西昆仑库斯拉甫一带侏罗纪断陷盆地演化及成煤环境分析
Evolution and Coal-forming Environment Analysis of Jurassic Rift Basin in Kusilafu Area, Western Kunlun
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摘要: 西昆仑库斯拉甫一带侏罗纪断陷盆地呈近南北向展布，受控于西侧的区域性大断裂——库斯拉甫断裂。盆地中煤层主要产于侏罗系叶尔羌群杨叶组（J2y）和莎里塔什组（J1s），表现出层位多、单层厚度较薄且延伸不稳定的特征。淡水介壳滩、硅化木堆积层也在多个层位出现，显示有成煤植物的异地埋藏堆积特点，成煤沉积环境为河湖相和河湖沼泽相。晚印支造山运动后的伸展拉伸构造活动可能为该区域侏罗纪断陷含煤盆地的形成提供了动力。Abstract: Rift basin is expanded with nearly N-S trending in Kusilafu area of Western Kunlun, which is controlled by regional Kusilafu Fault in the west. The coal of this rift basin is mainly produced in Yangye Formation and Shalitashi Formation of Jurassic Yeerqiang Group, showing the characteristics of multiple layers, thin layer and unstable elongation. Freshwater shelly beach and petrified wood stacked layers are also appeared in multiple layers, which show accumulation characteristics of coal plant's different burial places. Coal-forming environment belongs to thecontinental sedimentary environment of lacustrine and fluvial swamp. The stretching tectonic activity in Late Indo-China orogeny may be offer the impetus for the forming of coal-bearing rift basin nearby Kusilafu area.
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Key words:
- Western Kunlun /
- Kusilafu /
- Jurassic /
- rift basin /
- coal-forming environment
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