【摘要】 新疆塔里木盆地库鲁克塔格地区奥陶纪曾普遍发育碳酸盐岩台地沉积,但其沉积环境较动荡,碳酸盐岩组合类型为泥晶砂屑、生物碎屑和破碎鲕粒.为系统的研究本区奥陶纪碳酸盐岩的发育演化规模.从碳酸盐岩的组合类型及微观特征分析入手,对其岩石学特征进行分析得出:①碳酸盐岩中鲕粒和生物碎屑经过搬运再沉积,不是原地鲕滩和生物滩的产物;②陆源碎屑岩与碳酸盐岩混合、互层沉积.碳酸盐岩厚度向上逐渐变薄,陆源碎屑岩的厚度逐渐变厚;③碳酸盐岩沉积环境中发育有重力流沉积.证明了奥陶纪碳酸盐岩台地沉积环境是不稳定的.更多还原

【Abstract】 Carbonate platform sediments have been widely developed in the Ordovician in the Kuruketage region of the Tarim basin but because of the turbulence environment the types of carbonate are mainly micritic intraclast and bioclasts and breaking oolites.As part of a systemic study on the development and evolution of carbonates in this district,this study analyzes the carbonate assembled types and microfeatures and makes the following conclusions regarding the lithological characteristics: ① the oolites and bic lasts in carbonates which were deposited after transportation were not the outcome of the original ooidal and biltic shoal.② The carbonate and terrigenous fragmentary rocks were mixed and the interbedded deposition from the bottom to the top shows the thickness of carbonates is thinner while the terrigenous sediment is thicker.③ Gravity current sediments were found in the carbonate deposition environment.These conclusions show that the depositional environment of carbonate platform in the Ordovician was unstable.更多还原