<?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>S1405-33222016000200247</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A new Miocene Formation from The Peotillos-Tolentino Graben fill, Western Sierra Madre Oriental at San Luis Potosí, Mexico: Part 1, Geology]]></article-title>
<article-title xml:lang="es"><![CDATA[Una nueva formación miocénica en el relleno del graben de Peotillos-Tolentino, oeste de la Sierra Madre Oriental de San Luis Potosí, México. Parte 1: Geología]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferrusquía-Villafranca]]></surname>
<given-names><![CDATA[Ismael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-González]]></surname>
<given-names><![CDATA[José E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Hernández]]></surname>
<given-names><![CDATA[José Ramón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Hernández]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gama-Castro]]></surname>
<given-names><![CDATA[Jorge]]></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[México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Instituto de Geología ]]></institution>
<addr-line><![CDATA[San Luis Potosí S.L.P.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<volume>68</volume>
<numero>2</numero>
<fpage>247</fpage>
<lpage>282</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222016000200247&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222016000200247&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222016000200247&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Resumen A pesar de ~130 años de investigación geológica en México, hay aún muchos pendientes e.g. sólo 1/3 del territorio está cartografiado a detalle [i.e. escala 1:50000], la diferenciación estratigráfica del Cenozoico continental sedimentario apenas ha empezado, la discriminación de los sistemas deposicionales que constituyen a las unidades fundamentales, es aún menor. Contribuyendo a llenar este vacío, se revisa la litoestratigrafía cenozoica detallada del relleno de un graben en México centro-oriental, se propone una nueva formación miocénica, y se discute su significado en la evolución geológica regional. El área de estudio se ubica en San Luis Potosí, dentro de la Provincia Morfotectónica Sierra Madre Oriental [SMO], entre 22°11'-22°19' Latitud Norte, 100°30'-100°39' Longitud Oeste, y una Altitud de 1295 - 2025 msnm. La secuencia terciaria [espesor ~1200 m] está preservada en el Graben Peotillos-Tolentino, orientado NNW, delimitado por pilares de unidades cretácicas carbonáticas plegadas y afalladas; incluye una sucesión volcánica paleogénica formada por un cuerpo lávico andesítico-basáltico interdigitado/sobreyacido por un manto de toba riolítica soldada, que a su vez subyace de manera discordante a la nueva unidad, la cual es una gruesa secuencia [~1100 m de espesor] fluviolacustre, principalmente calcilitítica, peneplaneada, e inclinada 15° - 20° al NE; ésta subyace discordantemente un manto cuaternario [~40 m de espesor] calcilutítico-volcarenítico, localmente cubierto por mafititas lávicas y/o piroclásticas La formación nueva se depositó en una cuenca subsidente, bajo condiciones húmedas a subhúmedas que permitieron erosionar grandes volúmenes clásticos, y desarrollar una red fluvial axial, capaz de transportarlos/depositarlos. Empero los calcisoles y calcretas de las planicies de inundación indican períodos de sequía. Se formó así un cuerpo estratiforme [espesor ~1100 m] que registró la sobreposición cíclica de sistemas deposicionales ocurrida durante el Mioceno Tardío; esto denota estabilidad de las condiciones tectono-sedimentario-climáticas. Posteriormente, acaeció fallamiento, erosión y finalmente peneplaneación; en el Cuaternario, se restableció la sedimentación clástica. El enfoque holístico usado en el estudio del Graben Peotillos-Tolentino y de su relleno sedimentario, podría aplicarse a las otras depresiones post-orogénicas de la Sierra Madre Oriental, portadoras de secuencias clásticas cenozoicas, probablemente resultantes de procesos similares, para identificar y caracterizar dichos procesos, contribuyendo así a entender mejor la constitución y evolución cenozoica de esta provincia morfotectónica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Abstract In spite of ~130 years of geologic research in Mexico, much remains pending e.g. only 1/3 of this country's territory is mapped in detail [i.e., scale 1:50000], the formal stratigraphic differentiation of the continental sedimentary Cenozoic is barely started, discriminating the depositional systems that make up basic units is even less pursued. Towards filling this gap, the detailed Cenozoic lithostratigraphy of a graben fill in central-east Mexico is reviewed, a new Miocene formation is proposed, and its importance in understanding the regional geologic evolution is discussed. The study area lies in San Luis Potosí State, within the Sierra Madre Oriental Morphotectonic Province [SMO], between 22°11'-22°19' N Lat. and 100°30'-100°39' W Long., and 1295 - 2025 masl. The ~1200 m thick Tertiary sedimentary sequence is preserved in the N-S trending Peotillos-Tolentino Graben, which is bound by horsts of folded and faulted Cretaceous carbonate units; it includes a Paleogene volcanic succession formed by an andesitic-basaltic lavic stack intertongued/overlain by a rhyolitic ash flow-tuff sheet, which non-conformably underlies the new unit, a Late Miocene, ~1100 m thick, fluvio-lacustrine, largely calcilithitic, 15° - 20° NE dipping, peneplained sequence, in turn unconformably overlain by a Quaternary, ~40 m thick, calcilithitic-volcarenitic blanket; locally overlain by mafic lavic/pyroclastic rocks. The new formation was deposited in a subsiding basin, under humid to subhumid conditions allowing erosion of large clastics volumes, and the development of an axial fluvial network, capable of transporting/depositing such volumes. Nevertheless, floodplain calcisols and calcretes indicate periods of dry conditions. The ~1100 m thick, largely fluvial stratal pile thus formed, records cyclic superimposing of such network's systems during Late Miocene time; this in turn, denotes stability of the tectono-sedimentary-climatic conditions. Subsequently, faulting, erosion and finally peneplanation took place. In the Quaternary, clastic sedimentation was reestablished. The holistic approach used to study the Peotillos-Tolentino Graben and its sedimentary fill, could be applied to the other post-orogenic basins of the Sierra Madre Oriental that bear Cenozoic clastic sequences, probably resulting from similar processes, to identify and characterize such processes, thus contributing to a better understanding of the Cenozoic geologic makeup and evolution of this province.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[Miocene]]></kwd>
<kwd lng="es"><![CDATA[continental lithostratigraphy]]></kwd>
<kwd lng="es"><![CDATA[depositional systems]]></kwd>
<kwd lng="es"><![CDATA[tectono-sedimentary evolution]]></kwd>
<kwd lng="es"><![CDATA[paleosols]]></kwd>
<kwd lng="en"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[Mioceno]]></kwd>
<kwd lng="en"><![CDATA[litoestratigrafía continental]]></kwd>
<kwd lng="en"><![CDATA[sistemas deposicionales]]></kwd>
<kwd lng="en"><![CDATA[evolución tectono-sedimentaria]]></kwd>
<kwd lng="en"><![CDATA[paleosuelos]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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</article>
