<?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>0120-0283</journal-id>
<journal-title><![CDATA[Boletín de Geología]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. geol.]]></abbrev-journal-title>
<issn>0120-0283</issn>
<publisher>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-02832023000300015</article-id>
<article-id pub-id-type="doi">10.18273/revbol.v45n3-2023001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Petrografía y geoquímica del intrusivo de Naiza, cordillera Cutucú, Ecuador]]></article-title>
<article-title xml:lang="en"><![CDATA[Petrography and geochemistry of the Naiza intrusive, Cordillera Cutucú, Ecuador]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero-Cóndor]]></surname>
<given-names><![CDATA[Christian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carranco-Andino]]></surname>
<given-names><![CDATA[Fausto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gramal-Aguilar]]></surname>
<given-names><![CDATA[Ana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cobos-Maldonado]]></surname>
<given-names><![CDATA[Nadeshka]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pazmiño-Aguiar]]></surname>
<given-names><![CDATA[Paola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Condoy-Guiracocha]]></surname>
<given-names><![CDATA[Darwin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Betancourt-Valdivieso]]></surname>
<given-names><![CDATA[Franz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Investigación Geológico y Energético  ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Central del Ecuador Facultad de Geología, Minas y Petróleos ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Escuela Politécnica Nacional Facultad de Geología y Petróleos ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>45</volume>
<numero>3</numero>
<fpage>15</fpage>
<lpage>36</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-02832023000300015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-02832023000300015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-02832023000300015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En los Andes ecuatorianos, el registro del magmatismo Jurásico aflora al sureste de la zona Subandina. Estas rocas intrusivas fueron agrupadas indiscriminadamente en el batolito de Zamora, que fue definido como un cinturón de rocas intrusivas de 100 km de largo y de tendencia N-S, considerado las raíces magmáticas de un arco continental metaluminoso, calco-alcalino de larga vida, datado en el Jurásico Inferior (180 a 162 Ma). Sin embargo, el batolito de Zamora y rocas sedimentarias contemporáneas fueron afectadas por múltiples intrusiones, las cuales tienen alto interés científico y económico debido a su estilo de mineralización. Recientemente, al noroeste de Indanza, en el sector de Naiza, un granitoide emplazado en rocas sedimentarias de la Formación Chapiza y volcánicas de la Formación Misahuallí fue datado en 148,34±1,65 Ma. El intrusivo Naiza es una cuarzomonzonita, compuesta por oligoclasa, andesina, microclina, cuarzo, biotita y hornblenda. Datos geoquímicos indican que este intrusivo tiene afinidad alcalina a calco-alcalina alta en K y carácter metalumínoso. Patrones de tierras raras muestran: enriquecimiento de LREE respecto a HREE, anomalías positivas de Rb y Th, anomalías negativas de Eu y Nb. Estos patrones son comunes en ambientes de arco magmático de margen continental. Anomalías positivas de Pb indican contaminación cortical. Las relaciones entre Y, La y Nb sugieren que este intrusivo se formó en un episodio tardío a postmagmático en un dominio intracontinental.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract On the Ecuadorian Andes, the Jurassic magmatism record outcrops extensively to the south of the Subandean Zone. These intrusive rocks have been grouped indiscriminately in the Zamora Batholith, defined as an N-S trend. The 100 km long intrusive rocks belt is considered magmatic roots of a long-lived, calc-alkaline, metaluminous continental arc dated to Lower Jurassic (180 to 162 Ma). However, the Zamora batholith and contemporaneous sedimentary rocks were affected by multiple intrusions, which have high scientific and economic interest due to their mineralization style. Recently, in northwest Indanza, in the Naiza sector, a granitoid emplaced in sedimentary rocks of the Chapiza Formation and volcanic rocks of the Misahuallí Formation, was dated at 148.34±1.65 Ma. The Naiza intrusive is a quartz-monzonite composed by plagioclase (oligoclase-andesine), feldspar (microcline), quartz, biotite, and hornblende. Geochemical data indicate that this intrusive has an alkaline to high K calc-alkaline affinity and metalluminic character. Rare earth patterns show enrichment of LREE concerning HREE. Positive anomalies of Rb, and Th, accompanied by negative anomalies of Eu, and Nb, are standard patterns in continental margin magmatic arc environments. Anomalies positive for Pb indicate cortical contamination. The Y, La, and Nb contents suggest that the Naiza intrusive corresponds to a late-post magmatic to a post-magmatic episode in an intra-continental domain.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Magmatismo Jurásico]]></kwd>
<kwd lng="es"><![CDATA[Zona subandina]]></kwd>
<kwd lng="es"><![CDATA[Indanza]]></kwd>
<kwd lng="es"><![CDATA[Ecuador]]></kwd>
<kwd lng="en"><![CDATA[Jurassic magmatism]]></kwd>
<kwd lng="en"><![CDATA[Subandean zone]]></kwd>
<kwd lng="en"><![CDATA[Indanza]]></kwd>
<kwd lng="en"><![CDATA[Ecuador]]></kwd>
</kwd-group>
</article-meta>
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