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通过龙永煤田古地理分析表明:童子岩组第三段含煤沉积是在受限制的聚煤凹陷中形成的,成煤作用是复杂和不均一的,含煤岩系形成时的坳陷内部存在构造分异。早二叠世童子岩组早期龙永煤田内为浅海相的沉积环境;中期开始的区域性大海退逐渐形成的滨海、海湾泻湖及近海湖泊、泥炭沼泽等环境,并形成了童子岩组第三段含煤建造;晚期海水由东北向西南退出,古地理环境是由浅海向陆地迁移,从而结束了童子岩组地层的含煤建造,预示东吴运动来临。
Paleogeography analysis of Longyong coalfield shows that the third coal-bearing sedimentary formation of Tongziyan Formation was formed in the restricted coal accumulation depression, and the coal formation is complex and heterogeneous. The interior of the depression There are structural differences. Early Early Permian Tongziyan Formation Longyong coalfield within the shallow marine sedimentary environment; the beginning of the middle of the regional sea retreat gradually formed by the coastal seas, the Gulf lagoon and offshore lakes, peat swamps and other environments, and formed the third In the late stage, the seawater exited from northeast to southwest. The paleogeographic environment migrated from shallow sea to land, ending the coal-bearing formation of the Tongziyan Formation, indicating the advent of Soochow movement.