Sedimentary systems and Coal-accumlation Characters of Dissecting Datong Basin
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摘要: 根据板块构造理论分析，祁连山侏罗纪众多小型盆地的原型为走滑拉分盆地，这些盆地在早、中侏罗世普遍经历了两次拉分裂陷作用，大通盆地即为其中之一。本文分析了大通盆地的沉积体系和演化阶段，结果表明，聚煤作用主要与盆缘断裂和粗碎屑沉积相关，小型湿地扇为重要聚煤场所，构成盆地的富煤区。大通盆地的形成、演化及聚煤特征在祁连山侏罗纪煤盆地中有一定的代表性。Abstract: From the theory of plate tectonics, the prototype of Qilianshan small basin Jurassic is defined as pull-apart basin, and they had undergone two time rifting during Early-Mid Jurassic. The Paper takes Datong basin for example, dissects its sedimentary system, evolutinary stages and coal-accumlation. The results show that coal-formation is related to basin boundary fault and megaclast sedimentation, with small humid fan being important coal-accumlating setting, and becoming high-coal districts in the basin. Datong basin is a representative to Qilianshan small coal basin Jurassic
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Key words:
- pull-apart basin /
- sedimentary system /
- evolutinary stages /
- coal-accumltion /
- Datong
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[1] .李思田主编. 断陷盆地分析与煤聚积规律. 北京: 地质出版社, 1988 [2] .Pitman W C, And rews J A. Subsidence and thermal history of small pull-part basin. Soc. Econ. Paleontol., Mineral Spec. Publ., 1985, 37, 45～49 [3] .Flores R M. Rocky mountain tertiary coal-basin model and their applicability to some World basin. Int, I Coal Geol. 1989, 12: 767～798 [4] .王强. 民和盆地侏罗纪含煤地层沉积环境. 煤田地质与勘探. 1994, 22(6): 5～8 -
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