LA-ICP-MS In-situ Trace Element Characteristic of Pyrite from Yangzaiyu-Fancha Ore Block in Xiaoqinling Gold Field and Its Indication

Located in the southern margin of the North China Craton, the Xiaoqinling gold field has a proven gold reserve of over 611t. Although most gold deposits have been extensively studied, issues related to the metallogenic geological background and the source of the ore materials remain debated. This paper conduct further studies on the Yangzhaiyu-Fancha S60 vein of sothern-medium ore belt from Xiaoqinling gold field. Three generations of (PyⅠ, PyⅡ, PyⅢ) were identified according to detailed field investigation and microscopic identification. We presents a study of the distribution characteristics of trace elements in gold-bearing pyrite from different generation, The results show that the contents and trace element distribution characteristics of Au, Ag, Te, As, Co, Ni from different generation assum significant difference, the content of pyrite from different generation is lightly lower, and plays an insignificant role in gold mineralization; There is prominently positive correlation relationship between Au and Te in the second generation and the contents of Au, Te are relatively higher, it shows that the second generation is important for gold mineralization and the Te play an important role in transfer enrichment and precipitation of gold. An intimate Te-Au-Ag association has been widely noticed in widespread gold mineralization in Xiaoqinling gold district, and low-As, high-Te in pyrite, suggesting that the ore-forming materials and ore-forming fluids of the gold deposits may have come from the deep magma devolatilization or mantle degassing, the geogical background of the gold deposit mainly due to the destruction of the North China Craton.