<?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>S1405-33222024000300004</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2024v76n3a140224</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Sobre la confiabilidad de algunos registros paleomagnéticos transicionales en la Faja Volcánica Transmexicana]]></article-title>
<article-title xml:lang="en"><![CDATA[On the reliability of some transitional paleomagnetic records along the Transmexican Volcanic Belt]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cervantes-Solano]]></surname>
<given-names><![CDATA[Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Ortega]]></surname>
<given-names><![CDATA[Ulises]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Ruiz]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Goguitchaichvili]]></surname>
<given-names><![CDATA[Avto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Loera]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosas-Elguera]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Urrutia-Fucugauchi]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maciel-Peña]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Escuela Nacional de Estudios Superiores Unidad Morelia ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Posgrado en Ciencias de la Tierra ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica Unidad Michoacán Laboratorio Interinstitucional de Magnetismo Natural]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Potosino de Investigación Científica y Tecnológica A.C. División de Geociencias Aplicadas ]]></institution>
<addr-line><![CDATA[San Luis Potosí ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de los Valles ]]></institution>
<addr-line><![CDATA[Caimanero Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica Laboratorio de Paleomagnetismo]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Instituto Tecnológico Superior de Tacámbaro  ]]></institution>
<addr-line><![CDATA[Tacámbaro Michoacán]]></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=S1405-33222024000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222024000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222024000300004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El campo magnético terrestre experimenta variaciones tanto en su configuración primordialmente dipolar como en su intensidad. Los registros paleomagnéticos han demostrado que estas variaciones pueden ser tan extremas que el campo ha llegado a invertir su polaridad en múltiples ocasiones en el pasado geológico. Del mismo modo se han observado varios casos en donde el campo geomagnético se aleja de su posición dipolar más estable durante períodos relativamente cortos dirigiéndose hacia la dirección opuesta sin llegar a la inversión geomagnética total. En este contexto, estudios paleomagnéticos realizados recientemente en la Faja Volcánica Transmexicana han arrojado nuevas evidencias sobre posibles excursiones geomagnéticas ocurridas durante el último millón de años. Sin embargo, algunos de estos resultados son controversiales, ya que sitios con aparentemente la misma edad asociada, han arrojado direcciones paleomagnéticas contradictorias. Estas diferencias se han atribuido tanto a la precisión en la determinación de la edad como a aspectos metodológicos durante el muestreo, lo que dificulta su interpretación desde el punto de vista geomagnético. Aquí reportamos, un estudio detallado de magnetismo de roca, aeromagnético y paleomagnético en nueve unidades de enfriamiento independientes pertenecientes al Campo Volcánico Michoacán Guanajuato (Faja Volcánica Transmexicana) donde se han reportado previamente resultados con este tipo de contradicciones.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Earth's magnetic field experiences variations in both its essentially dipolar configuration and absolute intensity. Paleomagnetic records have shown that these variations can be so extreme that the field has reversed its polarity on multiple occasions in the geological past. Moreover, the geomagnetic field occasionally moves away from its most stable dipole position for relatively short periods, heading in the opposite direction without reaching total geomagnetic reversal. In this context, paleomagnetic studies carried out recently in the Trans Mexican Volcanic Belt have provided some new evidence about several potential geomagnetic excursions that occurred during the last million years. However, some of these results are controversial since sites with the same associated age yielded contradictory paleomagnetic directions. These differences have been attributed both to the precision in age determination and to methodological aspects during sampling, which makes their interpretation difficult from a geomagnetic point of view. Here we report, a detailed rock-magnetic, aeromagnetic and paleomagnetic study on nine independent cooling units belonging to the Michoacan Guanajuato Volcanic Field (Trans-Mexican Volcanic Belt) where these lava units have provided some contradictory results reported in previous studies.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[paleomagnetismo]]></kwd>
<kwd lng="es"><![CDATA[excursión geomagnética]]></kwd>
<kwd lng="es"><![CDATA[campo volcánico Michoacán-Guanajuato]]></kwd>
<kwd lng="en"><![CDATA[paleomagnetism]]></kwd>
<kwd lng="en"><![CDATA[geomagnetic excursion]]></kwd>
<kwd lng="en"><![CDATA[Michoacán-Guanajuato volcanic field]]></kwd>
</kwd-group>
</article-meta>
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