THE PITCHBLENDE AND SULFIDE ORES OF RIO FREDDO-PEVERAGNO (in Italian)
In the first part of this work, the geology and petrology of the Mount Besimauda area (Eastern Maritime Alps) are examined. The investigation includes grounds from the Permian to the middle Trias; examined in detail are the porphyric masses of the Permian and associated tuffs, in which effectively pitchblende ore bodies occur. In ihe second part, the ore is examined. The deposit has an hydrothermal origin, of upper Permian or lower Triassic age; bui the original character is not definitely known, because ihe ore bodies within country rocks were highly metamorphosed. The main metallic minerals are: pitchblende, pyrite, chalcopyrite; the gangue mineral is quartz. Also in the Rio Freddo mine a red alteration has been recognized. This feature is investigated frequently in all the world uraniferous deposits and it is named "hematite alteration"; it has affected both gangue and wall rocks. The "hematite alteration" at Rio Freddo may have been developed also from the alteration of the primary pitchblende ore bodies; the red supergene products such as gummite or uranophane might have impregnated the gangue minerals and country rocks. In the last chapter, after a discussion on the origin of the hydrothermal solutions, this deposit is compared with other already well known deposits and concludes attributing the ore of Rio Freddo to the "siliceous-pyrite-galena" ore type described by Everhart & Wright. (auth)
- Research Organization:
- Comitato Nazionale per le Ricerche Nucleari, Rome
- NSA Number:
- NSA-14-000400
- OSTI ID:
- 4223222
- Journal Information:
- Bollettino della Societa Geologica Italiana (Italy), Journal Name: Bollettino della Societa Geologica Italiana (Italy) Vol. Vol: 63; ISSN BOGIA
- Country of Publication:
- Country unknown/Code not available
- Language:
- Italian
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