<?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>S0120-02832019000100097</article-id>
<article-id pub-id-type="doi">10.18273/revbol.v41nl-2019005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Química mineral de biotitas en neises de la Suite Metamórfica Rio Urubú aflorantes en la Serra Repartimento, Dominio Guiana Central en el Cratón Amazónico, Brasil: implicaciones petrogenéticas]]></article-title>
<article-title xml:lang="en"><![CDATA[Mineral chemistry of biotites in gneisses from the Rio Urubú Metamorphic Suite outcropping in the Serra Repartimento, Central Guyana Domain in the Amazonian Craton, Brazil: petrogenetic implications]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ballesteros-Camaro]]></surname>
<given-names><![CDATA[Carlos Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ríos-Guerrero]]></surname>
<given-names><![CDATA[Johanna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal do Amazonas Programa de Pós-graduação em Geociências ]]></institution>
<addr-line><![CDATA[Manaus ]]></addr-line>
<country>Brazil</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>97</fpage>
<lpage>116</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-02832019000100097&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-02832019000100097&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-02832019000100097&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Ortoneises del basamento Paleoproteorozoico, de composición granítica de la Suite Metamórfica Rio Urubú (SMRU), relacionados a el evento pos-transamazónico son de amplia distribución en el Dominio Guiana Central (DGC) en el Cratón Amazónico, noreste de Brasil. En este estudio, fue estudiada la petrografía, mineralogía y química de biotitas en neises de biotita-hornblenda pertenecientes a la SMRU. También fueron determinadas las condiciones de formación de estas biotitas y discutidas la importancia de estos minerales en términos petrogenéticos. Mediante los resultados de petrografía y de química mineral fueron clasificadas las biotitas en dos grupos distintos: 1) biotitas primarias clasificadas como Bt-IA, menos deformadas, de aspecto ígneo preservado y sin mayor orientación mineral y 2) biotitas primarias con tendencia a biotitas reequilibradas, con evidencia de deformación leve a moderada (Bt-IB), marcando la foliación de la roca y la estructura neísica, y siendo consistentes con los procesos tectono-metamórficos asociados a zonas de cizallamiento que afectaron el DGC. Los datos de microsonda electrónica muestran que los contenidos totales de Mg en biotitas menos deformadas (Bt-IA) son más altos, siendo clasificadas como biotitas magnesianas, mientras que las biotitas deformadas (Bt-IB) presentan contenidos mayores en Fe y siendo clasificadas como biotitas ferríreras. Resultados para biotitas estrictamente primarias indican que las rocas de la SMRU son asociadas a granitos provenientes de magmas tipo-I y afinidad geoquímica calco-alcalina, con temperaturas (T) de cristalizaron para estas biotitas entre 720°C - 760°C, con condiciones de fugacidad de oxígeno (fO2) de -12,71 y -13,66 y razones de Fe/ (Fe+Mg) &#8805; 0,50, mostrando una cristalización para estas rocas en el campo NNO, sugiriendo condiciones reductoras para el magma parental y también indicando una fuente típicamente de corteza para los magmas que dieron origen a esos granitos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Orthogneisses of the Paleoproteorozoic basement from the Rio Urubú Metamorphic Suite (RUMS), related to the post-transamazonic event, are widely distributed in the Central Guyana Domain (CGD) in the Amazonian Craton, northeastern Brazil. In this study, it was investigated the petrography, mineralogy and chemistry of biotites within the biotite-hornblende gneisses from the RUMS. It was also determined the formation conditions of these biotites and discuss the significance of these minerals in terms of petrogenesis. It can be classified through the results of petrography and mineral chemistry biotites into two distinct groups: 1) primary biotite classified as Bt-IA, less deformed, igneous appearance preserved and with no mineral orientation; 2) primary biotite with a tendency to re-equilibrated biotite, classified as Bt-IB, with low to moderate evidence of deformation and showing the main foliation of the rock and the gneissic structure, and being consistent with the tectono-metamorphic processes associated with shear zones that affected the CGD. Microprobe data show that the total Mg contents in less deformed biotite (Bt-IA) are higher, classified as Mg-biotites, while the deformed biotite (Bt-IB) presents higher Fe content and are classified as Fe-biotites. Results for strictly primary biotite indicate that the rocks of the RUMS are associated to granites originated from an I-type magma and calc-alkaline geochemical affinity, where these biotites crystallized at temperatures (T) de 720°C - 760°C, with oxygen fugacity (fO2) conditions of -12.71 and -13.66, Fe/(Fe + Mg) ratios &#8805; 0.50, showing crystallization for these rocks around the NNO buffer, suggesting reducing conditions for the parental magma and also indicating a typical crust source for the magmas that contributed to the formation of these granites.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Suite Metamórfica Rio Urubú]]></kwd>
<kwd lng="es"><![CDATA[Química mineral]]></kwd>
<kwd lng="es"><![CDATA[Biotita]]></kwd>
<kwd lng="es"><![CDATA[Fugacidad de oxígeno]]></kwd>
<kwd lng="es"><![CDATA[Magma parental]]></kwd>
<kwd lng="en"><![CDATA[Rio Urubú Metamorphic Suite]]></kwd>
<kwd lng="en"><![CDATA[Mineral chemistry]]></kwd>
<kwd lng="en"><![CDATA[Biotite]]></kwd>
<kwd lng="en"><![CDATA[oxygen fugacity]]></kwd>
<kwd lng="en"><![CDATA[Parental magma]]></kwd>
</kwd-group>
</article-meta>
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