<?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>0120-3630</journal-id>
<journal-title><![CDATA[Boletín de Ciencias de la Tierra]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. cienc. tierra]]></abbrev-journal-title>
<issn>0120-3630</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-36302025000100007</article-id>
<article-id pub-id-type="doi">10.15446/rbct.n57.114144</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Intrusivos de los Cerros San Cristóbal, La Virgen y Altillo (Lima - Perú): procesos petrogenéticos e implicancias locales en el Batolito de la Costa]]></article-title>
<article-title xml:lang="en"><![CDATA[Intrusive rocks of San Cristóbal, La Virgen, and Altillo Hills (Lima, Peru): petrogenetic processes and their local implications in the Coastal Batholith]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerrón-Sarcco]]></surname>
<given-names><![CDATA[John Franklin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Mayor de San Marcos Facultad de Ingeniería Geológica, Minera, Metalúrgica y Geográfica ]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</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>
<numero>57</numero>
<fpage>7</fpage>
<lpage>21</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-36302025000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-36302025000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-36302025000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Este estudio analizó los procesos petrogenéticos e implicancias locales de las rocas intrusivas en los cerros San Cristóbal, La Virgen y Altillo (Lima, Perú), pertenecientes a las Super Unidades Patap y Santa Rosa. Se realizo cartografiado geológico, y recolección de 23 muestras de rocas para análisis petrográfico, geoquímico y de Difracción de Rayos X. Los resultados confirmaron características regionales de las rocas ígneas, como alcalinidad, ambiente de subducción y tipo de arco magmático. Además, se interpretaron posibles procesos locales: 1) la Super Unidad Patap, formada por magmatismo oxidado en un ambiente de baja energía, presentó cristalización fraccionada, mezcla magmática y procesos neumatolíticos que generaron xenolitos con flogopitas; 2) la Super Unidad Santa Rosa, asociada a magmatismo reducido de alta energía, intensa asimilación cortical, nucleación rápida de cristales y emisión de fluidos hidrotermales, los cuales alteraron las rocas de la Super Unidad Patap, generando actinolita, clorita, epidota y trazas de pirita.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This study analyzed the petrogenetic processes and local implications of intrusive rocks in the San Cristóbal, La Virgen, and Altillo hills (Lima, Peru), belonging to the Patap and Santa Rosa Super Units. Geological mapping was conducted, along with the collection of 23 rock samples for petrographic, geochemical, and X-ray diffraction analysis. The results confirmed regional characteristics of igneous rocks, such as alkalinity, subduction environment, and magmatic arc type. Additionally, possible local processes were interpreted: (1) the Patap Super Unit, formed by oxidized magmatism in a low-energy environment, exhibited fractional crystallization, magma mixing, and pneumatolytic processes that produced xenoliths with phlogopite; (2) the Santa Rosa Super Unit, associated with reduced, high-energy magmatism, showed intense crustal assimilation, rapid crystal nucleation, and the release of hydrothermal fluids, which altered the rocks of the Patap Super Unit, forming actinolite, chlorite, epidote, and traces of pyrite.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Batolito de la Costa]]></kwd>
<kwd lng="es"><![CDATA[difracción de Rayos X]]></kwd>
<kwd lng="es"><![CDATA[geoquímica]]></kwd>
<kwd lng="es"><![CDATA[petrografía]]></kwd>
<kwd lng="es"><![CDATA[procesos petrogenéticos]]></kwd>
<kwd lng="es"><![CDATA[Super Unidad Patap]]></kwd>
<kwd lng="es"><![CDATA[Super Unidad Santa Rosa]]></kwd>
<kwd lng="en"><![CDATA[Coastal Batholith]]></kwd>
<kwd lng="en"><![CDATA[X-ray diffraction]]></kwd>
<kwd lng="en"><![CDATA[geochemistry]]></kwd>
<kwd lng="en"><![CDATA[petrography]]></kwd>
<kwd lng="en"><![CDATA[petrogenetic process]]></kwd>
<kwd lng="en"><![CDATA[Patap Super Unit]]></kwd>
<kwd lng="en"><![CDATA[Santa Rosa Super Unit]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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