<?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>S1026-87742018000200116</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2018.2.397</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Chemical and isotopic signatures of hot springs from east-central Sonora State, Mexico: a new prospection survey of promissory low-to-medium temperature geothermal systems]]></article-title>
<article-title xml:lang="es"><![CDATA[Firmas químicas e isotópicas de manantiales termales de la zona este-centro del Estado de Sonora, México: una nueva prospección de sistemas geotérmicos promisorios de baja a media temperatura]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almirudis]]></surname>
<given-names><![CDATA[Erika]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santoyo-Gutierrez]]></surname>
<given-names><![CDATA[Edgar R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guevara]]></surname>
<given-names><![CDATA[Mirna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz-Moreno]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Portugal]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Energías Renovables ]]></institution>
<addr-line><![CDATA[Temixco Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Energías Renovables ]]></institution>
<addr-line><![CDATA[Temixco Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Sonora Departamento de Geología ]]></institution>
<addr-line><![CDATA[Hermosillo Son.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Electricidad y Energías Limpias  ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>35</volume>
<numero>2</numero>
<fpage>116</fpage>
<lpage>141</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742018000200116&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742018000200116&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742018000200116&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: A promissory low-to-medium temperature geothermal system located in Sonora (Mexico) has been studied. In the present work, a detailed geochemical survey was carried out to understand the hydrogeochemical signatures of hot spring waters. A field work campaign was conducted for collecting water samples from twelve hot springs placed in four major zones (NW, NE, C, and S). The collected samples were analysed by chemical and isotopic methods for determining their chemical (major and trace elements) and isotopic (18O/16O and D/H) compositions. Using geochemometric analyses of the fluid composition and fractionation, depletion and enrichment processes exhibited by major and trace elements were analysed. Hydrogeochemical classification was used to indicate the presence of sodium-sulphate (Na-SO4) waters in the North (NW and NE) and South hydrothermal zones; whereas calcium-magnesium-bicarbonate (Ca-Mg-HCO3) waters were identified for the Central zone. Some hot spring waters located in the NE zone were also typified as sodium-bicarbonate (Na-HCO3). In relation to the isotopic signatures of 18O/16O and D/H, four water samples from NE and C zones lie near to the global meteoric water line; whereas the remaining eight samples showed a shift for both oxygen and deuterium isotopes. A mixing line with a small shift of &#948;18O was identified and used as a proxy to discriminate waters with different isotopic signatures. After applying a geochemometric outliers detection/rejection and an iterative ANOVA statistical test, the mean temperature inferred from the most reliable solute geothermometers was 149±40 °C, which suggests to be considered as the minimum value of the reservoir temperature. As most of the hot spring waters fall outside of the full equilibrium curve, the original reservoir conditions were corrected by using a mixing conductive model, which predicted a deep equilibrium temperature of 210±11 °C. As this temperature is considerably higher than the mean temperature inferred from the geothermometers, it was suggested as an optimistic maximum reservoir temperature of the Sonora geothermal system. Using 150 °C and 200 °C as rounded-off reservoir temperatures (or min-max estimates), geochemical equilibria modelling based on fluid-mineral stability diagrams was carried out. An equilibrium process among local hydrothermal waters and albite-potassium feldespar and muscovite-prehnite-laumontite mineral assemblages was found. These minerals were proposed as representative mineral assemblages of low-grade metamorphism, which seems to indicate that the geothermal fluid equilibria were probably reached within the intermediate to acidic volcanic rocks from the Tarahumara Formation.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se estudió geoquímicamente un sistema geotérmico promisorio de baja-media temperatura localizado en el Estado de Sonora (México). En el presente trabajo, se llevó a cabo un estudio geoquímico para entender las firmas hidrogeoquímicas de los manantiales termales. Con estos propósitos, se llevó a cabo una campaña de trabajo de campo para recolectar muestras de agua de doce manantiales termales localizados en cuatro zonas principales (NW, NE, C y S). Las muestras recolectadas se analizaron mediante métodos químicos e isotópicos para determinar sus principales rasgos químicos (elementos mayores y traza) e isotópicos (18O/16O y D/H). Usando las firmas químicas y un análisis geoquimiométrico de la composición del fluido y de los procesos de fraccionamiento se examinaron los procesos de empobrecimiento y enriquecimiento exhibidos por los elementos mayores y traza. La clasificación hidrogeoquímica indicó la presencia de aguas de tipo sulfatadas-sódicas (Na-SO4) en las zonas hidrotermales del Norte (NW y NE) y Sur; mientras que aguas bicarbonatadas-cálcico-magnésicas (Ca-Mg-HCO3) se identificaron en la zona Central. Algunas aguas termales ubicadas en la zona NE se caracterizaron como bicarbonatadas sódicas (Na-HCO3). Con relación a las firmas isotópicas de 18O/16O y D/H, cuatro muestras de agua de las zonas hidrotermales NE y C se ubicaron cerca de la Línea Meteórica Mundial; mientras que las ocho muestras restantes mostraron un desplazamiento tanto para los isótopos de oxígeno como para deuterio. Se identificó una línea de mezclado con un pequeño desplazamiento de &#948;18O, el cual se utilizó como una guía para discriminar aguas con una firma isotópica diferente. A partir de un análisis geoquimiométrico basado en un algoritmo de detección/eliminación de valores discordantes y una prueba iterativa de ANOVA, la temperatura media del yacimiento predicha por los geotermómetros de solutos fue de 149±40 °C, la cual se consideró como la temperatura mínima del yacimiento. Como la mayoría de las aguas termales están fuera del equilibrio, las condiciones originales del yacimiento se corrigieron utilizando un modelo de mezcla, que estima una temperatura de equilibrio profundo de 210±11 °C. Como esta temperatura resultó considerablemente más alta que el valor promedio calculado por los geotermómetros, se refirió a ésta como una estimación optimista o como la temperatura máxima del reservorio geotérmico. Utilizando 150 °C y 200 °C como los valores mínimos y máximos de la temperatura del yacimiento, se desarrolló un modelo de equilibrio basado en diagramas de estabilidad fluido-mineral. Se encontró un proceso de equilibrio entre las aguas termales locales y los sistemas minerales de albita-feldespato potásico y muscovita-prehnita-laumontita. Estos minerales se proponen como un conjunto mineral representativo del metamorfismo de bajo grado, que parecen indicar que se alcanzó el equilibrio de los fluidos geotérmicos con las rocas volcánicas intermedias a ácidas de la Formación Tarahumara.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[exploration]]></kwd>
<kwd lng="en"><![CDATA[geochemometrics]]></kwd>
<kwd lng="en"><![CDATA[low-to-medium enthalpy]]></kwd>
<kwd lng="en"><![CDATA[fluid geochemistry]]></kwd>
<kwd lng="en"><![CDATA[rare-earth elements]]></kwd>
<kwd lng="en"><![CDATA[geothermal energy]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[exploración]]></kwd>
<kwd lng="es"><![CDATA[geoquimiometría]]></kwd>
<kwd lng="es"><![CDATA[baja-mediana entalpía]]></kwd>
<kwd lng="es"><![CDATA[geoquímica de fluidos]]></kwd>
<kwd lng="es"><![CDATA[elementos de las tierras raras]]></kwd>
<kwd lng="es"><![CDATA[energía geotérmica]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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