<?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>1794-6190</journal-id>
<journal-title><![CDATA[Earth Sciences Research Journal]]></journal-title>
<abbrev-journal-title><![CDATA[Earth Sci. Res. J.]]></abbrev-journal-title>
<issn>1794-6190</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1794-61902023000300259</article-id>
<article-id pub-id-type="doi">10.15446/esrj.v27n3.102843</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Mineral chemistry in pegmatites from eastern Colombia: Genesis and Evolution]]></article-title>
<article-title xml:lang="es"><![CDATA[Génesis y evolución de pegmatitas en el oriente colombiano mediante química mineral]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora-Galindo]]></surname>
<given-names><![CDATA[Estefany Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Molano Mendoza]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales]]></surname>
<given-names><![CDATA[Milton Julián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sepúlveda]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Servicio Geológico Colombiano  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2023</year>
</pub-date>
<volume>27</volume>
<numero>3</numero>
<fpage>259</fpage>
<lpage>271</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1794-61902023000300259&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1794-61902023000300259&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1794-61902023000300259&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Pegmatites and granitic intrusives from eastern Colombia, belonging to the Guainía department, were studied to determine the generating magma type, as well as to assess the degree of magmatic fractionation and its relationship with the presence of Nb-Ta-bearing minerals (strategic minerals). To that end, 31 rock samples were studied; EPMA electronic microprobe analyses were conducted on apatite, biotite, garnet, microcline, muscovite, and tourmaline. The results from biotite, garnet, and tourmaline suggest that these rocks originated from a Fe-rich peraluminous melt. Moreover, content variation of Ba in microcline, Na in muscovite, Fe-Mg in biotite, and Mn-Sr in apatite, allowed the proposal of a magmatic evolutionary line for these rocks. Nb-Ta-bearing samples were present in the most fractionated rocks where tourmaline and garnet occurred, and thus, were proposed as possible indicators of strategic minerals.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se estudiaron pegmatitas e intrusivos graníticos del este de Colombia pertenecientes al departamento del Guainía para determinar el tipo de magma generador, su grado de fraccionamiento magmático y su relación con la presencia de minerales portadores de Nb-Ta (minerales estratégicos). Con este propósito, se estudiaron 31 muestras de rocas y se realizaron análisis con microsonda electrónica EPMA en apatito, biotita, granate, microclina, muscovita y turmalina. Los resultados obtenidos a partir de biotita, granate y turmalina sugieren que dichas rocas se generaron a partir de un magma peraluminoso rico en Fe. Además, la variación del contenido de Ba en la microclina, Na en la muscovita, Fe-Mg en la biotita, y Mn-Sr en el apatito permitió proponer una línea evolutiva magmática para estas rocas. Las muestras portadoras de Nb-Ta estaban presentes en las rocas más fraccionadas, donde se encontraron turmalina y granate, por lo que se propusieron como posibles indicadores de minerales estratégicos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Pegmatite]]></kwd>
<kwd lng="en"><![CDATA[magmatic fractionation]]></kwd>
<kwd lng="en"><![CDATA[strategic minerals]]></kwd>
<kwd lng="en"><![CDATA[mineral chemistry]]></kwd>
<kwd lng="es"><![CDATA[Pegmatita]]></kwd>
<kwd lng="es"><![CDATA[fraccionamiento magmático]]></kwd>
<kwd lng="es"><![CDATA[minerales estratégicos]]></kwd>
<kwd lng="es"><![CDATA[química mineral]]></kwd>
</kwd-group>
</article-meta>
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