<?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>S1794-61902020000100005</article-id>
<article-id pub-id-type="doi">10.15446/esrj.v24n1.63443</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Petrography, microthermometry, and isotopy of the gold veins from Vetas, Santander (Colombia)]]></article-title>
<article-title xml:lang="es"><![CDATA[Petrografía, microtermometria e isotopía de las vetas auríferas de Vetas, Santander (Colombia)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barbosa]]></surname>
<given-names><![CDATA[Sonia Rojas]]></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[Cramer]]></surname>
<given-names><![CDATA[Thomas]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Servicio Geológico Colombiano  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<volume>24</volume>
<numero>1</numero>
<fpage>5</fpage>
<lpage>18</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1794-61902020000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1794-61902020000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1794-61902020000100005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The gold mineralization located in Vetas, Santander, consists of auriferous quartz veins hosted in Bucaramanga gneiss rocks, intrusive Jurassic rocks, and intrusive to porphyritic Miocene rocks. This study identified four mineralizing events: (1). Sericite, carbonate (ankerite and calcite?), massive and microcrystalline quartz, sphalerite, adularia, albite, galena, thin pyrite, pyrrhotite, chalcopyrite. The age for this stage is 10.78 ±0.23Ma (Ar/Ar on sericite). (2). Molybdenite, magnetite with exsolution of ilmenite, As-pyrite, sphalerite, fine-grained pyrite and little chalcopyrite quartz with huge, feathery, fine mosaic, flamboyant and microcrystalline textures and, tourmaline and sericite. (3). Gold and tennantite associated with sphalerite, fine- and coarse-grained pyrite, As-pyrite, chalcopyrite like inclusions, and quartz with flamboyant, mosaic, massive and "comb" textures, and tourmaline. Stage 2 and 3 happened from 7.58 ±0.15 Ma to 6,89±0,41Ma (Ar/Ar on sericite). (4). Thick, thin, and pyrite with arsenic, hematite and microcrystalline quartz (forming breccia texture), and sericite. The age for this stage is 5.24 ±0.10 (Ar/Ar on sericite). Post-mineral: quartz comb, alunite, halloysite, kaolinite, and ferrum hydroxides. The stable isotopes, &#8706;18O, &#8706;D, and &#8706;34S and fluid inclusions analysis infer that fluids were producing a mixture of meteoric and magmatic fluids with low salinity and minimum trapping temperatures between 200°C to 390°C. The mineralogy association, and fluid inclusions, in the first event show characteristic of low sulfidation epithermal. The second stage was hottest and with more magmatic signature over printed an intermediate sulfidation system; show a little more salinity on the fluids and more mineralogical diversity, the third and four events, could show an evolution of this fluid, where it was cooling and impoverishing on metals. Two initials stages are contemporaneous with two magmatic Miocene pulses on the area: the first one of granodiorite composition 10, 9± 0.2 Ma (U/Pb zircon), and the other one rhyodacite with 8.4 ±0.2 y 9.0 ± 0.2 Ma.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La mineralización de oro ubicada en Vetas, Santander, consiste en vetas auríferas de cuarzo alojadas en rocas del gneis de Bucaramanga, rocas jurásicas intrusivas y rocas intrusivas porfiríticas miocenicas. Este estudio identificó cuatro eventos de mineralización: (1). Sericita, carbonato (ankerita y calcita?), cuarzo masivo y microcristalino, esfalerita, adularia, albita, galena, pirita delgada, pirrotita, calcopirita. La edad para esta etapa es 10.78 ± 0.23Ma (Ar / Ar en sericita). (2). Molibdenita, magnetita con exsolución de ilmenita, arsenopirita, esfalerita, pirita de grano fino un poco de calcopirita y cuarzo con textura plumosa, mosaico fino, flamboyante y microcristalino, turmalina y sericita. (3). Oro y tenantita asociados con esfalerita, pirita de grano fino y grueso, pirita de arsenopirita, calcopirita como inclusiones, y cuarzo con texturas flamboyante, mosaico, masiva y en "peine", y turmalina. Los eventos 2 y 3 ocurrieron entre los 7,58 ± 0,15 Ma a 6,89 ± 0,41Ma (Ar / Ar en sericita). (4). Pirita en cristales finos y gruesos con arsénico, hematita y cuarzo microcristalino (formando una textura brechosa), y sericita. La edad para este evento es de 5.24 ± 0.10 (Ar / Ar en sericita). El evento Post-mineral: peine de cuarzo, alunita, haloysita, caolinita e hidróxidos de hierro. Los isótopos estables, &#8706;18 O, &#8706;D y &#8706;34 S y el análisis de inclusiones de fluidos infieren que los fluidos fueron producto de una mezcla de fluidos meteóricos y magmáticos con baja salinidad y temperaturas de atrapamiento mínimas entre 200° C y 390° C. La asociación mineralogica y las inclusiones fluidas, en el primer evento, muestran características de un ambiente epitermal de baja sulfuración; el segundo evento más caliente presenta una firma magmática más prominente sobreimponiendo un sistema epitermal de intermedia sulfuración sobre el de baja sulfuración, con un poco más de salinidad en los fluidos y más diversidad mineralógica. Para el tercer y cuarto eventos muestran una evolución de este fluido, donde se enfría y se empobrece en metales. De acuerdo a las edades reportadas, los dos eventos iniciales son contemporáneos con dos pulsos magmáticos del Mioceno que fueron identificados en sectores circundantes del área, el primero de composición de granodiorita 10, 9 ± 0.2 Ma (circón U / Pb, Mantilla, et al. 2011), y el otro de riodoritas con 8.4 ± 0.2 y 9.0 ± 0.2 Ma.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[stable isotopes]]></kwd>
<kwd lng="en"><![CDATA[epithermal]]></kwd>
<kwd lng="en"><![CDATA[intermediate sulfidation]]></kwd>
<kwd lng="en"><![CDATA[gold mineralization]]></kwd>
<kwd lng="en"><![CDATA[fluids mixture]]></kwd>
<kwd lng="en"><![CDATA[Miocene]]></kwd>
<kwd lng="es"><![CDATA[Isótopos estables]]></kwd>
<kwd lng="es"><![CDATA[epitermal]]></kwd>
<kwd lng="es"><![CDATA[sulfuración intermedia]]></kwd>
<kwd lng="es"><![CDATA[mineralización aurífera]]></kwd>
<kwd lng="es"><![CDATA[mezcla de fluidos]]></kwd>
<kwd lng="es"><![CDATA[Mioceno]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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