<?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>S1026-87742018000300228</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2018.3.864</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Crustal structure of the eastern Acambay graben, Central Mexico, from integrated geophysical data]]></article-title>
<article-title xml:lang="es"><![CDATA[Estructura cortical de la parte oriental del graben de Acambay, centro de México, a partir de información geofísica integrada]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arzate]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lacan]]></surname>
<given-names><![CDATA[Pierre]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Corbo-Camargo]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arango-Galván]]></surname>
<given-names><![CDATA[Claudia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Félix-Maldonado]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pacheco]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León-Loya]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias ]]></institution>
<addr-line><![CDATA[ Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias ]]></institution>
<addr-line><![CDATA[ Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias ]]></institution>
<addr-line><![CDATA[Juriquilla Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Autónoma de Aguascalientes Centro de Ciencias del Diseño y de la Construcción ]]></institution>
<addr-line><![CDATA[Aguascalientes Ags.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>35</volume>
<numero>3</numero>
<fpage>228</fpage>
<lpage>239</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742018000300228&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742018000300228&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742018000300228&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The Acambay graben is a ~70 km long E-W seismically active structure located within the Trans-Mexican Volcanic Belt (TMVB). Quaternary volcanism has contributed to shaping the graben morphology and reported hydrothermal activity suggests the existence of potential geothermal reservoirs. Our work aims at providing information about the unstudied subsurface structure of the graben using magnetotelluric (MT) soundings, as well as gravity and aeromagnetic data as preliminary work for near-future integrated 3D approach. We analyzed the distribution of magnetic anomalies and its relation to faulting using total field (TFM) aeromagnetic digital charts E14 and F14 (https://www.gob.mx/sgm) and through the analysis of the tilt derivative of TFM. The gravity and magnetic horizontal derivatives provided complementary results to constrain the location of the main fault and to contrast the response of the Pastores and Acambay-Tixmadejé faults. For the subsurface interpretation, we present the results of a 25 km magnetotelluric (MT) profile across the eastern tip of the Acambay graben, oriented approximately perpendicular to the azimuth of the main ~E-W fault systems. The resulting resistivity model incorporates gravity and aeromagnetic coincident model profiles. Density and magnetic susceptibility models were constrained with field sample data, surface geology and with the resistivity structure obtained from the 2D inversion of the measured MT soundings. The dimensionality and electric strike of the 13 MT stations that compose the profile were analyzed for a period band of 0.01 to 100 s. The average electric azimuth obtained was 88.5°±10°, which was used to invert the rotated to the electric strike MT profile. The integrated geophysical model reveals important lithological contrasts at the northern and southern bounding faults of the graben. While the northern Acambay-Tixmadejé fault affects a resistive ground and is associated to a &gt;20 mGal gravity anomaly, the southern Pastores fault corresponds to a contrasting conductive zone with relatively low gravity anomaly (~5 mGal). In contrast, the magnetic anomaly shows the opposite behavior; at the Pastores fault the observed amplitude is of 400 nT while the amplitude across the Acambay-Tixmadejé fault is insignificant. The geophysical model shows that both the Acambay-Tixmadejé and Pastores faults have constant and opposite dipping angles of about 70°, defining a nearly symmetric graben structure. According to our results, the Acambay-Tixmadejé fault as well as the central graben fault system converge at a depth of ~18 km that is consistent with the depth of the seismogenic crustal layer.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El graben de Acambay es una estructura sísmicamente activa de ~70 km de longitud en dirección E-O, localizada en la Faja Volcánica Transmexicana (FVTM). El vulcanismo del Cuaternario ha contribuido a modelar la morfología del graben y la actividad hidrotermal reportada sugiere la existencia de potenciales reservorios geotérmicos. Nuestro trabajo tiene como finalidad proveer información acerca de la estructura subsuperficial del graben usando sondeos magnetotelúricos (MT), así como datos gravimétricos y aeromagnéticos, como un trabajo preliminar para un futuro enfoque integral 3D. Analizamos la distribución de las anomalías magnéticas y su relación con el fallamiento usando el campo aeromagnético total (CAT) de las cartas digitales E14 y F14 (https://www.gob.mx/sgm) y a través del análisis de la derivada de inclinación del CAT. Las derivadas horizontales de los campos gravitatorio y magnético proporcionaron resultados adicionales para constreñir la localización de la falla principal y para contrastar la respuesta de las fallas Pastores y Acambay-Tixmadejé. Para la interpretación del subsuelo, presentamos el resultado de un perfil magnetotelúrico de ~25 km que cruza el graben de Acambay en su límite oriental, aproximadamente perpendicular al azimut de los sistemas principales ~E-O. El modelo de resistividad resultante incorpora modelos de perfiles coincidentes de gravimetría y magnetometría. Los modelos de densidad y la susceptibilidad magnética fueron constreñidos con muestras de campo, geología superficial y con la estructura de resistividad obtenida a partir de la inversión 2D de los datos magnetotelúricos medidos. La dimensionalidad y el strike eléctrico de las 13 estaciones magnetotelúricas que componen el perfil fueron analizadas para un ancho de banda de 0.01 a 100 s. El azimut eléctrico promedio obtenido fue de 88.5°±10°, el cual fue utilizado para rotar los datos al strike eléctrico e invertir el perfil. El modelo geofísico integral revela importantes contrastes litológicos en las fallas que limitan el graben al norte y al sur. Mientras que la falla Acambay-Tixmadejé al norte afecta un subsuelo resistivo y está asociada a una anomalía de gravedad &gt;20 mGal, la falla Pastores al sur corresponde a una estructura contrastantemente conductiva con una anomalía de gravedad relativamente pequeña (~5 mGal). En contraste, la anomalía magnética muestra un comportamiento opuesto; en la falla Pastores la amplitud observada es de 400 nT, mientras que la amplitud a lo largo de la falla Acambay-Tixmadejé es insignificante. El modelo geofísico muestra que ambas fallas, Acambay-Tixmadejé y Pastores, tienen ángulos de buzamiento constante y opuesto de 70°, definiendo una estructura del graben casi simétrica. De acuerdo con nuestros resultados, la falla Acambay-Tixmadejé, así como el sistema de fallas de la porción central del graben, convergen a una profundidad de ~18 km, lo que es consistente con la profundidad de la capa cortical sismogénica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[magnetotelluric methods]]></kwd>
<kwd lng="en"><![CDATA[integrated geophysical data]]></kwd>
<kwd lng="en"><![CDATA[deep structure]]></kwd>
<kwd lng="en"><![CDATA[Acambay graben]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[método magnetotelúrico]]></kwd>
<kwd lng="es"><![CDATA[datos geofísicos integrados]]></kwd>
<kwd lng="es"><![CDATA[estructura profunda]]></kwd>
<kwd lng="es"><![CDATA[graben de Acambay]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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