Abstract
The Temascaltepec district is formed by several sets of Ag Au bearing low-sulfidation epithermal veins, including the La Guitarra vein system. The vein stratigraphy of the La Guitarra deposit is defined by three mineralization stages. Samples from all stages were analyzed by quadrupole mass spectrometry (QMS) to quantify the volatiles contained in fluid inclusions. The results show the occurrence of three fluid types in most mineralization stages: magmatic, crustal meteoric, and surficial meteoric fluids, supporting the conclusions from previous fluid inclusion and stable isotope studies. All the analyzed samples display N 2/Ar ratios (0 to 2526) indicating a general mixing between andesitic or rhyolitic and meteoric fluids. The strongest magmatic fluid contributions were found in the metallic associations of the deposit (stages I, IIB and III).
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