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The Zn-Pb-Cu(-Ag±Au) San Martin deposit in northwestern Zacatecas is one of the most economically important and biggest skarns in Mexico. Mineral associations in this deposit belong to the sulfide skarn type (with rather “classical” prograde and retrograde zones) and contain peripheral subepithermal to epithermal veins. Re-Os ages were obtained for two molybdenite samples from deep Cu-Zn-Pb±Mo±Bi±Ag retrograde mineralization in these deposits, of 43.7 ± 0.3 and 44.0 ± 0.2 Ma, which correspond essentially to the same age. These are 1 to 3 Myr younger than preexisting K-Ar ages for the granitic stock that generated these mineral deposits. Prograde mineral associations are hereby interpreted to have been directly associated with this intrusion. Therefore, we may calculate a simple decrease rate in temperatures of hydrothermal fluids between ~100o and > 300 oC per million years from prograde to retrograde skarn associations. Subepithermal and epithermal veins, however, remain undated.

Geochronology of Mexican mineral deposits. I: the San Martín polymetallic skarn, Zacatecas