<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442021000600036</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v69is2.48306</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Naturaleza y estructura geológica del borde costero del noroeste de Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Geological background and structure of the northwestern coastline of Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solano]]></surname>
<given-names><![CDATA[Juan-Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[Ana-Teresita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Madrigal]]></surname>
<given-names><![CDATA[María-del-Pilar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[Wendy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[Carlos-Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chavarría]]></surname>
<given-names><![CDATA[María-Marta]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Denyer]]></surname>
<given-names><![CDATA[Percy]]></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 Costa Rica Centro de Investigación en Ciencias Geológicas ]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí  ]]></institution>
<addr-line><![CDATA[ San Luis Potosí]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica Escuela Centroamericana de Geología ]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Erwatec Ingenieurgesellschaft GmbH  ]]></institution>
<addr-line><![CDATA[ Kiel]]></addr-line>
<country>Alemania</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Barrick Gold Corporation  ]]></institution>
<addr-line><![CDATA[Toronto Ontario]]></addr-line>
<country>Canadá</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Área de Conservación Guanacaste  ]]></institution>
<addr-line><![CDATA[ Guanacaste]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2021</year>
</pub-date>
<volume>69</volume>
<fpage>36</fpage>
<lpage>59</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442021000600036&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442021000600036&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442021000600036&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  El noroeste de Costa Rica representa un área con una alta riqueza geológica que evidencia rocas generadas en diferentes ambientes, como plano abisal, talud continental, plataforma continental, volcánicos continentales efusivos y explosivos, volcánicos submarinos, costeros, erosivos fluviales, erosivos gravitatorios, de intrusión y el manto terrestre.  Objetivo:  Describir el contexto geológico actual del noroeste de Costa Rica, mediante el análisis y recopilación de datos de campo, geoquímicos, petrológicos, estructurales, paleontológicos y radiométricos con el fin de reconstruir los eventos y etapas de deformación desde el Jurásico a la actualidad.  Métodos:  Se hizo una recopilación bibliográfica de estudios en diversas ramas geológicas para establecer un estado del arte del extremo noroeste de Costa Rica.  Resultados:  La historia geológica representa el registro en rocas desde el Jurásico al Holoceno - actualidad con once etapas definidas a partir de interpretaciones petrológicas, estructurales, geocronológicas, estratigráficas y paleontológicas agrupadas en tres etapas de depositación y afectadas por cuatro fases tectónicas compresivas.  Conclusiones:  Las etapas de depositación corresponden con una primera etapa magmática con afinidad oceánica entre el Jurásico y el Cretácico Superior, una segunda etapa predominantemente sedimentaria con un rango de edad entre el Cretácico Superior y el Oligoceno, y por último una etapa volcánica efusiva - explosiva ubicada desde el Plioceno hasta la actualidad. Las fases tectónicas se asocian con diferentes eventos entre placas. La primera se dio en el Cretácico Inferior y su principal resultado visible fue la emersión de la Ofiolita de Santa Elena; la segunda sucedió del Cretácico Superior temprano al Campaniano y su reconocimiento está ligado a la posición actual de la Ofiolita de Santa Elena y sus estructuras circundantes; la tercera fase aconteció desde el Eoceno Superior hasta el Mioceno y su principal producto fue la generación del tren de pliegues sedimentarios del Golfo de Santa Elena a bahía de Salinas; y por último se presenta una fase Cuaternaria que originó el eje de basculamiento de los productos piroclásticos frente a la cordillera volcánica de Guanacaste.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  The Costa Rican northwestern coastline has a wide geological uniqueness that exhibits rocks from different environments such as abyssal plane, continental slope, continental platform, volcanic eruptions (effusive, explosive, and submarine), coastal, erosional (fluvial and gravitatory), intrusions, and upper mantle rocks.  Objective:  To present the geologic state of the art of the northwestern coastline of Costa Rica through the bibliographic review of geochemical, petrologic, structural, paleontological and geochronological data.  Methods:  A bibliographic revision was done to propose a state of the art of northwestern coastline of Costa Rica.  Results:  The geologic record shows eleven stages from the Jurassic to the Holocene. These stages were regrouped from petrologic, structural, geochronologic, stratigraphic and paleontological interpretations in three depositional stages and four compressive tectonic phases.  Conclusions:  The first depositional stage is volcanic with oceanic affinity between the Jurassic and Upper Cretaceous. The second has a sedimentary predominance with an age range between the Upper Cretaceous and the Miocene. The last depositional stage is a volcanic (effusive and explosive) from the Pliocene until the present. The tectonic phases are associate with different interactions between tectonic plates. The first phase triggered the Santa Elena Ophiolite obduction during the Early Cretaceous. The second phase occurred in the Early Upper Cretaceous - Campanian and is recognized by its current position and surrounding structures. The third phase lasted from the Upper Eocene until the Miocene and its main result was the folding of the Bahía de Salinas sedimentary rocks. Finally, the Quaternary phase created a tilt axis and the aperture for the deposition of pyroclastic density currents in front of the Guanacaste volcanic ridge.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Santa Elena ophiolite]]></kwd>
<kwd lng="en"><![CDATA[geologic history]]></kwd>
<kwd lng="en"><![CDATA[stress]]></kwd>
<kwd lng="en"><![CDATA[volcanic eruption]]></kwd>
<kwd lng="en"><![CDATA[Guanacaste]]></kwd>
<kwd lng="en"><![CDATA[tectonic phase]]></kwd>
<kwd lng="en"><![CDATA[sedimentary rock]]></kwd>
<kwd lng="es"><![CDATA[Ofiolita de Santa Elena]]></kwd>
<kwd lng="es"><![CDATA[historia geológica]]></kwd>
<kwd lng="es"><![CDATA[compresión]]></kwd>
<kwd lng="es"><![CDATA[erupción volcánica]]></kwd>
<kwd lng="es"><![CDATA[Guanacaste]]></kwd>
<kwd lng="es"><![CDATA[fase tectónica]]></kwd>
<kwd lng="es"><![CDATA[roca sedimentaria.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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