<?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>S0120-02832024000200013</article-id>
<article-id pub-id-type="doi">10.18273/revbol.v46n2-2024001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estimación del factor de aplanamiento de la inclinación magnética y sus implicaciones en los modelos tectónicos del Jurásico en la margen NW de Suramérica]]></article-title>
<article-title xml:lang="en"><![CDATA[Flattening factor estimation of the magnetic inclination and its implications in the Jurassic tectonic models in the NW margin of South America]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Chavairo]]></surname>
<given-names><![CDATA[Santiago]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez]]></surname>
<given-names><![CDATA[Giovanny]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Goyes-Peñafiel]]></surname>
<given-names><![CDATA[Paul]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Industrial de Santander  ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Industrial de Santander  ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2024</year>
</pub-date>
<volume>46</volume>
<numero>2</numero>
<fpage>13</fpage>
<lpage>30</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-02832024000200013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-02832024000200013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-02832024000200013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las reconstrucciones paleogeográficas y los modelos tectónicos se complementan con el paleomagnetismo, ya que las rotaciones son calculadas con base en la declinación magnética y las paleolatitudes se derivan de la inclinación magnética. Los procesos de enterramiento y compactación en rocas siliciclásticas pueden causar aplanamiento de la inclinación y por tanto una subestimación de la paleolatitud. Aunque diferentes técnicas se han propuesto para calcular el factor del aplanamiento, estas requieren conjuntos de datos significativamente altos y procesos de laboratorio tediosos o sofisticados. Este trabajo propone calcular el factor de aplanamiento de la inclinación magnética mediante la combinación de técnicas rutinarias como la Anisotropía de la Susceptibilidad Magnética (ASM) y el paleomagnetismo. Se reportan resultados de ASM en 63 muestras del Grupo Girón, como complemento para el cálculo de la corrección de la inclinación magnética para un total de 103 sitios en rocas del Triásico al Cenozoico distribuidos en la Cordillera Oriental, Macizo de Santander y Catatumbo. Se aplicaron 4 filtros a los datos disponibles y se elaboraron 4 modelos curve fit. El valor medio del factor de aplanamiento calculado muestra un factor de 1,04 ± 0,6, sugiriendo que la inclinación magnética no ha sido afectada por aplanamiento y los valores de las paleolatitudes no varían significativamente. Un error tan alto se debe a que hay una mezcla de 2 grupos de datos, uno con inclinaciones someras y latitudes cercanas a su posición actual y otro con inclinaciones mayores y latitudes en el hemisferio sur. Por esto, se aplicó un filtro de inclinaciones muy altas y bajas, dejando las intermedias, obteniendo un nuevo factor de aplanamiento de 0,93 ± 0,22. El método de corrección usando el filtro de inclinaciones muy altas y bajas en datos de la Cordillera Oriental es efectivo para corregir inclinaciones intermedias-altas en rocas del Jurásico Inferior.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Paleogeographic reconstructions and tectonic models are complemented by paleomagnetism, since vertical axis rotations are calculated using magnetic declination, and paleolatitudes are derived from magnetic inclination. In siliciclastic rocks, the flattening process may cause inclination shallowing and, therefore, an underestimation of paleolatitudes. Different techniques have been proposed to calculate the flattening factor, however, some require massive databases and demanding or specialized laboratory processes. A less-used method that combines the Anisotropy of Magnetic Susceptibility and Paleomagnetism allows us to calculate the flattening factor. Results of Anisotropy of Magnetic Susceptibility in samples of the Girón Group and the results of inclination shallowing are reported for a total of 103 sites in rocks from the Triassic to the Cenozoic distributed in the Eastern Cordillera, Santander Massif and Catatumbo. Four filters were applied to the data set and four curve fit models were run, the mean flattening value calculated is 1.04 ± 0.6, suggesting that the magnetic inclination has not been affected by inclination shallowing, therefore, the paleolatitude values do not vary significantly. However, such a high error is due to a mixture of two groups of data, one with shallow inclinations and latitudes close to its current position and another group with greater inclinations and latitudes in the southern hemisphere. Based on this premise, we applied a new filter of very high and shallow inclinations, leaving the intermediate ones, to obtain a flattening factor of 0.93 ± 0.22. The correction method using the new filter in the Eastern Cordillera data set is effective in correcting medium to high inclinations in Lower Jurassic rocks.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cordillera Oriental]]></kwd>
<kwd lng="es"><![CDATA[Susceptibilidad magnética]]></kwd>
<kwd lng="es"><![CDATA[Corrección]]></kwd>
<kwd lng="es"><![CDATA[Curve fit]]></kwd>
<kwd lng="es"><![CDATA[Paleolatitud]]></kwd>
<kwd lng="en"><![CDATA[Eastern Cordillera]]></kwd>
<kwd lng="en"><![CDATA[Magnetic susceptibility]]></kwd>
<kwd lng="en"><![CDATA[Correction]]></kwd>
<kwd lng="en"><![CDATA[Curve fit]]></kwd>
<kwd lng="en"><![CDATA[Paleolatitude]]></kwd>
</kwd-group>
</article-meta>
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