A geochemical study of gersdorffite from the Trepça Mineral Belt, Vardar Zone, Kosovo

[摘要] This work presents a textural and chemical study of gersdorffite from numerous small occurrences of hydrothermalPb–Zn+(Ni–As–Sb) mineralization from Trepça Mineral Belt (broad area of Stan Terg and Kizhnica–Hajvalia–Badovcore field) hosted in hydrothermally altered serpentinites (listvenites). Mineral associations, textural relations and substitutional trends of gersdorffite recognized in Kizhnica, Mazhiq, Melenica, Vllahia and Selac are discussed based onmicroscopy and microprobe studies. The two types of paragenetic sequence with nickel mineralization are distinguishedin studied localities: Ni–Fe–Co sulfides → Ni sulfarsenides and sulfantimonides (in Kizhnica–Badovc and Melenica)and Ni sulfarsenides → Ni–Fe arsenide and diarsenide → ± Ni sulfides (Vllahia and Selac). Various substitution trendsin studied GUS are detected: Fe+Co/Ni (all localities, except Selac); As/Sb – gersdorffite–ullmannite series (Kizhnica,Mazhiq, Vllahia VLX) and As+Sb/S (Selac and Vllahia VL4). Based on As/S ratio, two different hydrothermal fluidswere distinguished: narrow range and low As/S values (Kizhnica, Mazhiq, Melenica, Vllahia VLX), which suggestdecreased As activity, mixing in the proximity of deposition site (Kizhnica, Mazhiq), broad range and high As/S values:increased As activity and disequilibrium crystallization (Selac, Vllahia VL4).

[学科分类] 自动化工程

[关键词] gersdorffite solid solution;geochemistry;listvenite;Trepça Mineral Belt;Kosovo