Abstract
The diagenetic evolution of gangue and ore minerals of selected F-(Pb-Zn) deposits in the Alpine Triassic of the Alpujarrides, Spain and the San Vicente Zn-Pb Mine, Pucará basin (Upper Triassic-Liassic), central Peru has been isotopically characterized (Sr, C, O, and S).
These ore deposits occur mainly in dolomite horizons deposited within a carbonate platform at the margin of an emerged continent and are associated with a narrow facies span comprising (1) the inner part of the lagoon (with tidal flat facies and evaporite molds), (2) the lagoon sensu stricto, and (3) the barrier facies.
The isotope ratios display similar trends in both districts and can be summarized as follows. (1) No isotope differences between ore samples and host rock are recognized. (2) According to the position in the diagenetic crystallization sequence, systematic differences in the isotope composition are observed. (3) The strontium ratios in the first generations are less radiogenic than those of the last generations. Despite the clear trends observed, the absolute differences between 87Sr/86Sr ratios are always very small and plot close to those assumed for Triassic/ Liassic ocean water. (4) The composition of the stable isotopes of C, O, and S changes in a similar way. With a few exceptions the later generations are slightly depleted in the heavier isotopes compared to the first generations.
A model of relatively early diagenetic ore formation is proposed for the San Vicente Mine. This model is thought to be also applicable, with variations, to other similar ore deposits, including the F-(Pb-Zn) deposits in the Alpujarrides.
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Fontboté, L., Gorzawski, H. (1988). Isotope (Sr, C. O, and S) Tracing of Diagenetic Ore Formation in Carbonate-Hosted Ore Deposits Illustrated on the F-(Pb-Zn) Deposits in the Alpujarrides, Spain and the San Vicente Zn-Pb Mine, Peru. In: Boissonnas, J., Omenetto, P. (eds) Mineral Deposits within the European Community. Special Publication No. 6 of the Society for Geology Applied to Mineral Deposits, vol 6. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-51858-4_25
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