<?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>S0120-02832021000300087</article-id>
<article-id pub-id-type="doi">10.18273/revbol.v43n3-2021004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evidencias de procesos de alteración hidrotermal en cuerpos ígneos del municipio de Pajarito, flanco este de la cordillera Oriental (Colombia)]]></article-title>
<article-title xml:lang="en"><![CDATA[Hydrothermal evidence in igneous intrusions in Pajarito, on the East flank of the Eastern Cordillera (Colombia)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Preciado]]></surname>
<given-names><![CDATA[Angélica Julieth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Durán-González]]></surname>
<given-names><![CDATA[Sofía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mariño-Martínez]]></surname>
<given-names><![CDATA[Jorge Eliecer]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Pedagógica y Tecnológica de Colombia Escuela de Ingeniería Geológica ]]></institution>
<addr-line><![CDATA[Sogamoso ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>43</volume>
<numero>3</numero>
<fpage>87</fpage>
<lpage>105</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-02832021000300087&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-02832021000300087&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-02832021000300087&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En el municipio de Pajarito (departamento de Boyacá - Colombia), en un área de 48 km2 y sobre el flanco este de la cordillera Oriental, aflora una serie de cuerpos intrusivos máficos, que regionalmente están orientados en dirección N-S y se hospedan en rocas sedimentarias de edad Cretácico inferior. De estos cuerpos se estudiaron seis intrusiones: cinco cuerpos laminares, definidos como intrusión 1 a intrusión 5, y un sexto cuerpo de mayor tamaño definido como Cuerpo Ígneo Principal (CIP). Estas rocas están dominadas por texturas faneríticas a porfídicas, con cristales de piroxeno y plagioclasa, y se encuentran intruyendo pelitas que en la zona de contacto con los intrusivos varían a metalimolitas y argilitas. Los datos de campo y petrográficos sugieren que estas intrusiones fueron alteradas por acción de soluciones hidrotermales que generaron como consecuencia del intercambio químico, texturas de reemplazamiento y dos asociaciones paragenéticas: la paragénesis sericita - pirita - calcita, relacionada a un pH entre neutro a ligeramente ácido; y la paragénesis calcita - clorita - epidota- actinolita asociada a zonas de pH neutro a básico. De igual forma, las soluciones hidrotermales podrían estar relacionadas con una hipotética mineralización, como producto del proceso de lixiviación y enriquecimiento de elementos metálicos a partir de su paso por los cuerpos ígneos, y su consecuente precipitación en una trampa geoquímica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In the locality of Pajarito (Boyacá Department - Colombia), in an area of 48 km2 and on the eastern flank of the Eastern Cordillera, a series of mafic intrusive bodies emerge, that are regionally oriented in a NS direction and are hosted in sedimentary rocks of Lower Cretaceous age. Six intrusions were studied of these bodies: five laminar bodies, defined as Intrusion 1 to Intrusion 5, and a sixth larger body defined as Main Igneous Body or &#8216;CIP&#8217; (by its acronym in Spanish). These rocks are dominated by phaneritic to porphyritic textures, with crystals of: pyroxene and plagioclase, and are found intruding pelites that, in the area of contact with the intrusives, vary to metalimolites and argillites. The field and petrographic data suggest that these intrusions were altered by the action of hydrothermal solutions that generated as a consequence of chemical exchange, replacement textures and two paragenetic associations: the sericite - pyrite - calcite paragenesis, related to a pH between neutral to slightly acid; and calcite - chlorite - epidote - actinolite paragenesis associated with areas of neutral to basic pH. Similarly, hydrothermal solutions could be related to a hypothetical mineralization, as a product of the process of leaching and enrichment of metallic elements from their passage through igneous bodies, and their consequent precipitation in a geochemical trap.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Petrografía]]></kwd>
<kwd lng="es"><![CDATA[Alteración hidrotermal]]></kwd>
<kwd lng="es"><![CDATA[Intrusiones]]></kwd>
<kwd lng="es"><![CDATA[Cuerpo ígneo]]></kwd>
<kwd lng="es"><![CDATA[Pajarito]]></kwd>
<kwd lng="en"><![CDATA[Petrography]]></kwd>
<kwd lng="en"><![CDATA[Hydrothermal alteration]]></kwd>
<kwd lng="en"><![CDATA[Intrusions]]></kwd>
<kwd lng="en"><![CDATA[Igneous body]]></kwd>
<kwd lng="en"><![CDATA[Pajarito]]></kwd>
</kwd-group>
</article-meta>
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