Resources and environmental effects of abnormal enrichment of dispersed elements: research situation and tendency
GU Xue-xiang~(1,2), WANG Qian~2, FU Shao-hong~2, TANG Ju-xing~2 (1.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China; 2.College of Earth Sciences, Chengdu University of Technology, China)
Dispersed elements, including Cd, Ga, In, Tl, Ge, Se, Te and Re, are traditionally considered to be impossible to form independent ore deposits. However, the discovery of a number of independent ore deposits of dispersed elements in western China in the recent years has broken this traditional cognition. Based on the analysis of current research situation and existing problems in the study of dispersed element deposits, the authors of this paper propose that the tectonic evolution and associated crust-mantle (replacement), fluid activity, and geochemical fractionation processes of the western margin of the Yangtze block have controlled the principal styles of mineralization and distribution framework of dispersed element deposits. Future research on the mechanism of abnormal enrichment of dispersed elements and its resources and environmental effects should be focused on three main aspects, i.e., the metallogenic geodynamics of enrichment districts of dispersed elements, the generality and discrepancy in mineralization of dispersed (elements) and chemical dynamics of their intergrowth and/or separation with other mineralizing elements, and the geochemical behaviors of dispersed elements during supergene circulation and their constraints on (ecological) and environmental systems.