The Upper Permian strata in Qujiang-Renhua area, Guangdeng Province, is a coalbearing sequence. Based on sedimentary faeies analysis and corelation of chemical variation in sedimentary rocks, the following regularitie...The Upper Permian strata in Qujiang-Renhua area, Guangdeng Province, is a coalbearing sequence. Based on sedimentary faeies analysis and corelation of chemical variation in sedimentary rocks, the following regularities can be notieed: (1) The evolution of continental facies→transitional facies→marine facies is reflected by the deereasing tendency of K, Ga, Ti and the inerease in Mg, Ca, and Sr; (2) K, Ga, and Ti exhibit a tendency of decrease and Ca, Mg, V, and Sr tend to increase in the sequence of lacustrine faeies→laterlal facies→gulf and lagoonal facies. (3) Lacustrine facies→lagoonal facies→gulf facies is paralled by decrease in K, Cu, Pb, V, and Ba as well as an increase in Ca, Mg and Mn in sideritie redules. (4) Discussions arc also made in the paper on the differences between drill core samples and surface samples, between pyrite, siderite and ealc-siliceous nodules, and between light and heavy minerals separated from sandstone in respect bo their components (Tables 2, 3, 4, 5).展开更多
文摘The Upper Permian strata in Qujiang-Renhua area, Guangdeng Province, is a coalbearing sequence. Based on sedimentary faeies analysis and corelation of chemical variation in sedimentary rocks, the following regularities can be notieed: (1) The evolution of continental facies→transitional facies→marine facies is reflected by the deereasing tendency of K, Ga, Ti and the inerease in Mg, Ca, and Sr; (2) K, Ga, and Ti exhibit a tendency of decrease and Ca, Mg, V, and Sr tend to increase in the sequence of lacustrine faeies→laterlal facies→gulf and lagoonal facies. (3) Lacustrine facies→lagoonal facies→gulf facies is paralled by decrease in K, Cu, Pb, V, and Ba as well as an increase in Ca, Mg and Mn in sideritie redules. (4) Discussions arc also made in the paper on the differences between drill core samples and surface samples, between pyrite, siderite and ealc-siliceous nodules, and between light and heavy minerals separated from sandstone in respect bo their components (Tables 2, 3, 4, 5).