<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222021000100006</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2021v73n1a080620</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evolución paleoambiental de la diatomita de Agostitlán, Michoacán, durante la transición Pleistoceno-Holoceno]]></article-title>
<article-title xml:lang="en"><![CDATA[Paleoenvironmental evolution of the Agostitlán diatomite, Michoacán, during the Pleistocene-Holocene transition]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-González]]></surname>
<given-names><![CDATA[Ma. de Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Israde Alcántara]]></surname>
<given-names><![CDATA[Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales]]></surname>
<given-names><![CDATA[Juan Julio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Goguitchaichvili]]></surname>
<given-names><![CDATA[Avto]]></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[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Instituto de Investigaciones en Ciencias de la Tierra ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Unidad Michoacán del Instituto Geofísica Laboratorio Interinstitucional de Magnetismo Natural]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<volume>73</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222021000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222021000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222021000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El graben de Chapala-Acambay se caracteriza por el registro de yacimientos de diatomitas del Cuaternario con espesores variables, donde domina flora indicativa de lagos profundos. El depósito de diatomita de 6.70 m de espesor de la cuenca de represamiento de Agostitlán contiene un registro paleoambiental que marca la transición de condiciones menos frías de hace ca. 37,000 años cal aP hasta el inicio del Glacial tardío ca. 25,000 años cal aP En el inicio de la formación del represamiento se desarrolló un cuerpo de agua profundo con dominio de Stephanodiscus niagarae, con escaso aporte de material detrítico dominando las facies arcillosas. Los valores de susceptibilidad magnética en este primer episodio del lago son bajos, con un par de notorios incrementos en la susceptibilidad magnética y asociados a periodos de erosión de las sierras altas que limitan la cuenca. Sucesivamente, hacia las condiciones del lago se vuelven fluctuantes; las facies sedimentarias son más detríticas, alternando con episodios de sedimentación fina, disminuyen las agrupaciones de Stephanodiscus spp y aumentan los porcentajes de Aulacoseira ambigua y Fragilaria spp, lo que sugiere condiciones más frías y alcalinas. La cima de la sucesión se caracteriza por un aumento en la concentración de los minerales magnéticos, así como por un descenso significativo de las especies planctónicas y ticoplanctónicas que vienen sustituidas por formas bentónicas y perifíticas, lo cual se interpreta como una respuesta al incremento de la aridez en esta zona, previo al inicio del Último Máximo Glacial.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Chapala Acambay graben is characterized by several Quaternary diatomite deposits of variable thickness where dominates flora indicative of' ancient deep lakes. The 6.70 m thickness diatomite-deposit of the Agostitlan dammed basin contains the paleoenvironmental record that show the transitionfrom less cold conditions of 37,000 yr cal AP until the onset of the late Glacial period (ca. 25,000yr cal AP). At the beginning of the lake formation a deep-water body was developed, characterized mostly by Stephanodiscus niagarae with little contribution of detrital material, mostly composed of argillaceous lithology. The magnetic susceptibility values in this first episode of tie lake are relatively low, at least in the first two meters, with two notorious maxima associated with periods of erosion of the high-mountain ranges. Successively towards the Early Glacier the lake conditions become fluctuating; the sedimentation is more detrital, alternating with episodes of fine sedimentation in which the lowest values of magnetic susceptibility are revealed, which are accompanied by the decrease of Stephanodiscus spp communities and an increase of Aulacoseira ambigua and Fragilaria spp. This indicates an environment of dominantly cold and alkaline conditions. The top of the succession is characterized by an increase in the concentration of magnetic minerals, as well as by a significantly decrease of planktonic that becomes substituted by littoral benthic and periphytic species, which are interpreted as the response to the increase in aridity in this area at the beginning of the Last Glacial Maximum.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Diatomitas]]></kwd>
<kwd lng="es"><![CDATA[México Central]]></kwd>
<kwd lng="es"><![CDATA[Magnetismo Ambiental]]></kwd>
<kwd lng="es"><![CDATA[MIS3]]></kwd>
<kwd lng="es"><![CDATA[Wisconsin tardío]]></kwd>
<kwd lng="en"><![CDATA[Diatomitas]]></kwd>
<kwd lng="en"><![CDATA[Central Mexico]]></kwd>
<kwd lng="en"><![CDATA[Environmental Magnetism]]></kwd>
<kwd lng="en"><![CDATA[MIS3]]></kwd>
<kwd lng="en"><![CDATA[late Wisconsin]]></kwd>
</kwd-group>
</article-meta>
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