Geochemical characteristics of platinum group elements and Re Os isotope of the Lengshuiqing Cu-Ni sulfide deposit in western Sichuan Province and implications for mineralization

The platinum group elements (PGE) and Re Os isotopic geochemistry of copper nickel sulfides ores from the Lengshuiqing deposit is studied using ICP MS method The total PGE contents (Sigma PGE) of the Lengshuiqing ores are quite low, ranging from 7 91 x 10(-9) to 56 9 x 10(-9) The Cu/Pd ratios (9460 similar to 318040) of the ores are much higher than that of primitive mantle, indicating that their parental magma might have undergone sulfide segregation at an early stage of crystallization The Pd/Ir ratios (2 57 similar to 112) of the ores have a relatively narrow range, consistent with magmatic genesis of the deposit Both (Os-187/Os-188) and gamma(O8)(t) values are quite variable, ranging from 0 1758 to 0 3620 and +44 0 to +197, respectively, suggesting that abundant crustal material was mixed with the Cu-Ni sulfide ore system during magma ascent and the ore-forming processes