The Study Of Trace Elements Geochemistry In Late Permian Coal And Tuff Samples From East And South Sichuan Province, China

In this thesis, the enrichment and occurrence modes of trace element associated (or accompany)with the Late Permian coal from Sichuan province were studied by using of coal petrology,mineralogy and geochemistry; the relationship between trace elements, minerals in coal and theirinfluences, such as depositional environment, terrigenous supply area, volcanic ash, hydrothermal,were discussed; The result shows that:(1) The dominant sediment-source regions for the coal androof strata of the Huayingshan Coalfield is not the Kangdian Upland but the Dabashan Uplift, theHannan Upland, and the Leshan–Longnvsi Uplift, which surrounded the coal basin during peataccumulation.(2) The partings in the Huayingshan Coalfield appear to have been derived fromvolcanic ash of alkali rhyolites.(3) The highly-elevated concentrations of high field-strength elmentsin the coals are due to hydrothermalfluids.(4) The roof sample of C19coal seam from Shipingcoalfield is identified as a high-Ti alkali basaltic tuff.(5) All tuffs in the studied area are matrix tuff.In the meantime, the recovery of enriched rare metallic elements was preliminary assessed.