<?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>0120-0283</journal-id>
<journal-title><![CDATA[Boletín de Geología]]></journal-title>
<abbrev-journal-title><![CDATA[bol.geol.]]></abbrev-journal-title>
<issn>0120-0283</issn>
<publisher>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-02832018000300029</article-id>
<article-id pub-id-type="doi">10.18273/revbol.v40n3-2018002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estratigrafía del cráter y morfología del volcán Cerro Machín, Colombia]]></article-title>
<article-title xml:lang="en"><![CDATA[Stratigraphy of the crater and morphology of Cerro Machín volcano, Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Piedrahita]]></surname>
<given-names><![CDATA[Daniel Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar-Casallas]]></surname>
<given-names><![CDATA[Camila]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arango-Palacio]]></surname>
<given-names><![CDATA[Eliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Murcia]]></surname>
<given-names><![CDATA[Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Arango]]></surname>
<given-names><![CDATA[Johana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Caldas  ]]></institution>
<addr-line><![CDATA[Manizales ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Caldas Instituto de Investigaciones en Estratigrafía ]]></institution>
<addr-line><![CDATA[Manizales ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Caldas Programa de Geología ]]></institution>
<addr-line><![CDATA[Manizales ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Salta  ]]></institution>
<addr-line><![CDATA[Salta ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de Caldas Departamento de Ciencias Geológicas ]]></institution>
<addr-line><![CDATA[Manizales ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[Morelia ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>40</volume>
<numero>3</numero>
<fpage>29</fpage>
<lpage>48</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-02832018000300029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-02832018000300029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-02832018000300029&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El Volcán Cerro Machín (VCM) se localiza en el flanco oriental de la Cordillera Central de Colombia a 17 km al occidente de la ciudad de Ibagué (Tolima). El VCM es un volcán Holocénico de composición dacítica, con evidencia de grandes erupciones (VEI 5). Estratigráficamente, en las paredes internas del cráter es posible observar una secuencia de depósitos de Corrientes de Densidad Piroclástica (CDPs) diluida con características de depósitos de oleadas basales. La presencia de líticos accidentales evidencia que durante la fragmentación fue involucrado el basamento. De esta manera es posible sugerir que la interacción agua/magma jugó un papel importante en la dinámica del último evento eruptivo, el cual constituye los depósitos que conforman el cráter. Análisis morfológicos evidencian un cráter de 2,4 km de diámetro con una abertura hacia el sector suroccidental, el cual alberga un domo de 490 m de altura que posiblemente durante su emplazamiento fue el causante de la destrucción del cráter. Aunque el VCM es sin duda un volcán poligenético (seis erupciones en los últimos 5000 años), las características sedimentológicas de los depósitos del cráter así como su morfología, sugieren una estructura monogenética de cono de toba. En conclusión, el VCM debe ser definido como un "volcán compuesto con morfología de cono de toba".]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Cerro Machín Volcano (CMV) is located on the eastern flank of the Central Cordillera of Colombia, 17 km west of the city of Ibagué (Tolima). The CMV, a dacitic Holocene volcano, has evidence of multiple considerable eruptions (VEI 5). The inner walls of the crater display a sequence of dilute pyroclastic density currents (PDC) deposits, which contain characteristics of basal surge deposits. The presence of accidental lithics indicates that the basement of the volcano was involved in the magmatic fragmentation process. It is, thus possible to suggest that water-magma interaction played an important role in the dynamics of the last eruptive event, which formed the deposits that molded the crater. On the other hand, a morphological analysis revealed that the crater is 2.4 km in diameter, has an opening which faces the southwestern sector, and carries a dome of 490 m in height. Thus, it is interpreted that the growing dome destroyed the crater during its emplacement. Although the CMV is undoubtedly a polygenetic volcano (six eruptions in the last 5000 years), the sedimentological and morphological characteristics of the crater deposits suggest a monogenetic tuff cone structure. In conclusion, the CMV should be defined as a "composite volcano with tuff cone morphology".]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Corrientes de Densidad Piroclástica (CDPs)]]></kwd>
<kwd lng="es"><![CDATA[oleadas piroclásticas]]></kwd>
<kwd lng="es"><![CDATA[geomorfología volcánica]]></kwd>
<kwd lng="es"><![CDATA[volcán poligenético]]></kwd>
<kwd lng="es"><![CDATA[cono de toba]]></kwd>
<kwd lng="en"><![CDATA[Pyroclastic density currents]]></kwd>
<kwd lng="en"><![CDATA[pyroclastic surges]]></kwd>
<kwd lng="en"><![CDATA[volcanic geomorphology]]></kwd>
<kwd lng="en"><![CDATA[polygenetic volcano]]></kwd>
<kwd lng="en"><![CDATA[tuff cone]]></kwd>
</kwd-group>
</article-meta>
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