of different coal ranks were collected from the underground working faces in the Yueliangtian coalfield (coal seams No.8 and No.10), the Songhe coalfield (coal seams No.12 and No.15) and the Jinjia coalfield (coal seams No.7 and No.18) in the Panguan syncline, western Guizhou, China....
Not all deposits necessarily require δ34S∑S > 0‰, for example, Panguna, which shows a constant low SO42−/H2S over a wide temperature range (Eastoe, 1983). Again, several S isotope studies of calc-alkaline magmas agree with this, for example tephra and scoria from Mt Mazama ...