Sulfur-Isotope Study of the Ana Yatak Massive Sulfide Deposit,Southeastern Turkey |
| |
| Abstract: | The Ana Yatak massive sulfide deposit is located in the Ergani-Maden District of southeastern Turkey and has been a major source of copper for more than 4,000 years. The mineralization is hosted by strongly chloritized serpentinite, gabbro, diabase, and mud-stone. The ore body is ～600 × 250 m in maximum dimension, mainly consists of pyrite and chalcopyrite, and locally contains abundant magnetite, pyrrhotite, and chromite. The gangue contains predominantly chlorite, rarely quartz. This paper is mainly concerned with an investigation of the sulfur-isotope systematics of the Ana Yatak deposit. Pyrite and chalcopyrite from the ore and pyrite from the host rocks were sampled and analyzed to determine their δ34S composition. δ34S values were found to vary within the range from +4.5 to + 9.3‰ for pyrites (mean δ34S = + 6.5 ± 1.8) and from +4.5 to +10.0 for chalcopyrites (mean δ34S = +6.7 ± 1.9) of the ore, and from +5.8 to +8.8 for pyrites (mean δ34S = + 7.3 ± 1.3) of the host rock. The δ34S compositions of all samples were found to vary from +4.5 to +10.0‰. For the chalcopyrite-pyrite pairs, there is a clear relationship of approximately equal δ34S values at each sampling site. Frequency distribution of the δ34S values is not unimodal and exhibits two peaks. The range of sulfur-isotope systematics implies that the Ana Yatak mineralization was influenced to a greater extent by seawater than by hydrothermal fluids. |
| |
| Keywords: | |
|
|
