<?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>S1026-87742018000300254</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2018.3.779</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Reconstrucción paleoambiental de la subcuenca de Xochimilco, centro de México, entre 18000 y 5000 años antes del presente]]></article-title>
<article-title xml:lang="en"><![CDATA[Paleoambiental reconstruction of the Xochimilco sub-basin, central Mexico, between 18000 and 5000 years cal before present]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega-Guerrero]]></surname>
<given-names><![CDATA[Beatriz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Albarrán-Santos]]></surname>
<given-names><![CDATA[Marco Albán]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caballero]]></surname>
<given-names><![CDATA[Margarita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Corona]]></surname>
<given-names><![CDATA[Ismerai]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez-Méndez]]></surname>
<given-names><![CDATA[Brayan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caballero-García]]></surname>
<given-names><![CDATA[Lizeth]]></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 ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Tecnológico de Venustiano Carranza  ]]></institution>
<addr-line><![CDATA[Lázaro Cárdenas Puebla]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>35</volume>
<numero>3</numero>
<fpage>254</fpage>
<lpage>267</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742018000300254&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742018000300254&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742018000300254&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Presentamos un registro de las oscilaciones de escala milenaria de un sitio en la cuenca de Xochimilco (parte central de México) entre ca. 18000 y 5000 años cal AP, derivado de indicadores de mineralogía magnética, contenido de elementos mayores y asociación de diatomeas. La edad de la secuencia sedimentaria analizada está definida por el reconocimiento de dos marcadores estratigráficos ampliamente usados en esta región: la Pómez Tutti Frutti del Popocatépetl (ca. 17070 años cal AP) y la Pómez Toluca Superior del Nevado de Toluca (ca. 12320 años cal AP). Adicionalmente, se dispone de una edad de 14C de un concentrado de ostrácodos. Las variaciones temporales en susceptibilidad magnética (&#967;), abundancia de óxidos y oxihidróxidos de Fe (hematita y goethita), minerales magnéticos ultrafinos, titanio, carbón orgánico e inorgánico, así como las relaciones hierro/titanio, calcio/titanio, carbono orgánico/nitrógeno, silicio/titanio y contenido de diatomeas, indican variaciones en la erosión, origen de los minerales de Fe, salinidad, productividad y origen de la materia orgánica. Estas variaciones responden a oscilaciones climáticas de escalas milenarias. Durante la deglaciación (18000 y 11700 años cal AP), ocurrió una actividad volcánica intensa y este periodo está caracterizado por la dominancia de sedimentación clástica en un lago somero de agua dulce. Los eventos Heinich 1 (frío), Bølling/Allerød (cálido) y Younger Dryas (frío) se documentan con variaciones en la erosión, el contenido de materia orgánica y la precipitación de carbonatos. Durante el Holoceno temprano (11700-8200 años cal AP), se registraron las condiciones más secas de toda la secuencia. El Holoceno medio (8200-5000 años cal AP) registró un retorno a condiciones húmedas y el establecimiento de un lago de agua dulce, que probablemente favorecieron el desarrollo de comunidades en la ribera del lago.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: We present a record of millennial-scale paleoenvironmental variations from a site in Xochimilco basin, central Mexico, between 18000 and 5000 years cal BP, using the magnetic mineralogy, geochemical elements content and diatom assemblages. The analyzed sedimentary sequence is chronologically constrained by the recognition of well-known tephra layers widely used as stratigraphical markers in the region: the Tutti Frutti Pumice from Popocatépetl stratovolcano (17070 years cal BP), and the Upper Toluca Pumice (12320 years cal BP) from the Nevado de Toluca, as well as a 14C date from an ostracod rich horizon. The temporal variations recorded in magnetic susceptibility (&#967;), Fe oxides and oxyhydroxides (hematite and goethite), ultra-fine magnetic minerals, titanium, organic and inorganic carbon, and the iron/titanium, calcium/titanium, organic carbon/nitrogen, silicon/titanium ratios and diatom content indicate fluctuations in runoff, origin of magnetic minerals, salinity, productivity and sources of organic matter. These variations respond to millennial-scale climatic oscillations. The deglacial period (18000-11700 years cal BP) was characterized by intense volcanic activity, and the dominance of clastic sedimentation in a fresh water shallow lake. The Heinrich 1 (cold), Bølling/Allerød (warm) and Younger Dryas (cold) events, were recorded in the runoff, organic matter content and carbonate precipitation proxies. The driest conditions in all of the sequence were recorded during early Holocene (11700-8200 years cal BP). The return to more humid conditions and the establishing of a fresh water lake during the late mid Holocene (8200-5000 years cal BP), could promote the settling of communities on the lake shore.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[oscilaciones climáticas milenarias]]></kwd>
<kwd lng="es"><![CDATA[cuenca de México]]></kwd>
<kwd lng="es"><![CDATA[Holoceno]]></kwd>
<kwd lng="es"><![CDATA[paleoambientes]]></kwd>
<kwd lng="es"><![CDATA[propiedades magnéticas]]></kwd>
<kwd lng="en"><![CDATA[millennial climatic oscillations]]></kwd>
<kwd lng="en"><![CDATA[basin of México]]></kwd>
<kwd lng="en"><![CDATA[central Mexico]]></kwd>
<kwd lng="en"><![CDATA[Holocene]]></kwd>
<kwd lng="en"><![CDATA[paleoenvironments]]></kwd>
<kwd lng="en"><![CDATA[magnetic properties]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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