<?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>S0120-02832019000100029</article-id>
<article-id pub-id-type="doi">10.18273/revbol.v41n1-2019002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Petrografía, geoquímica y geocronología U-Pb de las rocas volcánicas y piroclásticas de la Formación Noreán al NW del Macizo de Santander, Colombia]]></article-title>
<article-title xml:lang="en"><![CDATA[Petrography, geochemistry and U-Pb geochronology of volcanic and pyroclastic rocks of the Noreán Formation in the NW of the Santander Massif, Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa-Martínez]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arango]]></surname>
<given-names><![CDATA[María Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zapata-García]]></surname>
<given-names><![CDATA[Gilberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Servicio Geológico Colombiano  ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Tecnológica de Pereira Facultad de Ciencias Ambientales ]]></institution>
<addr-line><![CDATA[Pereira ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<volume>41</volume>
<numero>1</numero>
<fpage>29</fpage>
<lpage>54</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-02832019000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-02832019000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-02832019000100029&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las rocas volcánicas y piroclásticas de la Formación Noreán al NW del Macizo de Santander, consisten de lavas desde andesíticas hasta riolíticas y de tobas vítreas, líticas y cristalinas respectivamente. También hay diques y cuerpos hipoabisales principalmente andesíticos. Geoquímicamente las rocas volcánicas y piroclásticas exhiben semejanzas químicas, son de la serie calco-alcalina y presentan anomalías negativas de Nb, P y Ti y positivas de Pb, que sugieren una génesis relacionada con subducción. Los resultados geocronológicos por el método U-Pb en circón arrojaron edades de 192,4 ± 2,2 Ma en una lava de andesita basáltica, 184,9 ± 2,0 Ma en una lava andesítica y 175,9 ± 1,1 Ma en una lava riolítica, las cuales indican la ocurrencia de eventos volcánicos en la Formación Noreán desde el Jurásico Inferior hasta el Medio. Las herencias encontradas en los circones sugieren que el arco volcánico se emplazó en un basamento Meso-Neoproterozoico. La Formación Noréan representa un magmatismo de arco continental y es correlacionable con la Formación Saldaña y con las Vulcanitas de Pitalito del Valle Superior del Magdalena, con las unidades volcánicas jurásicas de la Sierra Nevada de Santa Marta y con la Formación La Quinta de la Serranía de Perijá.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The volcanic and pyroclastic rocks of the Norean Formation located to the NW of the Santander Massif, are composed by lavas that range from andesitic to rhyolitic, together with glass, lithic and crystal tuffs. Mainly andesitic dikes and hypabyssal bodies are also present. Geochemically, the volcanic and pyroclastic rocks exhibit chemical similarities, belong to the calc-alkaline series and have negative anomalies of Nb, P and Ti and a positive anomaly of Pb, suggesting a subduction-related genesis. LA-ICP-MS U-Pb zircon geochronology resulted in ages of 192.4 ± 2.2 Ma in a basaltic andesite, 184.9 ± 2.0 Ma in an andesitic lava and 175.9 ± 1.1 Ma in a rhyolitic lava, indicating the occurrence of volcanic events in this section of the Noreán Formation from the Lower to the Middle Jurassic. Zircon inheritance suggests that the volcanic arc was emplaced in a Meso-Neoproterozoic basement. The Noreán Formation represents a continental arc magmatism, and can be correlated with the Saldaña Formation and the Pitalito Volcanites of the Upper Magdalena Valley, with Jurassic volcanic units of the Sierra Nevada de Santa Marta and with La Quinta Formation in the Serranía de Perijá.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Jurásico Inferior a Medio]]></kwd>
<kwd lng="es"><![CDATA[geocronología U-Pb]]></kwd>
<kwd lng="es"><![CDATA[rocas volcano-sedimentarias]]></kwd>
<kwd lng="es"><![CDATA[Valle Medio del Magdalena]]></kwd>
<kwd lng="es"><![CDATA[Serranía de San Lucas]]></kwd>
<kwd lng="en"><![CDATA[Middle-Lower Jurassic]]></kwd>
<kwd lng="en"><![CDATA[U-Pb geochronology]]></kwd>
<kwd lng="en"><![CDATA[volcano-sedimentary rocks]]></kwd>
<kwd lng="en"><![CDATA[Middle Magdalena Valley]]></kwd>
<kwd lng="en"><![CDATA[San Lucas Ridge]]></kwd>
</kwd-group>
</article-meta>
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