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Rezumat articol ediţie STUDIA UNIVERSITATIS BABEĹž-BOLYAI
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Rezumat: The Roşia Montană area belongs to the Transilvanides geotectonic unit (Săndulescu, 1984, Balintoni, 1997). This area is located in the northern part of the so-called Golden Quadrangle from South Apuseni Mountains. The mining activity was always very important at Roşia Montană. Recently, the mining archaeological results have proved that the exploitation of gold and silver started before the Roman times (Cauuet et al., 2003).
The Roşia Montană ore deposit was assigned to the low-sulfidation type by Mârza et al. (1997) and Tămaş (2002). Fluid inclusions study (Tămaş & Bailly, 1998, 1999; Tămaş, 2002) confirmed the low salinity (1-7.8 wt.% NaCl equiv.) and the low homogenization temperatures (198-340°C) of the mineralizing fluids from the Roşia Montană ore deposit.
The hydrothermal alterations are well developed in the Roşia Montană ore deposit (Tămaş, 2002). The most striking one is potassium metasomatism (with the formation of adularia). “Sericite” (muscovite) alteration is also widespread in the whole ore deposit. Intermediate and advanced argillic alteration is also occurring as overprint. High-grade ore zones are marked by intense silicification. The carbonate-type alteration is present in very restricted areas.
According to Hedenquist’s (2003) reinterpretation of the epithermal systems classification, the Roşia Montană ore deposit may be assigned to an intermediate sulfidation type. ... |
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