LI Yun-Gang1, ZHU Chuan-Wei2*
(1. No.3 Geology Mineral Resources Exploration and Development Co.LTD of Inner Mongolia, Huhehaote 010050, China;
2. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China)
Abstract: In this study, EPMA and LA-ICP-MS techniques were employed to investigate the temporal and spatial variations of major and trace elements in a zoned sphalerite from the Huize deposit. The results show that early stage sphalerite (dark color) is Cd-rich and Fe-poor sphalerite; by contrast, late stage sphalerite (light color) is Cd-poor and Fe-rich sphalerite. Cd in sphalerite mainly enters into lattice of sphalerite in the form of direct substitution of Zn, and does not require synergistic Fe to incorporate into sphalerite lattice. Ge and Cu show very similar distribution signatures in zoned sphalerite, suggesting that Ge and Cu substitute Zn into sphalerite as (3Zn2+ ？ Ge4++2Cu+). In and Ga have similar distribution characteristics in the mapping figures, suggesting that In and Ga synergistically incorporate into sphalerite, such as 3Zn2+ ？ Ga3++In3+. Meanwhile, In and Ga are enriched in dark sphalerite, suggesting that they are easier to be incorporated into late stage sphalerite. Meanwhile, the contents of Tl, Se and Mn are sharply increased at the boundaries between different colored sphalerite, suggesting that these elements maybe sensitive to the variations of chemical compositions of ore-forming fluid.
Keywords: sphalerite; dispersed elements; LA-ICP-MS mapping; occurrence state; Huize lead-zinc deposit
ACTA MINERALOGICA SINICA Vol. 40, No.6, 2020, page 765-771
