<?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>S1026-87742015000300377</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Depositional facies and migration of the eruptive loci for Atexcac axalapazco (central Mexico): implications for the morphology of the crater]]></article-title>
<article-title xml:lang="es"><![CDATA[Facies de depósito y migración de focos eruptivos del axalapazco de Atexcac (centro de México): implicaciones para la morfología del cráter]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Rojas]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrasco-Núñez]]></surname>
<given-names><![CDATA[Gerardo]]></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 Qro.]]></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>377</fpage>
<lpage>394</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742015000300377&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742015000300377&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742015000300377&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Phreatomagmatic explosions produced an alternated stratified sequence of surge and fallout deposits that formed the Atexcac axalapazco in the eastern Mexican Volcanic Belt. We defined six different depositional facies based on variations in grain size, composition and depositional structures. The depositional facies defined in this study indicate that the Atexcac axalapazco was formed through phreatomagmatic, phreatic and magmatic explosions. The fluctuations on the availability of groundwater of a local aquifer allowed intermittent interaction with periodic injections of ascending magma bodies and resulted in explosions with different grades of efficiency in fragmentation. In some cases availability of groundwater was almost null, producing only magmatic explosions. The deposition of material of those defined facies was accompanied by ballistic blocks of different compositions (basaltic, limestone, andesitic, microdioritic, juvenile and altered rocks). Velocities of those blocks were modeled, resulting at infrasonic speed (~ 0.3 Mach). The compositions and directions of sampled ballistic blocks allowed us define three different explosive stages with various location zones inside the crater. The evolution of these likely explosive zones suggests a migration and alternation, and sometimes simultaneity of the explosive locus that originated the elongated and irregular morphology of actual crater.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Explosiones de tipo freático, freatomagmático y magmático produjeron una secuencia estratificada alternada de depósitos de oleada y caída que dieron lugar a la formación del axalapazco Atexcac, en la porción oriental del Cinturón Volcánico Mexicano. Se definieron seis tipos de facies basadas en variaciones del tamaño de grano, la composición y las estructuras deposicionales. Las facies deposicionales definidas en este estudio, indican que el axalapazco Atexcac fue formado a través de explosiones freatomagmáticas, freáticas y magmáticas que ocurrieron en diferentes sitios de explosión. Fluctuaciones en la disponibilidad de agua subterránea de un acuífero local, permitieron la interacción intermitente con inyecciones periódicas de cuerpos de magma ascendentes que resultaron en explosiones con diferentes grados de eficiencia en la fragmentación. En algunos casos, la disponibilidad de agua subterránea fue casi nula, produciendo únicamente explosiones magmáticas. La depositación de material de las facies fue acompañada por bloques balísticos de diferentes composiciones (basáltica, caliza, andesítica, microdiorítica, juvenil y rocas alteradas). Las velocidades a la que fueron expulsados estos bloques resultaron ser infrasónicas (~ 0.3 Mach). Las composiciones y direcciones de los bloques balísticos muestreados permitieron definir al menos tres etapas explosivas que muestran amplias zonas de localización de los focos eruptivos dentro del cráter. La evolución de esas probables zonas explosivas sugieren la migración y alternancia, y en algunas ocasiones, simultaneidad de focos explosivos que originaron la morfología elongada e irregular del cráter actual.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[maar volcanoes]]></kwd>
<kwd lng="en"><![CDATA[ballistic blocks]]></kwd>
<kwd lng="en"><![CDATA[eruptive locus migration]]></kwd>
<kwd lng="en"><![CDATA[depositional facies]]></kwd>
<kwd lng="es"><![CDATA[volcanes maar]]></kwd>
<kwd lng="es"><![CDATA[bloques balísticos]]></kwd>
<kwd lng="es"><![CDATA[migración del foco eruptivo]]></kwd>
<kwd lng="es"><![CDATA[facies deposicionales]]></kwd>
</kwd-group>
</article-meta>
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