<?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>0188-6266</journal-id>
<journal-title><![CDATA[Acta universitaria]]></journal-title>
<abbrev-journal-title><![CDATA[Acta univ]]></abbrev-journal-title>
<issn>0188-6266</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Guanajuato, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-62662024000100151</article-id>
<article-id pub-id-type="doi">10.15174/au.2024.4156</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio de isótopos estables (&#948;D, &#948;18O) en líneas meteóricas locales y su relación con el agua termal-subterránea en la Cuenca Alta del Río Laja, Guanajuato, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Stable isotopes (&#948;D, &#948;18O) of local meteoric water lines and their relationship with thermal-groundwater in the Cuenca Alta del Río Laja basin, Guanajuato, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-González]]></surname>
<given-names><![CDATA[Lucía Magali]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Puy-Aquiza]]></surname>
<given-names><![CDATA[María Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[Yanmei]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Guanajuato División de Ingenierías ]]></institution>
<addr-line><![CDATA[Guanajuato ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guanajuato Departamento de Ingeniería en Minas, Metalurgia y Geología ]]></institution>
<addr-line><![CDATA[Guanajuato ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>34</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-62662024000100151&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-62662024000100151&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-62662024000100151&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se analizó la composición isotópica (&#948;18O y &#948;D) de la precipitación en tres estaciones al centro de la Cuenca Alta del Río Laja durante los años 2022 y 2023. Las regresiones de los datos dieron las siguientes ecuaciones de líneas meteóricas locales: precipitación 2022 &#948;D = 7.349 &#948;18O + 0.693 y precipitación 2023 &#948;D = 4.72 &#948;18O - 7.175. La línea meteórica local del 2022 es congruente con las líneas meteóricas mundial, mexicana y de la Cuenca de México. La línea meteórica local del 2023 refleja las condiciones del fenómeno meteorológico de El Niño, con composiciones isotópicas más pesadas. Las composiciones isotópicas de las aguas termales-subterráneas indican un origen meteórico, sin enriquecimiento en &#948;18O.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The isotopic composition (&#948;18O and &#948;D) of precipitation was analyzed in three stations in the central part of the Cuenca Alta del Río Laja basin during the years 2022 and 2023. Local precipitation follows the regressions: precipitation 2022 &#948;D = 7.349 &#948;18O + 0.693 and precipitation 2023 &#948;D = 4.72 &#948;18O - 7.175. The 2022 local meteoric water line is congruent with the global, the Mexican, and the basin of Mexico meteoric water lines. The 2023 local meteoric water line shows the El Niño signature with more positive delta values. The isotopic compositions of the thermal-groundwater suggest a meteoric origin without a significant &#948;18O enrichment.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Precipitación]]></kwd>
<kwd lng="es"><![CDATA[El Niño]]></kwd>
<kwd lng="es"><![CDATA[aguas termales]]></kwd>
<kwd lng="en"><![CDATA[Precipitation]]></kwd>
<kwd lng="en"><![CDATA[El Niño]]></kwd>
<kwd lng="en"><![CDATA[thermal waters]]></kwd>
</kwd-group>
</article-meta>
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