<?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>S1405-33222018000200531</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2018v70n2a13</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Geochronology of Mexican mineral deposits. VI: the Tayoltita low-sulfidation epithermal Ag-Au district, Durango and Sinaloa]]></article-title>
<article-title xml:lang="es"><![CDATA[Geocronología de depósitos minerales mexicanos. VII: el distrito de depósitos Ag-Au epiternales de baja sulfuración de Tayoltita, Durango y Sinaloa]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Enríquez]]></surname>
<given-names><![CDATA[Erme]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Iriondo]]></surname>
<given-names><![CDATA[Alexander]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camprubí]]></surname>
<given-names><![CDATA[Antoni]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Minera Canasil S.A. de C.V.  ]]></institution>
<addr-line><![CDATA[Durango Dgo.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias ]]></institution>
<addr-line><![CDATA[Santiago de Querétaro Qro.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[CDMX ]]></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>70</volume>
<numero>2</numero>
<fpage>531</fpage>
<lpage>547</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222018000200531&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222018000200531&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222018000200531&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The Tayoltita district (Durango, Mexico) is one of the major silver and gold producers in the world with over 745 million ounces of Ag and 11 million ounces of Au in the entire lifetime of the mine. These high-grade Ag-Au deposits are of low-sulfidation epithermal type, and formed during the final stages of igneous and hydrothermal activity of small Eocene quartz monzonitic and andesitic intrusions. The veins are hosted by tuffs, flows, and agglomerates of Paleocene age that belong to the Lower Volcanic Complex of the Sierra Madre Occidental, and are unconformably overlain by the Miocene Upper Volcanic Supergroup. Three episodes of intrusion have taken place in the district. The presently available ages of the Piaxtla intrusions indicate that the batholithic complex was emplaced between 46.31 and 45.1 Ma. The second event is represented by the so-called Intrusive andesite, which yielded ages that range between 39.9 and 37.9 Ma. The last intrusion event is represented by the Arana diorite. K-Ar ages of these rocks range between 38.1 and 36.6 Ma. Ages obtained in this study and in the available literature allow to establishing that the formation of epithermal veins in the district ranged between 41.01 and 31.9 Ma. Hydrothermal alteration and mineralization occurred within a 0.3 to 3.4 M.yr. time-span after the emplacement of the Intrusive andesite and the Arana diorite, respectively. Such intrusive events are generally acknowledged to have triggered ore formation in this district, thus implying the genetic association between the intrusive rocks and the epithermal deposits. The available 40Ar/39Ar and K-Ar ages of adularia from vein material indicate that vein formation occurred episodically in distinct periods separated by intervals of about 3.18 M.yr., albeit magmatic-hydrothermal activity in the area experienced few lull periods. The total duration of mineralization from the margin to the center of the Tayoltita district was ~10 M.yr., which makes it one of the longest lived known epithermal deposits. However, there is no apparent correlation between the longevity of epithermal deposits and their size. The age of an unaltered tuff of the Upper Volcanic Supergroup that unconformably overlies the Lower Volcanic Complex of the Sierra Madre Occidental indicates that tilting of the units and the activity of the paleo-hydrothermal system had ceased by 20.3 Ma. The temporal and spatial coincidence of volcanism, faulting, and high-grade mineralization may reflect the importance of contributions from deeper fluid reservoirs containing magmatic components or highly exchanged meteoric waters. In this sense, it is worth noting that the 0.3 M.yr. time-span between the emplacement of hypabyssal rocks and immediately subsequent epithermal mineralization is much narrower than the common ~2 M.yr. time-span in most (low and intermediate sulfidation) epithermal deposits in Mexico that are proven to be associated with magmatic fluids, as it is the case of the giant deposits in the Fresnillo district. The short time-span suggests that the emplacement of hypabyssal rocks and epithermal deposits was known to date to have occurred in association with high-sulfidation deposits alone.