Abstract
The Emei mande plume activity lasted for a long period of time ranging from the whole Late Paleozoic to Mesozoic. The large-scale Emeishan basalt eruption marked the summit period of mafic magmatic activity between Early and Late Permian. Lots of Au, As, Hg, Sb and other trace elements, in the form of extreme dispersion, found their way into coal seams of the Longtan Formation in the transitional zone between platform facies and slope facies at the margin of the platform around the areas of Xingyi, Anlong, Xingren and Zhenfeng in southwestern Guizhou Province. During the Yanshanian Emei mantle plume activity, large amounts of ore-forming elements such as As, Au, Hg, Sb, etc. were extracted from the Emeishan basalt and coal seams by hydrothermal solutions, followed by their mobilization and transport. When the hydrothermal solutions passed through the coal measures of the Longtan Formation, the element As was enriched locally to form high-As coal.
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