WANG Yan-li1,2, ZHU Xin-you2,3, PENG Qi-ming4, FU Qi-bin5, LI Shun-ting2, CHENG Xi-yin3
1. China University of Geosciences(Beijing), Beijing 100083, China;
2. Beijing Institute of Geology for Mineral Resources, Beijing 100012, China;
3. Sinotech Minerals Exploration Co., Ltd., Beijing 100012, China;
4. Ministry of Land and Resources of the People's Republic of China, Beijing 100812, China;
5. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
Abstract: In addition to the greisens and early granite inclusions, special dark inclusions were found in the alkali feldspar granite of the Yaogangxian deposit. Compositions of these dark inclusions are very complex, containing albite, K-feldspar, quartz, muscovite, tourmaline, chlorite, marcasite, pyrrhotite and some other sulfides such as chalcopyrite, sphalerite, and galena. After studying mineralogical and geochemical characteristics of the dark inclusions, host alkali feldspar granite and mafic enclaves, we concluded that the dark inclusions are metasomatic alteration products of the mafic enclaves and their geochemical characteristics were strongly affected by the host granites. Meanwhile, significant amounts of marcasite and chlorite in the dark inclusions indicated the evolution environment of the later period Yaogangxian magmatic fluids is a lower temperature and lower salinity environment.
Keywords: dark inclusion femic enclave geochemistry Yaogangxian tungsten deposit
