Epithermal Gold Occurrences in the Lakes District of the Main Ethiopian Rift and Tendaho (Afar rift): Discovery of a metallogenic province (Contributo in atti di convegno)

Type
Label
  • Epithermal Gold Occurrences in the Lakes District of the Main Ethiopian Rift and Tendaho (Afar rift): Discovery of a metallogenic province (Contributo in atti di convegno) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Fiori, M., Pretti, S., Solomon, T., Valera, P. (2008)
    Epithermal Gold Occurrences in the Lakes District of the Main Ethiopian Rift and Tendaho (Afar rift): Discovery of a metallogenic province
    in 33rd IGC-International Geological Congress-Symposium "MRD-09 Au-Ag telluride-selenide deposits, Oslo, 6-14 August
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Fiori, M., Pretti, S., Solomon, T., Valera, P. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • Il Congresso si è tenuto ad Oslo dal 6 al 14 agosto 2008. Il lavoro è stato prodotto su CD-ROM (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • IGAG-CNR, Istituto di Geologia Ambientale e Geoingegneria (literal)
Titolo
  • Epithermal Gold Occurrences in the Lakes District of the Main Ethiopian Rift and Tendaho (Afar rift): Discovery of a metallogenic province (literal)
Abstract
  • Epithermal precious metal mineralization is commonly associated with Cainozoic or Quaternary geothermal systems in areas of calc-alkaline volcanism. Much of this volcanism typically occurs above subduction zones along continental margins and in island arcs as well as along spreading mid-ocean ridges. Less commonly, economic mineralization may be associated with continental rift zones, such as the extensive rift system that cuts through South-Western Asia and continues along the eastern side of Africa. This system already includes sectors that represent evolving oceanic basins (the Gulf of Aden and the Red Sea), but mostly it comprises sub-aerial intracratonic rifts, including the Ethiopian Rift Valley. Sub-aerial volcanism in the Ethiopian Rift Valley has caused hydrothermal activity, which is still active in several sites being investigated for geothermal energy. Extinct geothermal fields are also quite common. The possibility that these geothermal systems, related to the continental rifting, have been and may be ore-forming systems cannot be discarded a priori. Epithermal gold occurrences related to Quaternary volcanics are being intensively studied for their precious metal potential. Adularia-sericite-type occurrences have been found. Analyses of 579 core and cutting samples collected from exploratory geothermal concerning a number of localities (Gedemsa, Aluto and Corbetti calderas, and the Tendaho graben) were analyzed for gold. The results showed gold concentrations of 100 to 440 ppb. Values between 200 and 300 ppb are common. The overall characteristics of these occurrences related with epithermal processes induced by the Quaternary central volcanoes within the Main Ethiopian Rift (MER), seem to delineate an individual metallogenic province, unusual for the present Ethiopian metallogenic scenery. A new field of investigation is probably emerging. A study of these phenomena, in the light of recent acquisitions in metallogenic knowledge, could be of interest both for further scientific studies and for new possibilities in mining activity. (literal)
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