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Chemical and mineralogical compositions of silicic, mafic, and alkali tonsteins in the late Permian coals from the Songzao Coalfield, Chongqing, Southwest China

Alkali TonsteinsLate Permian CoalsEngineeringCoal BasinGeologyMineral DepositGeochemistrySedimentary PetrologyChemistryGeochronologySedimentologyPetrologySongzao CoalfieldMineral Geochemistry