HE Fang1,2, ZHANG Qian1, LIU Yu-ping1, YE Lin1, MIAO Ying-li3, WANG Da-peng1,SU Hang3, BAO Tan1,2, WANG Xiao-juan1,2
(1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Science, Guiyang 550180, China;
2. University of Chinese Academy of Science, Beijing 100049, China;
3. Hualian mineral exploration limited liability company, Qujing 655000, China)
Abstract: Dulong Sn-Zn Polymetallic Deposit, located in the county of Maguan, Yunnan Province, China, is the third largest Sn deposit in China. This paper briefly generalizes the metal mineralization zonation which behaviors both in horizontal and vertical directions as well as the typical character of the skarn deposit. Lead isotope compositions of mineral, feldspar, marble, schist and gneiss are analyzed, combined with the previous obtained Pb isotope compositions. Results show that lead isotope compositions of ore minerals have concentrated distribution with a uniform shallow source region, consistent with the lead isotope compositions of feldspar of magma, otherwise, they deviate from gneiss lead isotope compositions, indicating that Pb of the deposit mainly come from Laojunshan granite; schist and marble with scattered distribution deviate significantly from the ore minerals, suggesting that schist and marble nearly have no contribution to the lead source of the deposit. Combined with published diagenesis-mineralization age and S-C-O isotope compositions, we think that the deposit has a close relation with Laojunshan granite and belongs to skarn deposit.
Keywords: lead isotope; ore-forming metal sources; Dulong Sn-Zn polymetallic deposit
Email: zhangqian@vip.gyig.ac.cn
ACTA MINERALOGICA SINICA Vol. 35, No. 3, 2015, Page 309-317
