<?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>S1026-87742005000100001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Influencia de la estratigrafía y estructura geológica en el flujo de agua subterránea del Valle de Querétaro]]></article-title>
<article-title xml:lang="en"><![CDATA[Influence of the stratigraphy and geologic structures on the groundwater flow, Querétaro Valley]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carreón-Freyre]]></surname>
<given-names><![CDATA[Dora]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerca]]></surname>
<given-names><![CDATA[Mariano]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Luna-González]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gámez-González]]></surname>
<given-names><![CDATA[Francisco J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geografía ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Comisión Nacional del Agua  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<volume>22</volume>
<numero>1</numero>
<fpage>1</fpage>
<lpage>18</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742005000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742005000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742005000100001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Para este trabajo se llevó a cabo una revisión del modelo existente sobre el sistema acuífero y la geología del Valle de Querétaro. Se incorpora una interpretación sobre la estratigrafía de la secuencia terciaria en el Valle de Querétaro, basada en los registros litológicos de 70 pozos de aprovechamiento de agua. Para la evaluación de las condiciones de flujo de agua subterránea se integraron las mediciones de 32 pozos de monitoreo, y los datos de niveles piezométricos de 196 pozos medidos entre los años de 1970 y 2003. En el Valle de Querétaro, la carga hidráulica ha disminuido entre 10 y 160 m durante las ultimas dos décadas. El análisis de la evolución piezométrica muestra que el descenso ha sido diferencial, y se infiere que estas variaciones están influenciadas por las discontinuidades estratigráficas y estructurales. En particular las variaciones en el tiempo del nivel piezométrico registrado en pozos localizados a ambos lados de la Falla Central, sugieren que esta estructura constituye una frontera que delimita compartimentos hidráulicos diferentes dentro del sistema acuífero. El análisis de isótopos ambientales (&#948;18O y &#948;D) sugiere que el agua subterránea en el valle no proviene directamente de la recarga vertical. De acuerdo a las propiedades físicas, que se pueden atribuir a las diferentes unidades estratigráficas, el modelo propuesto para el acuífero del Valle de Querétaro es del tipo multicapa con un sistema de flujo intermedio entre local y regional.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In this work we review the existing models on the aquifer system and geology of the Valley of Queretaro. The interpretation of the lithological record in 70 water extraction wells helped to detail the stratigraphy of the first 200 m. In order to evaluate the characteristics of the groundwater flow, 32 monitoring wells and the measured piezometric levels of 196 wells for an interval between 1970 and 2003 were compiled. The hydraulic head has decreased between 10 and 160 m during the last two decades. The analysis of the piezometric evolution shows that the differences in the groundwater withdrawal are delineated by the stratigraphic and structural discontinuities. Variations in time of the piezometric levels of wells located in both sides of the Falla Central suggest that this structure act as a boundary between different hydraulic compartments. The isotopic analysis of &#948;18O and &#948;D suggest that groundwater in the valley is not influenced directly by vertical recharge. According to the physical properties of the stratigraphic units, a multilayer aquifer model for the Valley of Queretaro, with a flow regime between local and regional is proposed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hidrogeología]]></kwd>
<kwd lng="es"><![CDATA[fracturamiento]]></kwd>
<kwd lng="es"><![CDATA[secuencia estratigráfica]]></kwd>
<kwd lng="es"><![CDATA[cuenca sedimentaria]]></kwd>
<kwd lng="es"><![CDATA[Querétaro]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[Hydrogeology]]></kwd>
<kwd lng="en"><![CDATA[fracturing]]></kwd>
<kwd lng="en"><![CDATA[stratigraphic sequence]]></kwd>
<kwd lng="en"><![CDATA[sedimentary basin]]></kwd>
<kwd lng="en"><![CDATA[Querétaro]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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