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The Lead and Zinc Ores of the Raibl (Cave del Predil- Northern Italy) Zone: New Metallogenic Data

  • Luciano Brigo
  • Paolo Omenetto
Conference paper
Part of the Schriftenreihe der Erdwissenschaftlichen Kommissionen book series (ERDWISSENSCHAFT, volume 3)

Summary

The ore concentration process at Raibl appears to be in connection with the following paleogeographic and paleotectonic parameters:
  1. a)

    the eastern border of the Valbruna-Raibl W—E- trending Carnian basin (ore-bearing area);

     
  2. b)

    the upper Dolomia Metallifera (host rock);

     
  3. c)

    the “Buchenstein” (lower stratigraphic limit of ore distribution);

     
  4. d)

    the lowermost part of the Calcare del Predil Formation (upper stratigraphic limit of ore distribution);

     
  5. e)

    the N S and NE SW Triassic faults (ore concentration lines).

     
The ore deposition took place essentially by means of epigenetic, per descensum mechanism, in form of internal mechanical and chemical sediments, within a well-defined framework of syntectonic fissures and solution cavities, strictly depending on the geometric pattern of Triassic fault system. Both syngenetic faults and ores underwent the late alpine tectonics effects. Among these, highly significant for mining exploration progress is the NE—trending block faulting, discovered by the writers in the northern sector of the mine.

The positive influence of all the above mentioned paleogeographic and paleotectonic parameters on the lead- zinc concentration process is confirmed, at least to a certain degree, by the first ore exploration results in the Valbruna area.

In this paper we will not deal with the problem of metal source, ascribed to joined Triassic volcanism and Tertiary magmatism by Di Colbertaldo, and to Triassic volcanism by Romagnoli and Zeller. A correct approach to this problem (in reality not essential to the aims of ore exploration in the Raibl region) would be possible only by taking into account the whole “family” of lead, zinc, fluorite and barite Triassic deposits in the Eastern Alps, as well as their “heritage” relationships with the former metallogenic epochs in the same paleogeographic province.

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References

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Copyright information

© Springer-Verlag Wien 1978

Authors and Affiliations

  • Luciano Brigo
    • 1
  • Paolo Omenetto
    • 2
  1. 1.Cattedra di Giacimenti MinerariIstituto di MineralogiaMilanoItalia
  2. 2.Cattedra di Giacimenti MinerariIstituto di Mineralogia e PetrologiaPadovaItalia

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