<?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>S1026-87742025000200073</article-id>
<article-id pub-id-type="doi">10.22201/igc.20072902e.2025.2.1846</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[La estructura porosa de muestras superficiales del complejo volcánico Los Humeros, revelada a partir de imágenes de microscopía electrónica de barrido y de microtomografía de rayos X]]></article-title>
<article-title xml:lang="en"><![CDATA[Pore structure of surficial samples from Los Humeros volcanic complex, revealed from scanning electron microscopy and X-ray microtomography images]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vega]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosa-Maldonado]]></surname>
<given-names><![CDATA[Jonathan de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyna-Bustos]]></surname>
<given-names><![CDATA[Irving]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</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 Instituto de Geociencias ]]></institution>
<addr-line><![CDATA[ Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Ingeniería y Arquitectura ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Guerrero Escuela Superior de Ciencias de la Tierra ]]></institution>
<addr-line><![CDATA[Taxco El Viejo Guerrero]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>42</volume>
<numero>2</numero>
<fpage>73</fpage>
<lpage>92</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742025000200073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742025000200073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742025000200073&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La caracterización de la estructura porosa y la permeabilidad de las rocas volcánicas es importante en la investigación de yacimientos geotérmicos, hídricos y de hidrocarburos, así como para la gestión de riesgos volcánicos. El presente estudio tiene como objetivo contribuir a un mejor entendimiento del espacio poroso y la permeabilidad de las rocas volcánicas, utilizando como caso estudio muestras de rocas superficiales pertenecientes al complejo volcánico Los Humeros, el cual alberga un yacimiento geotérmico actualmente en explotación. Para la caracterización de las muestras se utilizan varias técnicas analíticas, tales como porosimetría, permeametría, difracción de rayos X y fluorescencia de rayos X. Para el estudio del espacio poroso y la permeabilidad, se utilizan imágenes de microscopía electrónica de barrido y microtomografía de rayos X. Los resultados obtenidos indican que, en las rocas volcánicas estudiadas, el efecto de tamaño o escala es más relevante que el uso de las diferentes técnicas empleadas para obtener la porosidad. Por otra parte, las permeabilidades medidas analíticamente revelan valores relativamente altos, cuya conectividad solo comienza a ser detectada a partir de resoluciones de 10 mm/voxel, lo cual corrobora los estudios previos. Esto último es de gran importancia ya que los resultados indican que gran cantidad de poros muy pequeños (&#8804; 10 mm/voxel, en este caso) contribuyen considerablemente al transporte de flujo de fluidos, consecuentemente al valor de la permeabilidad, lo cual puede tener consecuencias significantivas en la explotación del campo geotérmico Los Humeros.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Studies of pore structure and permeability in volcanic rocks are important in the research of geothermal, water, and hydrocarbon reservoirs, as well as for the management of volcanic risks. The present study aims to contribute to a better understanding of the pore space and permeability of volcanic rocks, using surficial rock samples from Los Humeros volcanic complex, which hosts a geothermal field, as a case study. For this, several experimental techniques are used for the samples&#8217; characterization, such as porosimetry, permeametry, X-ray diffraction, and X-ray fluorescence, whereas images of scanning electron microscopy and X-ray microtomography are used to study the pore space and permeability. The results indicate that, in the studied volcanic rocks, the effect of size or scale is more relevant than the use of different techniques to obtain porosity. On the other hand, the experimentally measured permeabilities reveal relatively high values, whose connectivity only begins to be detected from resolutions of 10 mm/voxel, which corroborates previous studies. This finding is of great importance as the results indicate that a significant number of small pores (&#8804; 10 mm/voxel, in this case) contribute considerably to fluid flow transport, and consequently to the permeability. All this has significant potential consequences for the exploitation of the Los Humeros geothermal field.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[porosidad]]></kwd>
<kwd lng="es"><![CDATA[permeabilidad]]></kwd>
<kwd lng="es"><![CDATA[campo geotérmico]]></kwd>
<kwd lng="es"><![CDATA[rocas volcánicas]]></kwd>
<kwd lng="es"><![CDATA[microtomografía de rayos X]]></kwd>
<kwd lng="es"><![CDATA[microscopía electrónica de barrido]]></kwd>
<kwd lng="es"><![CDATA[complejo volcánico Los Humeros]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[porosity]]></kwd>
<kwd lng="en"><![CDATA[permeability]]></kwd>
<kwd lng="en"><![CDATA[geothermal field]]></kwd>
<kwd lng="en"><![CDATA[volcanic rocks]]></kwd>
<kwd lng="en"><![CDATA[scanning electron microscopy]]></kwd>
<kwd lng="en"><![CDATA[X-ray microtomography]]></kwd>
<kwd lng="en"><![CDATA[Los Humeros volcanic complex]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
</kwd-group>
</article-meta>
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