<?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>S1026-87742019000100027</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2019.1.749</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Apatite U-Pb dating at UNAM laboratories: analytical protocols and examples of its application]]></article-title>
<article-title xml:lang="es"><![CDATA[Datación de apatita por el método U-Pb en laboratorios de la UNAM: protocolos analíticos y ejemplos de aplicación]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega-Obregón]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abdullin]]></surname>
<given-names><![CDATA[Fanis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solari]]></surname>
<given-names><![CDATA[Luigi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Schaaf]]></surname>
<given-names><![CDATA[Peter]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís-Pichardo]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias ]]></institution>
<addr-line><![CDATA[Querétaro Qro]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias ]]></institution>
<addr-line><![CDATA[Juriquilla Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</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>1</numero>
<fpage>27</fpage>
<lpage>37</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742019000100027&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742019000100027&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742019000100027&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Apatite is the most common phosphate mineral in the Earth's crust and can be found in practically all magmatic and metamorphic rocks, as well as in ancient and recent sediments and in certain ore deposits. Its effective closure temperature of450-550 °C for the U-Pb system makes apatite an important natural medium-temperature thermochronometer that can be dated by both laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and isotope dilution thermal ionization mass spectrometry (ID-TIMS) techniques. Due to its low U content, coupled with high Pb contents incorporated during crystallization (also called common lead), apatite U-Pb dating is analytically challenging, and requires robust analytical protocols to achieve reliable ages. In this experimental study we obtained apatite U-Pb ages from six rock samples employing LA-ICP-MS (at Laboratorio de Estudios Isotópicos, Centro de Geociencias, UNAM), while one sample was also dated by ID-TIMS (at Laboratorio Universitario de Geoquímica Isotópica, UNAM). These samples have igneous emplacement or metamorphic ages broadly ranging from the Neoproterozoic to the Paleocene. The obtained apatite U-Pb ages agree well with other radioisotopic data (U-Pb on zircon and K-Ar or Ar-Ar on micas and hornblende) available for the same rock samples tested, or for the same geological units studied. These apatite U-Pb results, obtained for the first time at two main Mexican geochronology laboratories, are precise enough to be geologically meaningful and usually represent the cooling ages; though, in some cases they may also indicate the crystallization or the metamorphic age. Some advantages and disadvantages of LA-ICP-MS- and ID-TIMS-based methodologies were observed and outlined. Our results validate the analytical procedures used and will serve as an important trigger towards the development or improvement of medium-temperature thermochronology techniques in Mexico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El apatito es el mineral de fosfato más común en la corteza de la Tierra y puede encontrarse en casi todas las rocas magmáticas y metamórficas, así como en algunos sedimentos antiguos y recientes y en ciertos depósitos minerales. La temperatura de cierre efectiva de 450-550 °Cpara el sistema U-Pb hace que el apatito sea un importante termocronómetro natural de temperatura media, el cual se puede fechar tanto por la técnica de ablación láser asociada a un espectrómetro de masas con fuente de plasma de acoplamiento inductivo (LA-ICP-MS, por sus siglas en inglés) como por el método de dilución isotópica usando espectrometría de masas con ionización térmica (ID-TIMS, por sus siglas en inglés). Debido a su bajo contenido de U, aunado a un alto contenido de plomo incorporado durante la cristalización (denominado también plomo común), la datación U-Pb en apatitos es un proceso retador que requiere protocolos analíticos robustos para obtener edades confiables. En este estudio experimental hemos obtenido edades U-Pb en apatitos de seis muestras analizadas por LA-ICP-MS en el Laboratorio de Estudios Isotópicos, Centro de Geociencias, UNAM, así como en una muestra mediante ID-TIMS en el Laboratorio Universitario de Geoquímica Isotópica, UNAM. Estas muestras tienen edades ígneas o de metamorfismo que varían en un rango amplio, desde el Neoproterozoico hasta el Paleoceno. Las edades U-Pb determinadas en apatitos concuerdan bien con otros datos radioisotópicos (e.g., U-Pb en circones y K-Ar y Ar-Ar en micas y hornblenda) disponibles para las mismas muestras de roca analizadas, o para las mismas unidades geológicas estudiadas. Las edades U-Pb de apatitos, obtenidas por primera vez en dos principales laboratorios mexicanos de geocronología, son suficientemente precisas para tener algún sentido geológico e indican usualmente las edades de enfriamiento (tres muestras), aunque en algunos casos pueden señalar también las edades de cristalización o de metamorfismo. Algunas ventajas y desventajas entre las metodologías basadas en LA-ICP-MS e ID-TIMS fueron también observadas y señaladas. Los resultados de este studio validan los procedimientos analíticos utilizados y servirán como un inicio importante hacia el desarrollo o mejoramiento de las técnicas de termocronología de media temperatura en México.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[apatite]]></kwd>
<kwd lng="en"><![CDATA[laser ablation, isotope dilution]]></kwd>
<kwd lng="en"><![CDATA[U-Pb dating]]></kwd>
<kwd lng="en"><![CDATA[thermochronology]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[apatito]]></kwd>
<kwd lng="es"><![CDATA[ablación láser]]></kwd>
<kwd lng="es"><![CDATA[dilución isotópica]]></kwd>
<kwd lng="es"><![CDATA[datación U-Pb]]></kwd>
<kwd lng="es"><![CDATA[termocronología]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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