<?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>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742022000100027</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2022.1.1652</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Petrología y geoquímica de los Ortoneises aflorantes en los sectores central y este en el Macizo de Santander, Andes Colombianos]]></article-title>
<article-title xml:lang="en"><![CDATA[Petrology and geochemistry of the orthogneisses outcropping in the eastern and central regions in the Santander Massif, Colombian Andes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Ramírez]]></surname>
<given-names><![CDATA[Carlos Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rey-León]]></surname>
<given-names><![CDATA[Vanessa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Industrial de Santander Escuela de Geología ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Estado de Río de Janeiro Facultad de Geología ]]></institution>
<addr-line><![CDATA[Río de Janeiro ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>39</volume>
<numero>1</numero>
<fpage>27</fpage>
<lpage>42</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742022000100027&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742022000100027&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742022000100027&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los Ortoneises aflorantes en los sectores central y este en el Macizo de Santander, consisten en intercalaciones de neis hornbléndico, neis biotítico y neis cuarzo-feldespático, predominando las dos primeras variedades. En estos ortoneises aparecen lentes esporádicos de anfibolita. Los ortoneises son el resultado del emplazamiento sintectónico de granitoides en rocas de los Esquistos del Silgará, durante el pico metamórfico de esta unidad metasedimentaria. Se observan algunas diferencias estructurales y composicionales en los ortoneises de los sectores central y este; la foliación más desarrollada, se observa en el sector central y la presencia de moscovita, al parecer se restringe solo al sector este. Las características geoquímicas evidencian que los ortoneises del sector central son de composición granítica, mientras que, para los ubicados en el sector este, su composición varía entre granito y granodiorita. Estos ortoneises fueron formados en una margen continental activa. El contenido de Tierras raras (REE) en los ortoneises evidencian tres patrones diferentes de comportamiento: 1) Los ortoneises félsicos muestran un paulatino empobrecimiento en las REE ligeras (La-Sm) y un empobrecimiento en REE pesadas (Eu-Lu); 2) ortoneises con clara anomalía negativa en Eu* y 3) La anfibolita está muy empobrecida en REE ligeras y va incrementando el contenido de REE pesadas con ausencia de anomalía en Eu*. Las condiciones P-T de metamorfismo para los ortoneises del sector central fueron: T = 690-770 °C y P = 0.53-0.85 GPa, mientras que, en el este, la temperatura obtenida varía entre 680 y 693 °C. La ocurrencia, relaciones de campo entre los ortoneises estudiados con unidades metasedimentarias y las edades, son muy similares a la de los ortoneises aflorantes a lo largo de los Andes y el sureste de México, evidenciando un arco magmático desarrollado a lo largo del protomargen de Gondwana Occidental.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Orthogneisses outcropping in the central and eastern regions in the Santander Massif consist in interlayered of hornblende gneiss, biotite gneiss and quartzo-feldspathic gneiss. Biotite and hornblende gneisses are the predominant lithologies. In these orthogneisses, sporadic amphibolite lenses appear. The orthogneisses are the result of the synthectonic emplacement of granitoids in the rocks of the Silgará Schist Unit during the metamorphic peak of this meta-sedimentary unit. Some structural and compositional differences are observed in the orthogneisses of the central and eastern sectors; the most developed foliation is observed in the central sector and the presence of muscovite, apparently it is restricted only to the eastern sector. The geochemical characteristics show that the orthogneisses of the central sector are granitic in composition, while, for those located in the eastern sector, their composition varies between granite and granodiorite. These orthogneisses were formed on an active continental margin. According to rare earth elements - REE behavior the rocks displayed three geochemical trends: 1) The felsic orthogneisses are moderating depleted in Light Rare elements-LREE (La-Sm) and depleted in Heavy Rare Earth elements-HREE (Eu-Lu); 2) negative europium anomaly is typical for orthogneisses; 3) Amphibolite is depleted in LREE and slow increment of HREE without europium anomaly. P-T metamorphic conditions were estimated for the central region as T = 690-770 °C and P = 0.53-0.85 GPa whereas amphibolite from eastern region reached metamorphic thermal peak conditions at T = 680-693 °C. Occurrence, field relationship of studied orthogneisses respect to metasedimentary country rocks are very similar that those orthogneisses outcropping along the Andes and southeastern terranes of Mexico as result of magmatic arc developed along the western Gondwana protomargin.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ortoneis]]></kwd>
<kwd lng="es"><![CDATA[petrología]]></kwd>
<kwd lng="es"><![CDATA[geoquímica]]></kwd>
<kwd lng="es"><![CDATA[Macizo de Santander]]></kwd>
<kwd lng="es"><![CDATA[Andes Colombianos]]></kwd>
<kwd lng="en"><![CDATA[Orthogneiss]]></kwd>
<kwd lng="en"><![CDATA[petrology]]></kwd>
<kwd lng="en"><![CDATA[geochemistry]]></kwd>
<kwd lng="en"><![CDATA[Santander Massif]]></kwd>
<kwd lng="en"><![CDATA[Colombian Andes]]></kwd>
</kwd-group>
</article-meta>
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