Akademik Veri Yönetim Sistemi
5th Biennial Meeting of the Society-for-Geology-Applied-to-Mineral-Deposits / 10th Quadrennial Symposium of the International-Association-on-the-Genesis-of-Ore-Deposits, London, Kanada, 22 - 25 Ağustos 1999, ss.909-912
The Kaletas gold occurrence is confined to 250-275 m long 1-3 m wide discontinous, silicified lenses within sandy limestones and tuffites enriched in organic matter. These lenses occur along the bedding planes and a fault zone trending parallel to the bedding directions. These were initially major inflow zones for hydrothermal fluids. Silicification occurs as replacement bodies and infills in the secondary pores developed as a result of carbonate dissolution. Gold deposition follows the carbonate removal, Although no gold grains are observed, even under microscope, chemical results reveal significant gold contents of 23.5 ppm. Mineralized samples contain pyrite, marcasite, realgar and orpiment as ore minerals and chalcedony, sericite, illite and organic matter as gangue minerals. A well developed hydrothermal alteration zoning, from an inner silicification through argillic alteration to outer propylitic alteration, may reflect the change in the composition of gold bearing fluids. The association of sericite, illite and dolomite may indicate that gold was transported in slightly acidic to neutral solutions in the form of Au (HS)(2)(-) and was deposited as a result of adsorption on organic matter and/or decrease in S-activity of the solution.