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Research on geochemical process of Te-Au elements in Guilaizhuang gold deposit of western Shandong

YU XueFeng;LI DaPeng;LI ZengSheng;WEI PengFei;Rana.N.S.Sodhi;Shandong Institute of Geological Sciences, Shandong Key Laboratory of Geological Processes and Resource Utilization in Metallic Minerals, Key Laboratory of Gold Mineralization Processes and Resources Utilization subordinated to the Ministry of Land and Resources;Surface Interface Ontario, Department of Chemical Engineering & Applied Chemistry, University of Toronto;  
Guilaizhuang gold orefield is a very important gold orefield found in western Shandong. The deposits distributed in this orefield occur mainly in the Yanshanian meta-alkalescence volcanic complex and are characterized by rich tellurides. The Te-Au ore-forming mechanism is often ambiguous and raises wide concerns. This work chose Guilaizhuang gold orefield as the research object with a focus on an analysis of tellurides characteristics and Te-Au ore-forming mechanism. The geochemical behavior of tellurium elements was systematically studied in the process of mineralization by various means such as the time of flight-secondary ion probe, electron microprobe, and whole rock analysis of trace and rare earth elements. Researches show that under the condition of medium or low temperature, Te tends to replace S, and Te is dispersed in the sulfide crystal lattice in the form of isomorphism whereas under the condition of high Te fugacity, Te tends to form telluride with Au, Ag,Cu, Pb and takes part in mineralization. This seems to be the major geochemical behavior for Te element to participate in mineralization.
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