N.V. SHATOVA, V.V. SHATOV, A.V. MOLCHANOV, O.V. PETROV, A.V. TEREKHOV, V.N. BELOVA, V.I. LEONT’EV (VSEGEI)

Geochemistry and petrography of hydrothermally altered rocks of the Ryabinovoe ore field (South Yakutia) as the basis for prediction of gold-copper-porphyry ore mineralization

Results of predictive assessment of gold-copper-porphyry mineralization based on combine approach to studying and mapping petrographic and geochemical characteristics of hydrothermally altered rocks within the Ryabinovoe ore field are discussed. It was established that emplacement and subsequent evolution of the Rybinovy alkaline stock were accompanied by the formation of hydrothermal-metasomatic zonation of plutonogenic type. The zonation is represented by haloes of aegirine feldspathitic and gumbeitic alteration within inner parts of the stock and by haloes of skarnification, fenitic and propylitic alteration in near-intrusion space. Main petrochemical and geochemical characteristics (specialization) of both wallrock metasomatite and weakly/moderately hydrothermally altered rock are recognized. It was indicated that gumbeitic alteration haloes in combination with positive multiplicative geochemical anomalies of AuAgCuBi, BaMoPb and AsSbHg composition could be used as main criteria for the prediction of gold-copper-porphyry ore mineralization within the Ryabinovoe ore field. The article provides recommendations on geological exploration within the located prospects.
Keywords: geochemistry and petrography of hydrothermally altered rocks, prediction of gold-copper-porphyry ore mineralization, the Ryabinovoe ore field, South Yakutia.