Study on Sedimentary System and Models for Tataertage Formation(Lower Silurian) in Tarim Basin
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摘要: 通过对塔里木盆地众多野外剖面详细观测及钻井岩心的详细观察，研究区下志留统塔塔埃尔塔格组主要沉积一套以砂、泥岩为主的碎屑岩，根据岩性特征、生物标志和地球物理特征，将塔里木盆地塔塔埃尔塔格组划分为滨岸和陆棚沉积体系，滨岸沉积体系进一步划分为无障壁海岸和有障壁潮坪沉积，陆棚沉积体系以浅水陆棚沉积为特征，并就各微相的岩石类型、粒度分布和沉积构造特征进行了详细的研究。在此基础上，分析了塔塔埃尔塔格沉积期的平面展布特征，总体格局为南北向分带，东西向展布为特征。同时建立了塔里木盆地塔塔埃尔塔格组滨岸、潮坪和滨岸－潮坪的沉积模式，在研究区以滨岸－潮坪的沉积模式为主。Abstract: By studying the sections and cores of Tarim basin, the Tataertage Formation of lower Silurian in Tarim Basin primarily deposited a set of clastic rock composed of sandstone and mudstone. The authors divided Tataertage Formation into onshore sedimentary system and continental shelf sedimentary system by its lithologic, ethologic and geographic character. And the onshore sedimentary system could be further divided into nonbarrier coast sediment and barrier wadd sediment. Its shallow shelf sediment features the continental shelf sedimentary system. The authors also studied the types of rock, grains size distribution and sedimentary tectonic character of these sedimentary facies of Tataertage Formation mentioned above. Based on these studies, the authors analyzed the plane distribution character of Tataertage Formation during sedimentation. The direction of its strike is approximate by south to north, layers distribute nearly parallel from west to east as a whole. The authors established the onshore, wadd, onshorewadd sedimentary model of Tataertage Formation in Tarim Basin, which is primary onshorewadd sedimentary model.
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Key words:
- Tarim Basin /
- Lower Silurian /
- Tataertage Formation /
- sedimentary system /
- sedimentary models
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