<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222020000300006</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2020v72n3a201219</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Geochemistry of Platinum-Group Elements (PGE) in Cerro Matoso and Planeta Rica Ni-Laterite deposits, Northern Colombia]]></article-title>
<article-title xml:lang="es"><![CDATA[Geoquímica de los Elementos del Grupo del Platino (EGP) en los depósitos lateríticos de Ni de Cerro Matoso y Planeta Rica, Norte de Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tobón]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Weber]]></surname>
<given-names><![CDATA[Marion]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Proenza]]></surname>
<given-names><![CDATA[Joaquín A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aiglsperger]]></surname>
<given-names><![CDATA[Thomas]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Betancur]]></surname>
<given-names><![CDATA[Sebastián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Farré-de-Pablo]]></surname>
<given-names><![CDATA[Júlia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pujol-Solà]]></surname>
<given-names><![CDATA[Núria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Minas Departamento de Materiales y Minerales]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universitat de Barcelona Departament de Mineralogia, Petrologia i Geologia Aplicada ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Luleå University of Technology Department of Civil Engineering and Natural Resources ]]></institution>
<addr-line><![CDATA[Luleå ]]></addr-line>
<country>Sweden</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>72</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222020000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222020000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222020000300006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Platinum-group elements (PGE) are included among the so-called critical metals, and are essential metals for the technological industry. However, there are very few deposits in the world from which these metals can be extracted. The present work investigates three Ni-laterite profiles (hydrous Mg silicate type) formed over the ultramafic rocks of Cerro Matoso and Planeta Rica in Colombia. The main goal is to determine their PGE concentration and distribution, as well as to identify the carrier phases of these noble metals. The highest PGE contents in Cerro Matoso and Planeta Rica are concentrated in the limonite horizon (141-272 ppb), showing a strong decrease towards the saprolite and the underlying serpentinized peridotite (parent rock; &lt; 50 ppb). The highest concentrations correspond to Pt&gt;Ru&gt;Pd and the lowest to Rh&lt;Os&lt;Ir. Such distribution indicates that PGE are mobilized in different proportions by the laterization processes. The high affinity between PGE and Fe favors the formation of PGE-Fe mineral alloys such as the Pt-Ir-Fe-Ni minerals hosted by Fe-oxyhydroxide found in the limonite-saprolite transition zone in Planeta Rica. In addition, in the same zone, nanoparticles of Pt (&lt; 1 µm) were found within framboidal pyrite. Both types of platinum group minerals (PGM) are secondary in origin. In the case of Pt-Ir-Fe-Ni alloys, this interpretation is supported by their morphology and chemical composition, which is comparable with PGE-Fe-Ni alloys found in laterites of Dominican Republic. In the case of Pt nanoparticle, textural relations suggest the neoformation of PGM adhered to the porous edges of altered pyrite. Cerro Matoso and Planeta Rica should be considered as unconventional PGE deposits, if adequate recovery processes can be applied for their recovery as by-products during Ni (+Co) production.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los elementos del grupo del platino (EGP) están incluidos entre los denominados metales críticos y son esenciales en la industria de productos tecnológicos. Sin embargo, existen muy pocos depósitos de los cuales puedan ser extraídos. Este trabajo investiga tres perfiles de laterita de Ni, tipo silicato hidratado, desarrollados sobre las rocas ultramáficas de Cerro Matoso y Planeta Rica en Colombia. El objetivo principal es determinar la concentración y distribución de EGP, así como identificar las fases portadoras de estos metales. Los mayores contenidos de EGP en Cerro Matoso y Planeta Rica, se concentran en el horizonte limonítico (141-272 ppb) y muestran una fuerte disminución hacia la zona saprolítica y la peridotita serpentinizada (roca parental; &lt;50 ppb). Las concentraciones más altas corresponden a Pt&gt;Ru&gt;Pd y las más bajas a Rh&lt;Os&lt;Ir. Esta distribución indica que los EGP son movilizados en proporciones diferentes durante los procesos de laterización. La alta afinidad entre los EGP y el Fe favorece la formación de aleaciones de EGP-Fe tales como Pt-Ir-Fe-Ni hospedados en oxi-hidróxidos de Fe encontrados en la zona de transición limonita-saprolita en Planeta Rica. Además, se encontraron en la misma zona nanopartículas de Pt (&lt; 1 µm) dentro de pirita framboidal. Ambos tipos de minerales del grupo del platino (MGP) son de origen secundario. En el caso de las aleaciones Pt-Ir-Fe-Ni, esta interpretación está sustentada por su morfología y composición química, comparable con las aleaciones de PGE-Fe-Ni encontradas en las lateritas de República Dominicana. En el caso de las nanopartículas de Pt, las relaciones texturales sugieren la neoformación de MGP adheridos a los bordes porosos de pirita alterada. Con todo esto, Cerro Matoso y Planeta Rica deberían ser considerados como potenciales depósitos no convencionales de EGP, si se aplicasen procesos de refinación adecuados para su recuperación como subproductos durante la producción de Ni (+Co).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Ni-laterite deposit]]></kwd>
<kwd lng="en"><![CDATA[platinum group elements (PGE)]]></kwd>
<kwd lng="en"><![CDATA[platinum group minerals (PGM)]]></kwd>
<kwd lng="en"><![CDATA[Cerro Matoso]]></kwd>
<kwd lng="en"><![CDATA[Planeta Rica]]></kwd>
<kwd lng="en"><![CDATA[Colombia]]></kwd>
<kwd lng="es"><![CDATA[Depósito de laterita de Ni]]></kwd>
<kwd lng="es"><![CDATA[elementos del grupo del platino (EGP)]]></kwd>
<kwd lng="es"><![CDATA[minerales del grupo del platino (MGP)]]></kwd>
<kwd lng="es"><![CDATA[Cerro Matoso]]></kwd>
<kwd lng="es"><![CDATA[Planeta Rica]]></kwd>
<kwd lng="es"><![CDATA[Colombia]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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