نوع مقاله : مقاله پژوهشی
نویسندگان
گروه زمینشناسی دانشگاه سیستان و بلوچستان، زاهدان، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Safedsang, south of Zahedan, lies at the boundary between the Zahedan granitoid and Eocene flysch. Host‑rock alterations and geochemistry of Sb‑Au siliceous veins were studied via field work, microscopy, isocon (immobile Al₂O₃), and statistics. Alterations include ferruginization, carbonatization, silicification, argillic, propylitic, phyllic, potassic, and albitic; argillic and ferruginization are most widespread, carbonatization most restricted. In potassic zone, K₂O, MgO, Fe₂O₃, Cu, Zn, and Sb are enriched. In albitic, Na₂O and SiO₂ increase whereas K₂O and CaO decrease. Phyllic shows increasing Fe₂O₃, CaO, Sb and decreasing Na₂O, K₂O, MgO. Argillic shows alkali depletion and SiO₂‑K₂O enrichment. Veins yield high Sb (avg 30337, max 244468 ppm), Au (avg 0.627, max 3.16 ppm), Ag (avg 15.95), and As (avg 824 ppm). Au‑As correlation is 0.876. Two groups (hydrothermal vs. host‑rock) were distinguished. The alteration sequence is consistent with porphyry‑epithermal models, confirming high exploration potential.
کلیدواژهها [English]
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