Geology, S-Pb-Os isotopic compositions and Re-Os dating of the Lingdong gold deposit in the eastern Tien Shan

Much more world-class gold deposits, which are the main part of the Asian Gold Belt , have been found along the northern margin folding-thrusting fault zone of southern Tien Shan in the western region of Tien Shan. But few are found along that in the eastern region of Tien Shan. The Lingdong gold deposit with gold grade of 3. 5g/t. is a new-discovered and explorating important deposit along the zone in the eastern region of Tien Shan. The gold orebody occurs as lense hosted in tension-shear faulted crystal tuff of Early Devonian in the Yanxingshan briitle-ductile shear zone. The gold occurrence in ores is intergranule-, included- and nanometre-gold mainly in pyrite and pyrrhotite. Re-Os dating of the gold-bearing pyrite obtains a mineralization age of 306. 0 ±4. 2Ma, which is almost consistent with the collision orogenic age after the closing of the southern Tien Shan Ocean. The gold mineralization might be closely related to the briitle-ductile deformation during the orogenic processes. The ore