<?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>0256-7024</journal-id>
<journal-title><![CDATA[Revista Geológica de América Central]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Geol. Amér. Central]]></abbrev-journal-title>
<issn>0256-7024</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0256-70242017000100083</article-id>
<article-id pub-id-type="doi">10.15517/rgac.v0i56.29238</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Geología del Cuadrante Tapantí (1:50 000), Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Geology of Tapantí Quadrangle (1:50 000), Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sojo]]></surname>
<given-names><![CDATA[Dennis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Denyer]]></surname>
<given-names><![CDATA[Percy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gazel]]></surname>
<given-names><![CDATA[Esteban]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado]]></surname>
<given-names><![CDATA[Guillermo E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Zaragoza  ]]></institution>
<addr-line><![CDATA[Zaragoza ]]></addr-line>
<country>ES</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Geotest S.A  ]]></institution>
<addr-line><![CDATA[San Pedro San José]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,UCR Centro de Investigación en Ciencias Geológicas ]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Virginia Tech Department of Geosciencies ]]></institution>
<addr-line><![CDATA[Virginia ]]></addr-line>
<country>US</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto Costarricense de Electricidad (ICE)  ]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>CR</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<numero>56</numero>
<fpage>83</fpage>
<lpage>116</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0256-70242017000100083&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0256-70242017000100083&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0256-70242017000100083&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenSe presenta un mapa geológico, escala 1:50 000 del cuadrante Tapantí, el cual se encuentra en la región central de Costa Rica y forma parte del Cinturón Deformado del Centro de Costa Rica (CDCCR), producto de la interacción de la cordillera de Coco y la región W de la microplaca Panamá. Las rocas más antiguas cartografiadas son miocenas y están representadas por las formaciones sedimentarias Pacacua, Peña Negra, San Miguel y Coris, que forman el borde oriental de la cuenca Candelaria. Se distinguieron 3 eventos magmáticos; el arco volcánico Mioceno, representando por la Formación La Cruz y clastos volcánicos de la Formación Pacacua; un nuevo periodo de actividad ígnea entre 6 Ma y 4,2 Ma, representado por las formaciones Grifo Alto, Doán y el Intrusivo de Tapantí y, finalmente, se desarrolla el arco volcánico actual, representado por las formaciones Paraíso y Cervantes, con un rango de edad entre los 0,6 Ma y 0,02 Ma. Desde el punto de vista geoquímico, se observa un fuerte cambio entre los 10 y 6 Ma, lo cual se expresa por medio del enriquecimiento de K y Si, y los cambios en la concentración de U, Sr, Ba, La. Dicho cambio corresponde temporalmente con el arribo de la cordillera de Coco a la Fosa Mesoamericana y es reflejado en la región por medio del arco magmático del Plioceno y el arco volcánico actual. El modelo estructural sugiere la existencia de 2 episodios de deformación, el primero ocurrió durante el periodo comprendido entre el Mioceno Superior y el Plioceno y produjo la Zona de Plegamiento Orosi-Patarrá mientras que el segundo corresponde con la instauración del CDCCR, desde el Plioceno hasta la actualidad, conformado por fallas sinestrales con orientación ENE y dextrales con orientación NW.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractWe present a geologic map of the Tapantí quadrangle, which is located in the central region of Costa Rica and belongs to the Central Costa Rica Deformed Belt (CCRDB). The CCRDB is a consequence of the interaction of the Cocos Ridge and the Western edge of the Panama microplate. The oldest rocks mapped in this work are Miocene in age and theyvbelongs to Pacacua, Peña Negra and Coris formations, than form the western edge of the Candelaria basin. Three igneous events were distinguished. First, the Miocene volcanic arc, which is represented by the rocks of La Cruz Formation and the clasts of Pacacua Formation. Another period of igneous activity was recorded in Grifo Alto and Doán formations and the Tapantí Intrusive, with an age range of 0.6-0.03 Ma. From a geochemical point of view is remarkable a change between 10 to 6 Ma, enrichment of K and Si and changes in U, Sr, Ba and La concentrations. This change corresponds with the Cocos Ridge arriving to the Middle America Trench and it is visible because the Pliocene magmatic arc, the Pliocene intrusive of Tapantí and the nowadays volcanic arc. The structural model suggests the existence of two deformation events, the first occurred during the period of time between Late Miocene and Pliocene and it formed the Folding Zone Orosi-Patarrá, and the second one corresponds to the establishment of CCRDB, from Pliocene to present, which is constituted by left lateral faults bearing ENE and right lateral faults bearing NW.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Mapa geológico]]></kwd>
<kwd lng="es"><![CDATA[Talamanca]]></kwd>
<kwd lng="es"><![CDATA[cuenca Candelaria]]></kwd>
<kwd lng="es"><![CDATA[arco volcánico]]></kwd>
<kwd lng="es"><![CDATA[Irazú]]></kwd>
<kwd lng="en"><![CDATA[Geologic map]]></kwd>
<kwd lng="en"><![CDATA[Talamanca]]></kwd>
<kwd lng="en"><![CDATA[Candelaria basin]]></kwd>
<kwd lng="en"><![CDATA[volcanic arc]]></kwd>
<kwd lng="en"><![CDATA[Irazú]]></kwd>
</kwd-group>
</article-meta>
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