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Title:: Characteristics of Cataclastic Lithofacies in Sareke Glutenite-type Cu Mining Area of Xinjiang, China

Author(s):: HAN Wen-hua; FANG Wei-xuan; ZHANG Gui-shan; LU Jia; WANG Lei; JIA Run-xing; LI Tian-cheng; 1. School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China; 2. China Non-ferrous Metals Resource Geological Survey, Beijing 100012, China; 3. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

Keywords:: Cu deposit; fault; cataclastic lithofacies; macroscopic characteristic; microscopic characteristic; fissure; density; permeability

Abstract:: Sereke glutenite-type Cu deposit in Xinjiang is controlled by Mesozoic intracontinental pull-apart basin in Serekebayi. The orebodies are mainly hosted in Upper Jurassic Kuzigongsu Formation alteration and conglomerate. Because of the strong alteration at the later stage, the cataclastic lithofacies has significant controlling on Sereke glutenite-type Cu deposit. The cataclastic lithofacies forms in the process of basin reformation, and has the strong coupling between fissure and basin fluid. Cataclastic lithification-fissure structure is the migration channel and reservoir structure of the superposition mineralization of deep-source thermal fluid. The macroscopic characteristics of cataclastic lithofacies are mainly consequent cracked fissure zone+shear cracked fissure zone+cataclastic lithification+bituminization+net vein copper sulfide. The types of microscopic fissures are mainly the fissure inside gravel, the fissure around gravel and the fissure across gravel; the fissures are filled with chlorite, chalcocite, asphaltenes, quartz and iron carbonate. The densities of fissures increase from the ancient stratum to nowadays. The fissure permeability and gas logging permeability show that the fissure permeabilities of Upper Jurassic Kuzigongsu Formation ore-bearing strata are higher than the others, and the fissures provide migration pathway and storage space for ore-forming fluid in basin.