摘要
中、上奥陶统与下奥陶统之间在塔中低凸起区缺失下奥陶统大湾阶、牯牛潭阶和中奥陶统庙坡阶，为角度不整合接触，在其周围的满加尔凹陷、塔东低凸起及塘古孜巴斯凹陷则为连续过渡沉积；通过地层对比与沉积相分析，认为塔中地区中、晚奥陶世发育孤立碳酸盐台地，台地边缘发育粒屑滩、灰泥丘和骨架礁亚相；塔中地区中、晚奥陶世沉积演化经历了早奥陶世末－中奥陶世中期抬升暴露阶段和中、晚奥陶世（宝塔─临湘早期）孤立碳酸盐台地的发育阶段以及晚奥陶世临湘─五峰期碳酸盐岩和碎屑岩混积台地发育阶段。
Between the Middle-Upper Ordovician and Lower Ordovician in Tazhong low arch area assumes the contact relationship of an angular unconformity for lack of Dawan and Guniutan orders in Lower Ordovician as well as Miaopo order in Middle Ordovician. In its surroundings, Manjiaer sag, Tadong low arch and Tangutsbas sag are succes-sive and transitional sedimentations. The stratigraphic correlation and depositional facies analysis showed that isolated carbonate tableland was developed in Middle-Late Ordovician in Tazhong area, with some subfacies of developed grain bank, lime mud hill and skeletal reef in platform surroundings. The depositional evolution of Middle-Late Ordovician underwent three periods, i.e. the rising outcrop period in late period of Early Ordovician to middle period of Middle Ordovician, the isolated carbonate platform-developed period in Middle-Late Ordovician to middle period of Middle Ordovician and the Peperite platform-developed period of composite carbonate rock and elastic rock in Linxiang-Wufeng stage of Late of Ordovician.
出处
《新疆石油地质》
CAS
CSCD
2000年第3期204-207,共4页
Xinjiang Petroleum Geology
关键词
塔里木盆地
中奥陶世
晚奥陶世
沉积特征
演化
Tarim basin, Middle, Middle Ordovician, Late Ordovician, Sedimentary characteristics, Evolution
