ZHANG Yu-han1, HU Yu-zhao1,2, REN Tao1,2*, DONG Chuan-qi1, HE An-bei1, LIU Chang-wei1, FENG Yong3
(1. Kunming University of Science and Technology, Kunming 650093, China;
2. Yunnan Mineral Resources Laboratary, Kunming 650093, China;
3. Xinjiang nonferrous metal industry Co., Ltd, Aletai 836399, China)
Abstract: Huayuan sandstone copper deposit in Wuqia County, the Xinjiang Uygur Autonomous Region, China is located in the Kashi Sedimentary Basin, west margin of the Tarim Basin. In this study, we have performed the phase analysis of copper todiscuss the ore type, scanning electron microscope with ore microscope to research on mineral characteristics of atacamite and cuprite. The mineral characteristics are discussed fully and summarized in detail here. Ore is highly oxidized in Huayuan sandstone copper deposit with the main mineral, Cuprite. Atacamite in Huayuan copper deposit occurs as coarse granular aggregations, vein or veinlet in fine sandstone. The color of single crystal for cuprite is nearly black and aggregate color is purple. The average weight percent of Cu in atacamite is 55.7%, and the weight percent of Cl is 19.1%.So the mass ratio of Cu to Cl is nearly to 3. While the weight content of Cu is 87.7% in cuprite. Atacamite could form through reaction of malachite and chlorine-bearing aqueous solution in drought and high temperature environment.
Keywords: copper mineral; atacamite; phase analysis; sandstone copper deposit
E-mail: rtao1982@126.com
ACTA MINERALOGICA SINICA Vol. 37, No. 5, 2017, Page 625-629
