<?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>S1026-87742015000200283</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Modificaciones fosildiagenéticas en Toxodon platensis Owen, 1837 (Notoungulata, Toxodontidae) del Pleistoceno Tardío de la provincia de Corrientes, Argentina]]></article-title>
<article-title xml:lang="en"><![CDATA[Fossil-diagenetic modifications in Toxodon platensis Owen, 1837 (Notoungulata, Toxodontidae) from the Late Pleistocene of Corrientes Province, Argentina]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tomassini]]></surname>
<given-names><![CDATA[Rodrigo L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miño-Boilini]]></surname>
<given-names><![CDATA[Ángel R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zurita]]></surname>
<given-names><![CDATA[Alfredo E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montalvo]]></surname>
<given-names><![CDATA[Claudia I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cesaretti]]></surname>
<given-names><![CDATA[Nora]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional del Sur Departamento de Geología ]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional del Nordeste  ]]></institution>
<addr-line><![CDATA[Corrientes ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de La Pampa  ]]></institution>
<addr-line><![CDATA[La Pampa ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional del Sur Departamento de Geología ]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<volume>32</volume>
<numero>2</numero>
<fpage>283</fpage>
<lpage>292</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742015000200283&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742015000200283&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742015000200283&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se analizaron las características fosildiagenéticas, incluyendo aspectos mineralógicos, geoquímicos y paleohistológicos, presentes en costillas de Toxodon platensis Owen (Mammalia, Notoungulata, Toxodontidae). Los restos analizados provienen de los depósitos de llanura de inundación de la Formación Toropí/Yupoí asignados al Pleistoceno Tardío, aflorantes en la provincia de Corrientes (Región Mesopotámica, Argentina). Los componentes minerales principales de las costillas incluyen hidroxiapatita y dahllita. El color negro reconocido en algunos ejemplares está relacionado a impregnaciones debido a la precipitación de óxidos de hierro. La microestructura ósea evidencia un grado de preservación bueno, aunque en todos los ejemplares se reconoció el desarrollo de numerosas microgrietas radiales asociadas a las osteonas secundarias. Los óxidos de hierro rellenan la mayoría de las cavidades correspondientes a los elementos microestructurales (canales de Havers y Volkmann, lagunas de osteocitos y canalículos) y las microgrietas radiales, y también generaron reemplazos en distintos sectores de la matriz ósea. La información obtenida permite inferir que las historias tafonómicas de los materiales analizados tienen una estrecha relación con las características del ambiente de preservación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Fossil-diagenetic features, including mineralogical, geochemical and paleohistological aspects, present in ribs of Toxodon platensis Owen (Mammalia, Notoungulata, Toxodontidae) were analyzed. Remains were recovered from floodplain deposits of the Toropí/Yupoí Formation assigned to the Late Pleistocene, cropping out in Corrientes Province (Mesopotamian Region, Argentina). The main mineral components of the ribs include hydroxyapatite and dahllite. The black color identified on the outer surface of some remains is related to impregnations due to precipitation of iron oxides. Original bone microstructure shows good preservation, but numerous radial microcracks were identified in the secondary osteons of all specimens. Iron oxides fill most microstructural features (Havers and Volkmann canals, osteocyte lacunae and canaliculi) and radial microcracks, and also replaced diverse areas of the bone matrix. The obtained information allows interpreting that the taphonomic histories of these remains are closely related to the particular characteristics of the environment of preservation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[tafonomía]]></kwd>
<kwd lng="es"><![CDATA[fosildiagénesis]]></kwd>
<kwd lng="es"><![CDATA[megamamíferos]]></kwd>
<kwd lng="es"><![CDATA[Toxodon platensis]]></kwd>
<kwd lng="es"><![CDATA[Cuaternario]]></kwd>
<kwd lng="es"><![CDATA[Argentina]]></kwd>
<kwd lng="en"><![CDATA[taphonomy]]></kwd>
<kwd lng="en"><![CDATA[fossil-diagenesis]]></kwd>
<kwd lng="en"><![CDATA[megamammals]]></kwd>
<kwd lng="en"><![CDATA[Toxodon platensis]]></kwd>
<kwd lng="en"><![CDATA[Quaternary]]></kwd>
<kwd lng="en"><![CDATA[Argentina]]></kwd>
</kwd-group>
</article-meta>
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