<?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>S1026-87742016000100034</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Paleoclimate, paleoweathering and paleoredox conditions of Lower Cretaceous shales from the Mural Limestone, Tuape section, northern Sonora, Mexico: Constraints from clay mineralogy and geochemistry]]></article-title>
<article-title xml:lang="es"><![CDATA[Condiciones de paleoclima, paleointemperismo y paleoredox de lutitas del Cretácico Inferior de la caliza Mural, sección Tuape, norte de Sonora, México: restricciones a partir de mineralogía de arcillas y geoquímica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Madhavaraju]]></surname>
<given-names><![CDATA[Jayagopal]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Montoya]]></surname>
<given-names><![CDATA[Erik]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monreal]]></surname>
<given-names><![CDATA[Rogelio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-León]]></surname>
<given-names><![CDATA[Carlos M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pi-Puig]]></surname>
<given-names><![CDATA[Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinoza-Maldonado]]></surname>
<given-names><![CDATA[Inocente G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Grijalva-Noriega]]></surname>
<given-names><![CDATA[Francisco J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Sonora Departamento de Geología ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<volume>33</volume>
<numero>1</numero>
<fpage>34</fpage>
<lpage>48</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742016000100034&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742016000100034&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742016000100034&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Clay mineral analysis and major, trace and rare earth elements (REE) data were used in this study to interpret the paleoclimatic changes, paleoweathering and paleo-redox conditions in shale beds of the Tuape section of the Mural Limestone of Sonora. The clay mineralogical assemblages (illite-chlorite-kaolinite-smectite) of this section have provided information on the climatic conditions and environment of deposition that prevailed during late Aptian-early Albian age. The chondrite-normalized REE patterns are characterized by enriched LREE, flat HREE with negative Eu anomaly. The chemical index of alteration (CIA) and plagioclase index of alteration (PIA) values for these shales and A-CN-K diagram indicate a moderate intensity of chemical weathering. The low contents of TOC, TN, Mo, U and V and low Ni/Co and U/Th ratios in the Cerro La Ceja, Los Coyotes and Mesa Quemada members suggest that they have been deposited under oxic conditions. However, the Tuape Shale and Cerro La Puerta members show relatively low to moderate contents of redox sensitive elements, and their ratios suggest that the depositional basin experienced oxic to anoxic depositional conditions.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se realizaron análisis de arcillas minerales, elementos mayores, traza y tierras raras (ETR) para interpretar los cambios paleoclimáticos, el paleointemperismo y las condiciones de paleo-reducción-oxidación en las capas de lutita de la sección Tuape de la Caliza Mural de Sonora. La asociación mineralógica de arcillas (ilita-clorita-caolinita-esmectita) de la sección Tuape proporcionó información sobre las condiciones climáticas y ambientes de depósito que predominaron durante el Aptiano tardío-Albiano temprano. Los patrones de tierras raras normalizados con condrita están caracterizados por el enriquecimiento de tierras raras ligeras (ETRL) y la disminución de tierras raras pesadas (ETRP) con anomalía negativa de Eu. Los valores del índice de alteración química (CIA por sus siglas en inglés) y del índice de alteración de plagioclasas (PIA por sus siglas en inglés) para estas lutitas así como el diagrama A-CN-K, indican que su intemperismo químico es de una intensidad moderada. Los bajos contenidos de carbono orgánico total (COT), nitrógeno total (NT), Mo y V, además de la baja relación Ni/Co y U/Th en los miembros Cerro La Ceja, Los Coyotes y Mesa Quemada sugieren que se depositaron bajo condiciones óxicas. Sin embargo, los miembros Lutita Tuape y Cerro La Puerta muestran contenidos relativamente bajos a moderados de elementos sensibles a reducción-oxidación y sus relaciones sugieren que la cuenca de depósito experimentó condiciones de depósito de óxicas a anóxicas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[geochemistry]]></kwd>
<kwd lng="en"><![CDATA[clay mineralogy]]></kwd>
<kwd lng="en"><![CDATA[paleoclimate]]></kwd>
<kwd lng="en"><![CDATA[paleoweathering]]></kwd>
<kwd lng="en"><![CDATA[paleo-redox conditions]]></kwd>
<kwd lng="en"><![CDATA[Mural Limestone]]></kwd>
<kwd lng="en"><![CDATA[Sonora]]></kwd>
<kwd lng="es"><![CDATA[geoquímica]]></kwd>
<kwd lng="es"><![CDATA[mineralogía de arcillas]]></kwd>
<kwd lng="es"><![CDATA[paleoclima]]></kwd>
<kwd lng="es"><![CDATA[paleointemperismo]]></kwd>
<kwd lng="es"><![CDATA[condiciones de paleo-reducción-oxidación]]></kwd>
<kwd lng="es"><![CDATA[Caliza Mural]]></kwd>
<kwd lng="es"><![CDATA[Sonora]]></kwd>
</kwd-group>
</article-meta>
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