<?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>1993-8012</journal-id>
<journal-title><![CDATA[Minería y Geología]]></journal-title>
<abbrev-journal-title><![CDATA[Min. Geol.]]></abbrev-journal-title>
<issn>1993-8012</issn>
<publisher>
<publisher-name><![CDATA[EDUM. Universidad de Moa]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1993-80122019000300270</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Alteraciones relacionadas con la mineralización sulfurosa de los yacimientos Júcaro y Yagruma, occidente de Cuba]]></article-title>
<article-title xml:lang="en"><![CDATA[Alterations related to the sulphurous mineralization of the Júcaro and Yagruma deposits, West of Cuba]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez-Ortiz]]></surname>
<given-names><![CDATA[Iris]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Gámez]]></surname>
<given-names><![CDATA[Esther María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lastra-Rivero]]></surname>
<given-names><![CDATA[José F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velasco-Tapia]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Pinar del Río  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Nuevo León  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<volume>35</volume>
<numero>3</numero>
<fpage>270</fpage>
<lpage>288</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1993-80122019000300270&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1993-80122019000300270&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1993-80122019000300270&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El presente trabajo, a partir del estudio comparativo (textural, mineralógico y geoquímico) de las alteraciones en las rocas relacionadas a los yacimientos Júcaro y Yagruma (formación Encrucijada), ofrece nueva información sobre las asociaciones minerales, particularidades de los procesos hidrotermales en estos depósitos y tipos de alteración. La alteración diagenética se encuentra relacionada con calcita, clorita, pirita, albita, cuarzo y zeolita; tiene carácter regional y se distribuye en toda la formación, manifiesta una tendencia general a valores mayores de Na2O+CaO(adj) e inferiores en FeOt+MgO(adj), con índice de alteración (AI) entre 18 y 40. La hidrotermal se presenta sobre todo en basaltos más relacionados al yacimiento Júcaro (estratoligados) y a los sills sinvolcánicos de diabasas y basaltos del yacimiento Yagruma (zona de conductos); están presentes los valores más bajos de Na2O+CaO(adj) y mayores en FeOt+MgO(adj), con AI entre 26 y 52. El estudio reveló que la alteración hidrotermal es de baja intensidad, con la asociación de minerales típicos descritos para este proceso en los VMS (Volcanic-Massive Sulfide): clorita, calcita, pirita, cuarzo, sericita y epidota. Se corrobora que en ambos depósitos las alteraciones minerales son similares, solo que en Júcaro predomina clorita-calcita-pirita-sericita y en Yagruma clorita-pirita-calcita-sericita-epidota-cuarzo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The present work offers new information on the mineral associations, particularities of hydrothermal processes and types of alteration from a comparative study (mineralogical, textural and geochemical) of alterations in rocks from Júcaro and Yagruma deposits (Encrucijada Formation). The diagenetic alteration is related to chlorite, pyrite, calcite, albite, quartz and zeolite, has a regional character and is distributed throughout the Formation, showing a general trend to higher values of Na2O + CaO (adj) and lower in FeOt + MgO (adj), with alteration index (AI) between 18 and 40. The hydrothermal alteration occurs mainly in basalts more related to the Júcaro deposit (stratabound) and to the volcanic sills of diabase and basalts of the Yagruma deposit (conduit zone); the lowest values &#8203;&#8203;of Na2O + CaO (adj) and higher are present in FeOt + MgO (adj), with AI between 26 and 52. The study revealed that the hydrothermal alteration is of low intensity with the association of typical minerals described for this process in the VMS (Volcanic-Massive Sulfide): chlorite, calcite, pyrite, quartz, sericite and epidote. It is corroborated that the mineral alterations are similar in both deposits, just in Júcaro chlorite-calcite-pyrite-sericite predominates and chlorite-pyrite-calcite-sericite-epidote-quartz in Yagruma.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[alteración diagenética]]></kwd>
<kwd lng="es"><![CDATA[alteración hidrotermal]]></kwd>
<kwd lng="es"><![CDATA[sulfuros masivos volcánogenicos]]></kwd>
<kwd lng="es"><![CDATA[índices de alteración]]></kwd>
<kwd lng="es"><![CDATA[formación Encrucijada]]></kwd>
<kwd lng="es"><![CDATA[Bahía Honda]]></kwd>
<kwd lng="en"><![CDATA[diagenetic alteration]]></kwd>
<kwd lng="en"><![CDATA[hydrothermal alteration]]></kwd>
<kwd lng="en"><![CDATA[Massive volcanogenic sulphides]]></kwd>
<kwd lng="en"><![CDATA[alteration rates]]></kwd>
<kwd lng="en"><![CDATA[stratabound formation]]></kwd>
<kwd lng="en"><![CDATA[Honda Bay]]></kwd>
</kwd-group>
</article-meta>
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