<?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>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742023000200127</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2023.2.1721</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Geocronología U-Pb y geoquímica del vulcanismo de arco del Paleoceno de la Formación Tetelcingo en el área de Chilpancingo-Tixtla, Guerrero (sur de México)]]></article-title>
<article-title xml:lang="en"><![CDATA[U-Pb geochronology, and geochemistry of the Paleocene arc vulcanism of the Tetelcingo Formation, Chilpancingo-Tixtla area, Guerrero (south of Mexico)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sarmiento-Villagrana]]></surname>
<given-names><![CDATA[Alicia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortíz-Degante]]></surname>
<given-names><![CDATA[Sandra Magaly]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Talavera-Mendoza]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ocampo-Díaz]]></surname>
<given-names><![CDATA[Yam Zul Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Guerrero Facultad de Ciencias Agropecuarias y Ambientales ]]></institution>
<addr-line><![CDATA[ Guerrero]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Guerrero Escuela Superior de Ciencias de la Tierra ]]></institution>
<addr-line><![CDATA[ Guerrero]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Facultad de Ingeniería ]]></institution>
<addr-line><![CDATA[ San Luis Potosí]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>40</volume>
<numero>2</numero>
<fpage>127</fpage>
<lpage>141</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742023000200127&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742023000200127&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742023000200127&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los depósitos continentales del Paleógeno (Grupo Balsas) del sur de México han sido poco estudiados y se desconoce en gran medida su origen, edad, naturaleza y ambiente tectónico de formación; elementos cruciales para comprender la relación del sur de México con Centroamérica y América del Sur. En este sentido, se realizó un estudio en el que se reportan por primera vez datos de estratigrafía, geoquímica y geocronología U-Pb de las rocas volcánicas de la Formación Tetelcingo del área de Chilpancingo-Tixtla, Guerrero. La Formación Tetelcingo es una secuencia volcano-sedimentaria cuyas rocas están depositadas discordantemente sobre rocas cretácicas (formaciones Morelos y Mezcala). La geoquímica de las rocas volcánicas indica una variación composicional de andesita a dacita. Todas las muestras presentan enriquecimiento en elementos litófilos de radio iónico grande (LILE) y en tierras raras ligeras (LREE), con respecto a los elementos de alto potencial iónico (HFSE) y tierras raras pesadas (HREE). Además, exhiben anomalías negativas en Nb, Ta, P y Ti; positivas en Ba, Sr y K; y escasas a inexistentes anomalías en Eu (0.69-1.04), así como concentraciones altas de Sr y bajas en Yb, Y, Ni y Cr. El emplazamiento de las rocas volcánicas estudiadas ocurrió durante dos ciclos de vulcanismo sucesivos; el primer ciclo inició entre 65.21 ± 0.97 Ma (zircón) y 66.7 ± 2.9 Ma (esfena), mientras que el segundo entre 65.27 ± 1.9 Ma (zircón) y 64.9 ± 4.4 Ma (esfena) U-Pb. Las rocas volcánicas de la Formación Tetelcingo muestran características geoquímicas similares a las adakitas formadas en un ambiente de arco continental. El emplazamiento de las rocas volcánicas ocurrió en el límite Cretácico-Paleógeno, en un contexto geodinámico con subdución activa y subsecuente transtensión y exhumación relacionada al desprendimiento y migración del bloque Chortís hacia el sureste.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Paleogene continental deposits (Balsas Group) of southern Mexico have been scarcely studied and its origin, age, nature, and tectonic setting of formation is largely unknown; these elements are crucial to understand the relationship between southern Mexico, and Central and Southern America. In this way, we report in this study for the first time data of the stratigraphy, geochemistry, and U-Pb geochronology of the volcanics rocks of the Tetelcingo Formation in the Chilpancingo-Tixtla area, Guerrero, was carried out. The Tetelcingo Formation is a volcano-sedimentary sequence unconformably emplaced on Cretaceous rocks (Morelos and Mezcala formations). The geochemistry of volcanic rocks indicate a compositional variation from andesite to dacite. All samples show enrichment in large ion lithophile elements (LILE) and light REES (LREEs) relative to high field strength elements (HFSE) and heavy REES (HREEs). In addition, they show negative anomalies in Nb, Ta, P and Ti; positive in Ba, Sr and K; and scarce to nonexistent anomalies in Eu (0.69-1.04), as well as, high Sr and low Yb, Y, Ni and Cr concentrations. The emplacement of the studied volcanic rocks occurred during two successive volcanic cycles; the first cycle started between 65.21 ± 0.97 Ma (zircon) and 66.7 ± 2.9 Ma (sphene), while the second between 65.27 ± 1.9 Ma (zircon) and 64.9 ± 4.4 Ma (sphene) U-Pb. The volcanic rocks of the Tetelcingo Formation have similar geochemical characteristics to adakitic rocks formed in a continental arc settings. The deposition of the volcanic rocks occurred at the Cretaceous-Paleogene boundary, in a geodynamical context of active subduction, and subsequent transtension and exhumation related to detachment and migration of the chortis block towards southeast.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Geocronología U-Pb]]></kwd>
<kwd lng="es"><![CDATA[Geoquímica]]></kwd>
<kwd lng="es"><![CDATA[Formación Tetelcingo]]></kwd>
<kwd lng="es"><![CDATA[Magmatismo de arco]]></kwd>
<kwd lng="es"><![CDATA[Grupo Balsas]]></kwd>
<kwd lng="es"><![CDATA[sur de México]]></kwd>
<kwd lng="en"><![CDATA[U-Pb geochronology]]></kwd>
<kwd lng="en"><![CDATA[Geochemistry]]></kwd>
<kwd lng="en"><![CDATA[Tetelcingo Formation]]></kwd>
<kwd lng="en"><![CDATA[Arc magmatism]]></kwd>
<kwd lng="en"><![CDATA[Balsas Group]]></kwd>
<kwd lng="en"><![CDATA[South of Mexico]]></kwd>
</kwd-group>
</article-meta>
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