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El distrito de Tayoltita (Durango, México) es uno de los mayores productores de plata y oro en el mundo con más de 745 millones de onzas de Ag y 11 millones de onzas de Au producidos durante la historia de estas minas. Estos depósitos de alta ley de Ag-Au pertenecen al tipo epitermal de baja sulfuración, y se formaron durante los últimos estadios de la actividad ígnea e hidrotermal de pequeñas intrusiones cuarzo monzoníticas y andesíticas del Eoceno. Las vetas se encuentran encajonadas por tobas, flujos, y aglomerados del Paleoceno, pertenecientes al Grupo Volcánico Inferior de la Sierra Madre Occidental, y son cubiertos discordantemente por rocas más recientes de la Secuencia Volcánica Superior, del Mioceno. En el distrito se produjeron tres episodios de intrusiones. Las edades actualmente disponibles de las intrusiones Piaxtla indican que el complejo se emplazó entre 46.31 y 45.1 Ma. El segundo evento está representado por la denominada andesita Intrusiva, con edades entre 39.9 y 37.9 Ma. El último evento intrusivo está representado por la diorita Arana. Las edades K-Ar de estas rocas varían entre 38.1 y 36.6 Ma. Las edades obtenidas en el presente estudio y en la bibliografía disponible permiten establecer que la formación de las vetas epitermales en el distrito se produjo entre 41.01 y 31.9 Ma. Las alteraciones y mineralizaciones hidrotermales se produjeron entre 0.3 y 3.4 millones de años tras el emplazamiento de la andesita Intrusiva y la diorita Arana, respectivamente. Se acepta generalmente que dichos eventos intrusivos detonaron la formación de menas en este distrito, lo cual implica la existencia de una asociación genética entre las rocas intrusivas y los depósitos epitermales. Las edades disponibles mediante 40Ar/39Ar y K-Ar en adularia procedente de vetas indica que la formación de las vetas se produjo de forma episódica en diferentes periodos separados por intervalos de unos 3.18 millones de años, aunque la actividad magmática-hidrotermal en el área experimentó escasos periodos de inactividad. La duración total de la mineralización desde la periferia a la porción central del distrito de Tayoltita fue de ~10 millones de años, lo que lo identifica como uno de los depósitos epitermales conocidos más longevos en el mundo. Sin embargo, no se aprecia una correlación entre la longevidad de los depósitos y su tamaño. La edad de una toba inalterada del Supergrupo Volcánico Superior que cubre de forma discordante al Complejo Volcánico Inferior de la Sierra Madre Occidental indica que el basculamiento de las rocas y la actividad del paleo-sistema hidrotermal habían cesado en 20.3 Ma. La coincidencia temporal y espacial del volcanismo, el fallamiento, y las mineralizaciones de alta ley puede ser el reflejo de la importancia de las contribuciones de fluidos profundos con componentes magmáticas o aguas meteóricas con un grado elevado de interacción con el substrato. En este sentido, es destacable que el periodo de 0.3 millones de años entre el emplazamiento de las rocas hipabisales y el de las inmediatamente subsiguientes mineralizaciones epitermales es mucho menor que el periodo de ~2 millones de años común en muchos depósitos epitermales (de sulfuración baja e intermedia) en México en que se ha comprobado su asociación con fluidos magmáticos, como en el caso de los depósitos gigantes del distrito de Fresnillo. Tal grado de proximidad temporal entre el emplazamiento de rocas hipabisales y depósitos epitermales era conocida hasta el momento sólo en asociación con depósitos de sulfuración alta.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Tayoltita]]></kwd>
<kwd lng="en"><![CDATA[epithermal]]></kwd>
<kwd lng="en"><![CDATA[low sulfidation]]></kwd>
<kwd lng="en"><![CDATA[Ar/Ar ages]]></kwd>
<kwd lng="en"><![CDATA[timing of mineralization]]></kwd>
<kwd lng="en"><![CDATA[magmatic-hydrothermal cycling]]></kwd>
<kwd lng="en"><![CDATA[Sierra Madre Occidental]]></kwd>
<kwd lng="es"><![CDATA[Tayoltita]]></kwd>
<kwd lng="es"><![CDATA[epitermal]]></kwd>
<kwd lng="es"><![CDATA[baja sulfuración]]></kwd>
<kwd lng="es"><![CDATA[edades Ar/Ar]]></kwd>
<kwd lng="es"><![CDATA[temporalidad de mineralización]]></kwd>
<kwd lng="es"><![CDATA[ciclicidad magmática-hidrotermal]]></kwd>
<kwd lng="es"><![CDATA[Sierra Madre Occidental]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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