<?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>0016-7169</journal-id>
<journal-title><![CDATA[Geofísica internacional]]></journal-title>
<abbrev-journal-title><![CDATA[Geofís. Intl]]></abbrev-journal-title>
<issn>0016-7169</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geofísica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-71692024000300977</article-id>
<article-id pub-id-type="doi">10.22201/igeof.2954436xe.2024.63.3.1727</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Ruby Xenocrystals in Dacite from Central Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz Hernández]]></surname>
<given-names><![CDATA[Luis Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Escamilla-Casas]]></surname>
<given-names><![CDATA[José C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo Instituto de Ciencias Básicas e Ingeniería Área Académica de Ciencias de la Tierra y Materiales Mineral de la Reforma]]></institution>
<addr-line><![CDATA[ Hidalgo]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,leoh@uaeh.edu.mx  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2024</year>
</pub-date>
<volume>63</volume>
<numero>3</numero>
<fpage>977</fpage>
<lpage>988</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692024000300977&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692024000300977&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692024000300977&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The occurrence of 1-2 cm in diameter, anhedral xenocrystals of red corundum (ruby) in a dacitic lavaflow from central Mexico -in the state of Hidalgo- has been recorded. Geochemically, this dacite nearly resembles adakitic rock (SiO2=63.73 66.64 wt %), with low alumina contents (Al2O3=14.38 14.93 wt %), sodium (Na2O=3.29 3.57wt %) and titanium (TiO2=0.55 0.60 wt %), slightly peraluminous (A/ CNK=1.04 1.17) and moderately potassic (K2O=1.90-2.04 wt %; K2O/Na2O=0.53-0.62), with rare earth spectra enriched in light-rare earth elements (La/Yb)N=9.71 10.98. The origin of the dacite is linked to the early geological evolution of the eastern sector of the Trans-Mexican Volcanic Belt (TMVB) during the Miocene, and its provenance could be a melt of a basaltic and pelitic-sediments slab and magmatic differentiation that generated adakitic magma. The gem-type corundum could have resulted after the addition of refractory products disaggregated from the Precambrian basement, carried, and transported to the surface by ascending magma.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se consigna la ocurrencia de xenocristales anhedrales de corindón rojo (rubí) de 1-2 cm de diámetro, en un derrame lávico dacítico del centro de México (estado de Hidalgo). Geoquímicamente, la dacita presenta algunos rasgos de roca adakítica (SiO2=63.73 66.64 wt %), con bajo contenido en alúmina (Al2O3=14.38 14.93 wt %), sodio (Na2O=3.29 3.57 wt %) y titanio (TiO2=0.55 0.60 wt %), ligeramente peraluminosa (A/CNK=1.04 1.17) y medianamente potásica (K2O=1.90 2.04 wt %; K2O/Na2O=0.53 0.62), con espectros de tierras raras enriquecidos en tierras raras ligeras (La/Yb)N=9.71 10.98. El origen de la dacita está ligada a la evolución geológica temprana del sector oriental de la Faja Volcánica Transmexicana, durante el Mioceno, y podría provenir de la fusión de losa basáltica-sedimentos pelíticos y diferenciación magmática para constituir una lava adakítica. El corindón variedad gema sería el resultado de la incorporación de productos refractarios disgregados de basamento precámbrico, acarreados y transportados a la superficie por la lava en ascenso.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Ruby]]></kwd>
<kwd lng="en"><![CDATA[corundum]]></kwd>
<kwd lng="en"><![CDATA[dacite]]></kwd>
<kwd lng="en"><![CDATA[xenocrystals]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="en"><![CDATA[state of Hidalgo]]></kwd>
<kwd lng="es"><![CDATA[Rubí]]></kwd>
<kwd lng="es"><![CDATA[corindón]]></kwd>
<kwd lng="es"><![CDATA[dacita]]></kwd>
<kwd lng="es"><![CDATA[xenocristales]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="es"><![CDATA[estado de Hidalgo]]></kwd>
</kwd-group>
</article-meta>
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