摘要:
鄂尔多斯盆地是印支运动使中国大陆处于板内构造体制之后,座落于华北克拉通西部的侏罗-白垩纪盆地,并存在4个阶段的世代演替,其中第一世代是聚煤盆地。它是在中国东部左旋剪切与西部右旋剪切派生的挤压构造应力作用下形成的,但在西侧构造活动带的前渊位置缺乏大型砾质扇,这种憎况显然是由于鄂尔多斯西缘掩冲带前缘存在的隐伏冲断脊,阻碍了粗粒碎屑流向盆地注入,因而在广阔的泛滥平原上形成了优质厚煤层。
关键词:
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机制
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含煤建造
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盆地
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构造环境
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沉积模式
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鄂尔多斯
Abstract:
As a Jurassic-Cretaceous nonmarine basin under interplate tectonic regime since the Indosinian movement at the end of Triassic in age,the Ordos Basin boundaried by a large active thrust belt onto the west Ordos margin is situated in the west part of the North Chick Craton. Its formative mechanism is commonly influenced by the sinistral sheared stress derived from the relative motion between the Eastern Asia continental and Kula-Pacific ocean plates on the east, and by the dextral sheared stress derived from the tectono-accretion onto the south Asia continental margin of the Tethys terranes, such as the Qiangtang and Lhasa Blocks, and Songpan-garze Complex, on the west as well.
The evidence firnished by detailed stratigraphic, sedimentologic and subsidence analyses shows' with fully satisfactory that 4 generations have existed as a successive evolution of the Ordos Basin. Of which, the first generation is so-called Ordos Coal-forming Basin.A blind thrust-ridge depositional model is proposed in this paper to explaine the lack of potential gravel fan deposystem in the west Ordos foredeep, and the occurence of good-quality, thick coal seams origined from the peat-forming swamp on the flood plain between major channelbelts.
百度学术
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