| 川北秦岭地区震旦-寒武纪岩相古地理研究新认识 |
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| 引用本文： | 胡方杰,张殿伟,田海芹.川北秦岭地区震旦-寒武纪岩相古地理研究新认识[J].沉积学报,2014,32(1):1-7. |
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| 作者姓名： | 胡方杰 张殿伟 田海芹 |
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| 摘 要： | 前人研究多认为四川盆地北缘及秦岭地区震旦纪-寒武纪为深海斜坡或台地边缘斜坡，而在该区古地理编图过程中发现，本区碳质泥岩、石煤为地表或近岸浅水滞留环境如沼泽、澙湖的沉积产物，非深水或深海环境的沉积产物。为此，通过对川北野外剖面精细观察和实测、钻井资料深刻分析和对比，并结合地震剖面的解释和控制，对研究区进行了综合剖面相分析、剖面对比相分析及平面剖面相分析；同时参考前人有关该区的构造层序古地理、定量古地理和生产古地理编图资料，通过优化编制震旦纪-寒武纪以世或段（期）为单元的古地理图，认为四川盆地北缘秦岭地区震旦纪-寒武纪的古地理格局主要由潮坪、澙湖、泥碳沼泽、滨岸、局限台地等相带或古地理单元所构成，而非深海盆地、斜坡或台地边缘斜坡。
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| 关 键 词： | 四川盆地北缘 秦岭 震旦- 寒武纪 古地理 潮坪白云岩 沼泽澙湖 |
New Views on the Lithofacies Palaeogeography of Northern Sichuan Basin and Qinling Area during the Sinian-Cambrian |
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| Abstract: | Most previous studies suggest that the lithofacies palaeogeography of northern Sichuan Basin and Qinling area is the deep-sea slopes or slopes of platform margin during the Sinian-Cambrian. However, in the process of paleogeographic mapping in this area, it was discovered that the Carbonaceous mudstone and the stone coal are deposited in the surface water or near shore shallow water, such as swamps and lagoons, rather than in the deep water or the deep sea. Therefore, based on the detailed observation , the measurement of outcrop profiles and the profound analysis of the well datas, and combined with the interpretation ofseismic profiles in the northern Sichuan Basin, the comprehensive analysisof the single section facies, cross section facies and facies mapping were made; meanwhile, by referring to the tectonic palaeogeography, quantitative palaeogeography and production palaeogeography in the area, the paleogeographic maps were drew optimally from the Sinian to Cambrian.It was concluded that the palaeogeographic framework in the area of northern Sichuan Basin to Qinling area mainly consists of tidal flats, lagoons, peat swamps, shores and restricted platform facies, rather than the facies of the deep-sea basin, slopes or margin slopes of platform during the Sinian-Cambrian. |
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