JIA Run-xing1, FANG Wei-xuan1, HU Lei-lei2, LIU De-lei3, LI Shu-guo1, CHEN Teng1
（1. China Non-ferrous Metals Resource Geological Survey, Beijing 100012, China;
2. College of Earth Science and Resources, Chang’an University, Xi’an 710054, China;
3. College of Geology and Mineral Exploration engineering, Xinjiang University, Urumqi 830049, China）
Abstract: In the Sareke basin, there is a large copper deposit hosted in Upper Jurassic glutenite and a coal mine hosted in Lower-Middle Jurassic strata. In copper orebody, chalcocite, calcite and secondary quartz usually show occurrence of veinlet or stockwork filled in the interval among the different kinds of gravel consisted of quartzite, mudstone, carbonatite, and so on. In addition, the orebody near fault usually contains higher contents of asphalt. In this paper, we choose chalcocite and secondary quartz separated from copper ore for sulfur, lead, hydrogen and oxygen isotope analysis in order to judge the ore-forming material source of Sareke copper deposit. The δ34S of chalcocite from copper ore ranges from -19.1‰ to -13.2‰; The ratio of 206Pb/204Pb ranges from 16.699 to18.417;the ratio of 207Pb/204Pb ranges from 15.294 to15.684, and the ratio of 208Pb/204Pb ranges from 36.909 to 38.996. The δ18Oand δD of the fluid inclusion in secondary quartz range from 17.9‰ to 20.6‰ and from -82.6‰ to -52.4‰, respectively. The δ13C of coal mine in the Kangsu Formation of Lower Jurassic strata ranges from -24.7‰ to -24.3‰, which is similar to the δ13C of asphaltum in copper ore ranging from-20.79‰ to-20.35‰. These isotopic analysis results indicate that sulfur is mainly derived from biological reduction of the strata sulfate; the lead shows the obviously multiple features; the metallogenic fluid of secondary quartz are mainly derived from metamorphic fluid; the asphaltum in copper ore are closely related to the coal-bearing source rocks of Lower-Middle Jurassic strata. According to geological characteristics and the isotope data, we think that the metallogenic process of Sareke copper deposit shows multiphase and multi-stage mineralization during the period from the Upper Jurassic to the Lower Cretaceous.
Keywords: genesis; stable isotope; glutenite type; Sareke copper deposit; Wuqia, Xinjiang
ACTA MINERALOGICA SINICA Vol. 37, No. 5, 2017, Page 630-637
