<?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>0016-7169</journal-id>
<journal-title><![CDATA[Geofísica internacional]]></journal-title>
<abbrev-journal-title><![CDATA[Geofís. Intl]]></abbrev-journal-title>
<issn>0016-7169</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geofísica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-71692016000200107</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Geophysical modeling of the manganese deposit for Induced Polarization method in Itapira (Brazil)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vieira]]></surname>
<given-names><![CDATA[Leandro B.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreira]]></surname>
<given-names><![CDATA[César A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Côrtes]]></surname>
<given-names><![CDATA[Ariane R. P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Luvizotto]]></surname>
<given-names><![CDATA[George L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade Estadual Paulista Instituto de Geociências e Ciências Exatas Programa de Pós-graduação em Geociências]]></institution>
<addr-line><![CDATA[Rio Claro SP]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidade Estadual Paulista Instituto de Geociências e Ciências Exatas Departamento de Geologia Aplicada]]></institution>
<addr-line><![CDATA[Rio Claro SP]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidade Estadual Paulista Júlio de Mesquita Filho Instituto de Geociências e Ciências Exatas Departamento de Petrologia e Metalogenia]]></institution>
<addr-line><![CDATA[Rio Claro SP]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<volume>55</volume>
<numero>2</numero>
<fpage>107</fpage>
<lpage>117</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692016000200107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692016000200107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692016000200107&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This paper presents the results of the investigation of a supergene manganese occurrence in the southeast of Brazil, using the Induced Polarization geophysical method. This study aims to characterize the surface and subsurface morphology of one of these occurrences, named São Roque, based on the contrast of the electrical properties of the ore and the host rocks. The ore, which is composed mainly of manganese oxides and hydroxides and subordinated graphite, occurs in the form of small discontinuous lenses hosted by quartzites and schists of the Itapira Group. The geophysical survey consisted on 10 lines of Induced Polarization Tomography using a Wenner-Schlumberger array, with an alongline electrode separation of 10 m for all lines. The IP data were modeled through commercial inversion software to generate 2D section models of chargeability. In order to create a 3D visualization model of chargeability, the 2D inversion models were then combined and interpolated in order to create a 3D visualization model. The 3D model revealed two independent ore bodies in both surface and subsurface, characterized for high chargeability (up to 20mV/V), instead of a single elongated orebody as suggested by the lateritic surface in the field. In addition, the model showed that the orebodies are elongated perpendicular to the area main structural trend and the regional alignment of the lateritic occurrences, which can bring new ideas in terms of local exploration strategies for manganese in this context.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Este artículo presenta la aplicación de los resultados del método geofísico de Polarización Inducida (IP) en el estudio de la ocurrencia de manganeso supergénicos en el sudeste de Brasil, con análisis de la arquitectura del depósito en subsuelo, basado en el contraste de las propiedades físicas de los minerales de mena (óxidos hidróxidos de manganeso y grafito) y la roca alrededor. El contexto geológico regional se define por la ocurrencia de tipos de roca que pertenecen al Complejo Amparo y Grupo Itapira. Este Grupo acoge la mineralización en una sucesión de cuarcitas, esquistos y gneises con porciones subordinadas. El estudio geofísico consistió en 10 líneas paralelas de calicatas eléctricas en dispositivo Wenner-Schlumberger, con una separación entre los electrodos de 10m y 50m entre líneas. Los datos de campo permitieron la generación de modelos de inversión 2D posteriormente combinan y interpolados para generar modelos de visualización 3D, de la que eran cuerpos de mineral probables delimitados en profundidad y la comparación de las dimensiones de la formación laterítica reconocidos en el campo. Se reconocieron dos cuerpos independientes de mineral en profundidad, que se caracterizan por valores de alta cargabilidad (por encima de 20mV/V) atribuida a la presencia de grafito en cantidades de hasta 5 %. Los cuerpos de mineral en profundidad mostraron área de cobertura mucho menor para la formación laterítica. Visualización 3D habilitado una estimación de la morfología de los cuerpos, sentido del buceo y la identificación de orientación transversal a la estructuración regional de plegado.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[calicatas eléctricas]]></kwd>
<kwd lng="es"><![CDATA[manganeso supergénico]]></kwd>
<kwd lng="es"><![CDATA[grafito]]></kwd>
<kwd lng="es"><![CDATA[cargabilidad]]></kwd>
<kwd lng="es"><![CDATA[modelamiento 3D]]></kwd>
<kwd lng="en"><![CDATA[electrical tomographic]]></kwd>
<kwd lng="en"><![CDATA[lateritic manganese]]></kwd>
<kwd lng="en"><![CDATA[graphite]]></kwd>
<kwd lng="en"><![CDATA[chargeability]]></kwd>
<kwd lng="en"><![CDATA[3D modeling]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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