<?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>2007-8196</journal-id>
<journal-title><![CDATA[Epistemus (Sonora)]]></journal-title>
<abbrev-journal-title><![CDATA[Epistemus (Sonora)]]></abbrev-journal-title>
<issn>2007-8196</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Sonora, División de Ingeniería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-81962025000100102</article-id>
<article-id pub-id-type="doi">10.36790/epistemus.v19i38.354</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Primeras Investigaciones Geológicas de la Isla más Aislada en el Golfo de California: Isla San Pedro Mártir]]></article-title>
<article-title xml:lang="en"><![CDATA[First Geological Investigations of the Most Isolated Island in the Gulf of California: Isla San Pedro Mártir]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vidal Solano]]></surname>
<given-names><![CDATA[Jesús Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cota Burruel]]></surname>
<given-names><![CDATA[Andrea Paola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velderrain Rojas]]></surname>
<given-names><![CDATA[Luis Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Valencia]]></surname>
<given-names><![CDATA[Alejandra Marisela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Sonora Departamento de Geología ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Sonora Departamento de Geología ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Sonora Departamento de Geología ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Sonora Departamento de Ingeniería Civil y Minas ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<volume>19</volume>
<numero>38</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-81962025000100102&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-81962025000100102&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-81962025000100102&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Isla San Pedro Mártir se ubica en la parte central del Golfo de California, al este del límite de placas transformante Pacífico-Norteamérica. El primer estudio geológico realizado en este bloque rocoso y presentado en esta investigación muestra que las rocas que predominan en esta isla son de origen subvolcánico y forman cuerpos tabulares con bordes vítreos y brechoides, emplazados en la estratificación de depósitos piroclásticos de tipo surtseyano. El estudio petrográfico pone en evidencia una misma asociación mineral para todas las unidades, con presencia de fenocristales anfibol, plagioclasa, feldespato alcalino y, en menor cantidad, clinopiroxeno, en una matriz traquítica de microlitos de plagioclasa. La unidad de mayor extensión es denominada Dacita San Pedro Mártir y muestra evidencias físicas y mineralógicas de una inmiscibilidad magmática. Las asociaciones minerales muestran que todas las rocas estudiadas son de una composición félsica y pueden ser clasificadas como dacitas. Finalmente, las primeras investigaciones geológicas en esta isla permiten establecer su conformación ígnea de composición similar, que atestiguan el registro de un sistema de plomería magmática subvolcánico y volcánico relacionado al límite de placas oblicuo divergente.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Isla San Pedro Mártir is located in the central part of the Gulf of California, east of the Pacific-North America transform plate boundary. This research presents the first geological study of this rocky block, revealing that its predominant rocks are of subvolcanic origin. These rocks form tabular bodies with vitreous and brecciated edges, emplaced within the stratified of Surtseyan-type pyroclastic deposits. Petrographic analysis reveals a consistent mineral assemblage for all units, with the presence of amphibole, plagioclase, alkali feldspar phenocrysts, and, to a lesser extent, clinopyroxene, embedded in a trachytic matrix of plagioclase microlites. The most extensive unit, referred to as the San Pedro Mártir Dacite, exhibits both physical and mineralogical evidence of magmatic immiscibility. The mineral assemblage indicates that all the studied rocks are felsic in composition and can be classified as dacites. Finally, the first geological investigations on this island allow us to establish that the island is composed of igneous rocks of similar composition. This uniformity attests to the presence of a subvolcanic magmatic plumbing system related to the oblique divergent plate boundary.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Golfo de California]]></kwd>
<kwd lng="es"><![CDATA[isla volcánica]]></kwd>
<kwd lng="es"><![CDATA[rocas subvolcánicas]]></kwd>
<kwd lng="es"><![CDATA[Isla San Pedro Mártir]]></kwd>
<kwd lng="en"><![CDATA[Gulf of California]]></kwd>
<kwd lng="en"><![CDATA[volcanic island]]></kwd>
<kwd lng="en"><![CDATA[subvolcanic rocks]]></kwd>
<kwd lng="en"><![CDATA[Isla San Pedro Mártir]]></kwd>
</kwd-group>
</article-meta>
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