<?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>S1026-87742019000300411</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2019.3.1528</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Unblocking temperature of secondary magnetic component to outline anomaly thermomagnetic maps of archaeological fireplaces from the southern region of Mexico City, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Temperatura de desbloque de la componente magnética secundaria usada para delimitar mapas de anomalías termomagnéticas en fogones arqueológicos al sur de la ciudad de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Cardona]]></surname>
<given-names><![CDATA[Arnaldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alva-Valdivia]]></surname>
<given-names><![CDATA[Luis Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acosta-Ochoa]]></surname>
<given-names><![CDATA[Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Agarwal]]></surname>
<given-names><![CDATA[Amar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-y-Cruz]]></surname>
<given-names><![CDATA[Tamara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[McClung de Tapia]]></surname>
<given-names><![CDATA[Emily]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica Posgrado en Ciencias de la Tierra]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica Laboratorio de Paleomagnetismo]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Investigaciones Antropológicas ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,University of Freiburg Institute of Earth and Environmental Sciences, Geology ]]></institution>
<addr-line><![CDATA[Freiburg ]]></addr-line>
<country>Germany</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>36</volume>
<numero>3</numero>
<fpage>411</fpage>
<lpage>418</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742019000300411&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742019000300411&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742019000300411&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We report a magnetic study of two preceramic hearths located at the southern region of Mexico City. Thermal demagnetization was applied between 200 to 540 °C to define the remanent magnetization components. The maximum unblocking temperature of the secondary magnetic component reached due to the last heating was identified in most samples. They were used to develop thermomagnetic anomaly source maps. The direction of this component was used to place the blocks to their last cooling spot and configurate a real and primal magnetic anomaly map produced by the thermoremanent magnetization acquired. A protocol to relocate blocks frame is proposed using geomagnetic secular variation curves. The thermomagnetic mapping revealed the position and temperature (220 to 460 °C) of the last heat sources. The distribution of these sources allowed to model an extensional zone of benefit and probable uses of the hearths.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Reportamos un estudio magnético de dos fogones pre-cerámicos ubicados en la región sur de la Ciudad de México. Se aplicó una desmagnetización térmica entre 200y 400 °Cpara definir las componentes de magnetización remanente. Se identificó la temperatura de desbloqueo máxima de la componente magnética secundaria debida al último calentamiento de la mayoría de las muestras. Esta temperatura se utilizó para elaborar mapas de las fuentes de las anomalías termomagnéticas. La dirección de esta componente se usó para colocar los bloques en la posición de su último calentamiento y así configurar un mapa real de anomalía magnética prehistórica producido por la magnetización termoremanente adquirida. Se propone un protocolo para reubicar los bloques usando curvas de variación secular del campo geomagnético. Los mapas termomagnéticos revelaron la posición y temperatura (200 a 460 °C) de las últimas fuentes de calor de cada fogón. La distribución de estas fuentes, permiten modelar la extensión de la zona de beneficio y probable uso de los fogones.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[magnetic anomaly mapping]]></kwd>
<kwd lng="en"><![CDATA[hearths]]></kwd>
<kwd lng="en"><![CDATA[Playa Phase]]></kwd>
<kwd lng="en"><![CDATA[southern Mexico City]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[mapeo de anomalías magnéticas]]></kwd>
<kwd lng="es"><![CDATA[fogones]]></kwd>
<kwd lng="es"><![CDATA[Fase Playa]]></kwd>
<kwd lng="es"><![CDATA[sur Ciudad de México]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
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