<?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>S1026-87742016000100105</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estratigrafía de las áreas cumbrales de las Sierras Pampeanas de Córdoba: geocronología, modelo regional, paleoambiente y paleoclima en una región poco conocida de Argentina]]></article-title>
<article-title xml:lang="en"><![CDATA[Stratigraphy of summit areas of the Sierras Pampeanas of Córdoba: geochronology, regional model, paleoenvironment and paleoclimate in a little-known region of Argentina]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Krapovickas]]></surname>
<given-names><![CDATA[Jerónimo Matías]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tauber]]></surname>
<given-names><![CDATA[Adan Alejo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Córdoba Facultad de Ciencias Exactas, Físicas y Naturales ]]></institution>
<addr-line><![CDATA[ Córdoba]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Consejo Nacional de Investigaciones Científicas y Técnicas  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Museo Provincial de Ciencias Naturales "Dr. Arturo Umberto Illía"  ]]></institution>
<addr-line><![CDATA[ Córdoba]]></addr-line>
<country>Argentina</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>105</fpage>
<lpage>121</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742016000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742016000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742016000100105&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El sistema de Sierras Pampeanas Orientales se extiende en un amplio sector del centro-oeste de la Argentina conformando el antepaís andino central y posee superficies de aplanamiento de origen erosivo en las áreas cumbrales, denominadas "pampas de altura". Los estudios estratigráficos cenozoicos en estas áreas son puntuales, producto quizás de la poca continuidad de la estratigrafía y el difícil acceso a las áreas de estudio, siendo relegadas a investigaciones tradicionales dentro de la llanura pampeana argentina. Se pretende con este trabajo, realizar un análisis comprensivo del registro estratigráfico de estas "pampas de altura", con una visión integradora, que permita analizar su significado paleoclimático, paleoambiental y geocronológico y aportar un marco para futuros estudios en la región. El análisis estratigráfico y sedimentario permitió identificar 5 facies en las pampas de altura de las Sierras Pampeanas de Córdoba: 1Limo arenoso con megatabiques de carbonato de calcio; 2Arena limosa pardo rojiza con clastos; 3Arena limosa laminada y cementada; 4Limo arenoso amarillento; y 5-Arena limosa oscura maciza. Estas facies fueron agrupadas en asociación de facies fluviales/eólicas. Se incluyeron a estas facies en nueva formación denominada Vaca Corral y tiene una edad entre los 37,095 ± 2,020 (OSL) y 7,206 cal. (AMS) años AP. La evidencia permitió hipotetizar un paleoambiente análogo a las sabanas y/o praderas actuales para las pampas de altura tratadas en este trabajo durante el Pleistoceno Tardío y gran parte del Holoceno. Las comunidades vegetales habrían estado dominadas por pasturas, arbustos de pequeño porte y bosques en galería. No se registraron grandes cauces de ríos y probablemente fueron frecuentes los anegamientos estacionales poco profundos. A partir del Holoceno medio se registra un cambio climático a condiciones más húmedas y frías, con un remplazo en la dominancia de las gramíneas por árboles y arbustos. Estas condiciones se habrían mantenido hasta 1,500 años AP. La evidencia discutida aquí, litológica, pedogenética y temporal, permiten hipotetizar una posible resiliencia del sistema serrano, que lo hizo menos propenso a cambios climáticos muy drásticos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Eastern Sierras Pampeanas system spreads over a vast centerwest area of Argentina forming the central Andean foreland; it presents plain surfaces, paleosurfaces of erosive origin their mountain summits, called "Pampas de Altura". The Cenozoic stratigraphic studies in these areas are punctual, perhaps, product of the lack of continuity of stratigraphy and the difficult access to areas of study, being relegated to traditional research inside the Pampas of Argentina. This work aims to perform a comprehensive analysis of stratigraphic registry of this "Pampas de Altura", with an integrated vision, in order to analyze their paleoclimatic, paleoenvironmental and geochronological significance and provide a framework for future studies in the region. The stratigraphic and sedimentary analysis identified five facies within Cordoba's Pampas de Altura. This is to say: 1) sandy-silt with calcium carbonate megatabiques, 2) red silty-sand with clasts, 3) laminated and cemented silty-sands, 4) yellowish massive sandy-silt with clasts and 5) dark massive sandy silt. These facies were grouped into associated fluvial/Aeolian facies. These facies were included in a lithostratigraphic unit named Vaca Corral Formation, and has an age between 37,095 ± 2,020 (OSL) and 7,206 cal. (AMS) yr. BP. The evidence allowed hypothesizing a paleoenvironment similar to the current savannah and/ or grassland for the Pampa de Altura's, discussed in this work, during the Late Pleistocene period and most of the Holocene period as well. Vegetal communities would have been dominated by grasslands, smallsize bushes and gallery forests. Great rivers tracks were not registered and probably seasonal floods were frequent at that time. From the middle Holocene period climate change to more wet and cold conditions is registered, with a replacement in the dominance of grasses by trees and shrubs. These conditions would have remained up to 1,500 year BP. The evidence discussed here, lithological, pedogenetic and temporary, permits us to hypothesize a possible resilience of the mountain system; which became less susceptible to drastic climate changes.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Sierras Pampeanas]]></kwd>
<kwd lng="es"><![CDATA[Pampas de Altura]]></kwd>
<kwd lng="es"><![CDATA[Cuaternario]]></kwd>
<kwd lng="es"><![CDATA[modelo regional]]></kwd>
<kwd lng="es"><![CDATA[paleoclima]]></kwd>
<kwd lng="es"><![CDATA[paleoambiente]]></kwd>
<kwd lng="es"><![CDATA[Argentina]]></kwd>
<kwd lng="en"><![CDATA[Sierras Pampeanas]]></kwd>
<kwd lng="en"><![CDATA[Pampas de Altura]]></kwd>
<kwd lng="en"><![CDATA[Quaternary]]></kwd>
<kwd lng="en"><![CDATA[regional model]]></kwd>
<kwd lng="en"><![CDATA[paleoclimate]]></kwd>
<kwd lng="en"><![CDATA[palaeoenvironment]]></kwd>
<kwd lng="en"><![CDATA[Argentina]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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