Temporal-spatial distribution of heavy metals and nonlinear geochemical response of the mining history.

Abstract：Human activities, especially mining acitivities, have great impact on the living environment of the human beings, thus making it very urgent to study the environment around mining areas and especially the pollution of heavy metals. The prime problem is the transport ability and impact factors of heavey metals, namely, the geochemical temporal-spatial response of heavy metals from pollution sources to their surrounding areas and related temporal-spatial structure in the final analysis. Many famous mineral deposits in China such as the Tongling and Tonglushan deposits have a long mining history and are seriously polluted by heavy metals discharged due to long-continued mining, which has brought many environmental problems while producing great benefits for the national economy. Presently, the study of the mine environment has mostly focused on undynamic and investigative aspects and the mechanism of geochemical migration and transformation is seldom considered in the contexts of both the temporal and spatial structure. The information about the mine environment in China is also meager. The authors suggest that the nonlinear means should be used in the study of the environmental geochemistry of heavy metal in mining areas, with the focus on the analytical methods such as the fractal, multifractal and nonlinear time-series methods to study the mechanisms of time sequence and spatial distributions of heavey metals.