Magmatic Complex of Guadalcázar, Geochemistry, Emplacement and Mineralization

In the limits between Sierra Madre Oriental and Mesa Central physiographic provinces, in the municipality of Guadalcázar (state of San Luis Potosí, México) have been recognized two granites stocks and other minor granites outcrops riming a central plain of Guadalcázar. These granites have different geochemical and mineralogical patterns, hence are divided in two major types; the most recognizable granite is El Realejo, whose composition is peraluminous, high-K calc-alkaline, rich in FeO(T) and enriched in elements like Rb, Zr, Ta, Y, Yb, and LREE; poor in elements like Mg, Ti, Eu, Ba, Sr and Hf, with relative high values of HREE. Moreover, its modal mineralogy is rich in K-feldspar and quartz with less quantity of sodic plagioclase and biotite. All these features have permitted to describe El Realejo granite as A-type granite with a post-orogenic origin. Whereas El Aguaje de Sánchez granite is less enriched in incompatible elements, its Rb/Sr and Rb/Ba ratios are very low, and its europium anomaly is slightly positive, therefore, El Aguaje de Sánchez granite is classified as high Ba-Sr granite from a post-orogenic setting. Considering the geochemistry of El Realejo granite, its alterations (turmalinization, greisenization, albitization and so on), its mineralogy and its relationship with wall rock, is posible to determinate that the model of ore deposit in El Realejo granite correspond to greisen-skarn with good possibilities to explore for Sn, W, Zn, Ag, Be and Mo

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