una inclinación suave hacia el NE, imprimiéndole a toda el área la forma de un bloque basculado. Las sierras de Guanajuato y Codornices experimentaron tres grandes fases de levantamiento-exhumación: la primera en el Ypresiano-Bartoniano, la segunda en el Oligoceno y la tercera en el Mioceno, adquiriendo su configuración actual en esta última. El levantamiento relativo con respecto a la cuenca El Bajío fue siempre mayor en la Sierra de Guanajuato y menor en la Sierra de Codornices.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT To increase the knowledge of tectonic evolution of central Mexico during the Cenozoic, it was considered to study the structure and uplift history of the Guanajuato and Codornices ranges. They form a tectonic element, elevated up to 700 m relative to the El Bajío basin, and where the Jurassic-Cretaceous basement is exposed. The study area is the limit between the Mesa Central and the central-northern part of the Transmexican Volcanic Belt. It is located in a key place to study the Cenozoic tectonics of central Mexico. There are two important orographic entities in the study area: (1) the Sierra de Guanajuato and (2) the Sierra de Codornices. Together they form the raised block of an Oligocene-Eocene half-graben, which bounds the El Bajío basin. By compiling the geological maps of the study area, we recognized six lithologic groups: Jurassic-Cretaceous rocks, Eocene conglomerates, Ypresian volcanic and plutonic rocks, Rupelian volcanic rocks, Chattian rocks and Miocene rocks. With this information, we elaborated 27 geological sections, configuring a complete model of the geometry and distribution of stratigraphic units and Cenozoic faults. The Eocene volcanic rocks are only found in the NW sector of the study area as remnants of a more extensive and eroded cover. The Rupelian volcanic activity has a difference in its distribution: along the SW margin of the study area, pyroclastic rocks were deposited, while throughout the NE front large volumes of effusive volcanic rocks were emplaced. The Oligocene and Miocene activity of the normal faults occurred in successive phases forming the stepped configuration to the SW margin of the Sierras of Guanajuato and Codornices due to the migration of the active zones towards the basin. In contrast, normal faults are scarce and a steep mountainous front is not well defined along the entire NE front of the study area. In this part, the slopes gently dip towards the NE giving the whole area the shape of a tilted block. The Sierra de Guanajuato and the Sierra de Codornices experienced three major phases of uplift-exhumation: the first in the early-middle Eocene, the second in the Oligocene and the third in the Miocene, when acquired the current configuration. The relative rise with respect to El Bajío basin was always higher in the Sierra de Guanajuato and lower in the Sierra de Codornices.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[levantamiento-exhumación]]></kwd>
<kwd lng="es"><![CDATA[tectónica cenozoica]]></kwd>
<kwd lng="es"><![CDATA[Falla del Bajío]]></kwd>
<kwd lng="es"><![CDATA[Mesa Central de México]]></kwd>
<kwd lng="es"><![CDATA[Sierra de Guanajuato]]></kwd>
<kwd lng="en"><![CDATA[upload-exhumation]]></kwd>
<kwd lng="en"><![CDATA[Cenozoic tectonics]]></kwd>
<kwd lng="en"><![CDATA[El Bajío fault]]></kwd>
<kwd lng="en"><![CDATA[Mesa Central]]></kwd>
<kwd lng="en"><![CDATA[Guanajuato range]]></kwd>
</kwd-group>
</article-meta>
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