<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222024000300006</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2024v76n3a130224</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Paleomagnetic study of the Chicxulub impact breccia sequence in the Santa Elena borehole - evidence of reverse polarity remanent magnetizations]]></article-title>
<article-title xml:lang="es"><![CDATA[Estudio paleomagnético de la secuencia de brechas de impacto de Chicxulub en el pozo Santa Elena - evidencia de magnetizaciones de polaridad reversa remanentes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velasco-Villarreal]]></surname>
<given-names><![CDATA[Miriam]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Cruz]]></surname>
<given-names><![CDATA[Ligia]]></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[Urrutia-Fucugauchi]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto de Investigación Científica y Estudios Avanzados Chicxulub  ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Coordinación de la Investigación Científica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>76</volume>
<numero>3</numero>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222024000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222024000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222024000300006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Results of a paleomagnetic study of the Chicxulub breccias in the Santa Elena borehole are presented. The impact produced a deep excavation in the Yucatan platform, with fragmentation and deformation of the target lithologies. Fragmented material was ejected at high velocities and high temperatures, forming a central plume and lateral curtains. In the target zone, crustal rocks were melted forming a melt pool with breccias emplaced in the crater and proximal areas. Here we analyze the impact ejecta in a proximal location, south of the crater rim at 110 km away from the crater center at Chicxulub Puerto. The breccias in the Santa Elena borehole cored between 332 and 504 m depth are formed by melt, basement and carbonate clasts within carbonate-rich and melt-basement-rich matrix. The magnetic susceptibility, remanent magnetization and coercivity and unblocking temperature spectra provide constraints on the breccia emplacement. Thermal and alternating field demagnetization shows univectorial and two-component magnetizations with upward inclinations and only three samples with downward inclinations. Paleomagnetic studies of the impact breccias have shown mixed normal and reverse polarities, which have been interpreted in terms of reverse polarity characteristic magnetizations and hydrothermally induced overprints that vary with relative location. The upward paleomagnetic inclinations in the Santa Elena breccia section are consistent with reverse polarity magnetizations acquired during the ch29r chron.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se presentan los resultados del estudio paleomagnético de las brechas de impacto en el pozo Santa Elena. El impacto produjo una excavación profunda en la plataforma de Yucatán, con fragmentación y deformación. El material fragmentado fue expulsado a altas velocidadesy altas temperaturas, formando una pluma central y cortinas laterales. En la zona de impacto, las rocas de la corteza se fragmentaron y fundieron, con brechas emplazadas en el cráter y las áreas próximas. En este estudio, analizamos la secuencia de brechas de impacto en el pozo Santa Elena, ubicado a ~110 km del centro del cráter en Chicxulub Puerta La secuencia de breclas está entre 332y 504 m de profundidad, formada por clastos de fusión, basamento y carbonatas dentro de una matriz rica en carbonatos o en basamento y roca fundida. Se analizan datos de susceptibilidad magnética, magnetización remanente y los espectros de temperatura y de coercitividad. La desmagnetización térmica y de campos alternos muestra magnetizaciones univectoriales y de dos componentes, con inclinaciones arriba de la horizontal, con tres muestras con inclinaciones debajo de la horizontal. Estudios paleomagnéticos en las brechas de impacto han mostrado polaridades normales e inversas mixtas, que se han interpretado en términos de magnetizaciones de polaridad reversa y magnetizaciones secundarias, generadas por alteración hidrotermal. Los efectos de alteración hidrotermal varían con la distancia respecto a la zona central del cráter. Las inclinaciones paleomagnéticas negativas en la sección de la brecha de Santa Elena se interpretan como magnetizaciones de polaridad reversa, consistente con el cron ch29r de polaridad reversa.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Chicxulub crater]]></kwd>
<kwd lng="en"><![CDATA[impact breccias]]></kwd>
<kwd lng="en"><![CDATA[paleomagnetism]]></kwd>
<kwd lng="en"><![CDATA[magnetic polarity]]></kwd>
<kwd lng="en"><![CDATA[emplacement mode]]></kwd>
<kwd lng="en"><![CDATA[hydrothermal system]]></kwd>
<kwd lng="es"><![CDATA[Cráter Chicxulub]]></kwd>
<kwd lng="es"><![CDATA[brechas de impacto]]></kwd>
<kwd lng="es"><![CDATA[paleomagnetismo]]></kwd>
<kwd lng="es"><![CDATA[polaridad magnética]]></kwd>
<kwd lng="es"><![CDATA[modo de emplazamiento]]></kwd>
<kwd lng="es"><![CDATA[sistema hidrotermal]]></kwd>
</kwd-group>
</article-meta>
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