鄂尔多斯盆地叠合演化及构造对成煤作用的控制

发布时间：2018-04-10 22:37

本文选题：鄂尔多斯盆地 + 煤炭资源　；参考：《地学前缘》2017年02期

【摘要】：鄂尔多斯盆地是多期成煤盆地叠合改造形成的构造盆地。石炭纪、二叠纪、三叠纪和侏罗纪成煤盆地的沉积演化过程具有一定差异,但煤炭资源形成的时空规律具有高度相似性。大地构造背景转换过程控制聚煤期,石炭纪、二叠纪含煤岩系形成于加里东—海西构造运动转换过程,三叠纪和侏罗纪含煤岩系形成于印支—燕山转换过程。沉积作用转换区域控制成煤区,在近海型盆地中,成煤区位于向陆一侧的河-海沉积作用转换区域。在内陆湖泊型盆地中,成煤区位于围绕湖心呈环带状分布的河-湖沉积作用转换区域。燕山及以后的构造运动控制了含煤岩系的形变方式和煤炭资源赋存状态。鄂尔多斯成煤盆地后期改造的显著特点是西部逆冲,东部隆起,南部和北部隆升和断陷共生。盆地西缘发育近南北向逆冲推覆构造,导致侏罗纪含煤岩系大面积剥蚀,造成石炭纪、二叠纪含煤岩系剥蚀、重复、褶皱和断裂。东部发生大面积隆起,石炭纪、二叠纪和侏罗纪含煤岩系遭受大范围剥蚀。盆地内部形成向北西缓倾的斜坡和南北向延伸的向斜,使晚古生代、三叠纪、侏罗纪煤炭资源得到保存。南部和北部边缘相继发生先抬升后断陷,形成了银川—河套断陷和汾渭断陷,构成了鄂尔多斯盆地含煤岩系的南北边界。构造背景和沉积作用转换是控制煤炭资源形成的重要地质条件,在大地构造运动界面上覆岩系中,寻找沉积体系转换区域是战略性找煤的有效途径。
[Abstract]:Erdos basin is a multi period coal basin superposed tectonic basin. Carboniferous, Permian, Triassic and Jurassic sedimentary basin evolution of the coal has a certain difference, but the regularity of coal resources in the formation of a high degree of similarity. The tectonic background of the conversion process control of coal accumulation period, Carboniferous, Permian coal bearing formation system in the Caledonian Hercynian tectonic movement in the conversion process, coal containing Triassic and Jurassic system formed in Indosinian Yanshan conversion process. Depositional conversion into regional control in coal area, offshore basin, coal forming area is located on the landward side of the river and sea depositional conversion area. In Inland Lakes basin, coal forming around the lake area is located in the river is the zonal distribution of ring lake depositional conversion area. Tectonic movement in Yanshan and beyond control of the coal bearing strata deformation mode and coal occurrence. Ordos significant characteristics of coal basin reformation is thrust uplift of the eastern, western, southern and northern uplift and rifting basin development. Symbiotic South-North thrust nappe to reverse, resulting Jurassic coal bearing strata denudation caused by large area, Carboniferous, Permian coal bearing strata denudation, repetition, fold and the fracture occurred in eastern area. The Carboniferous coal bearing strata, uplift, Permian and Jurassic system suffered extensive erosion. The basin formed north west dipping slopes and extends north syncline, the late Paleozoic Triassic, Jurassic coal resources are preserved. The southern and Northern edges have occurred after the first faulted uplift and the formation of the Yinchuan Hetao rift and Fenwei rift, constitute the coal bearing strata Ordos basin of the north south border. Tectonic setting and sedimentary transform is of great importance to controlling geological conditions of coal resources in the formation, tectonic In the overlying strata on the movement interface, it is an effective way to seek the strategic coal prospecting by finding the transition region of the depositional system.

【作者单位】：西安科技大学地质与环境学院;陕西省地质调查院;
【基金】：国家自然科学基金项目(41402308)
【分类号】：P618.11

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