Evolution of magmatic sulfide of the giant Jinchuan Ni-Cu deposit, NW China: Insights from chalcophile elements in base metal sulfide minerals

• DOI: 10.1016/j.oregeorev.2023.105497
• Publication Date: 2023-05-20T11:02:14Z
• Authors: Long-Jiao Li; De-Xian Li; Xian-Cheng Mao; Zhan-Kun Liu; Jian-Qing Lai; Zhe Su; Qi-Xing Ai; Yun-Qi Wang
• Keywords: Sulfide Minerals; Pentlandite; Base metal; Layered intrusion

Chalcophile elements differentially distributed among base metal sulfides (BMS) and other discrete minerals are useful for assessing the evolution of magmatic sulfides. The world-class Jinchuan Ni-Cu sulfide deposit is composed western eastern intrusions, but differences in distribution chalcophile BMS between two intrusions have not been well investigated. This study provides new data in-situ platinum-group (PGM) hosted discusses discrepancy melt evolution. variations all compatible (Re, Co, Os, Ir, Ru, Rh) most incompatible (Pt, Ag, Zn, Cd, As, Sn, Sb, Bi) versus whole-rock (Pt + Pd)/(Ir Rh ratios suggest these were fractionated by progressive crystallization melt. Micro-textures PGM suggested that (Ir-Rh-Pt)AsS crystallized almost simultaneously with monosulfide solid solution, Pd-semimetal after loop-textured pentlandite. As same type mineralization, contents intrusion generally higher than those intrusion, which consistent variations. However, chalcopyrite hosts significantly proportions Pd Te comparable amounts micro- nano-particles, indicating diffusion during peritectic reactions was inhibited. In terms negative correlation Metal/S pyrrhotite elemental pentlandite chalcopyrite, it likely attributed to lower sulfur fugacity (fS2) has quantitatively calculated composition. We propose schematic models history melts at Jinchuan, fractional melts, minerals, formation jointly control elements. difference fS2 resulted differential from into