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西藏的海相第三系最早由海登(Hayden,1916)报导,产于岗巴、定日一带,称为岗巴系。至1979年章炳高等在仲巴县麦拉山口发现海相第三纪化石后,提出第三纪海侵可能越过雅鲁藏布江断裂的推断。此后又在日土县多玛至龙木错一带相继发现有海相第三系地层的分布,岩性主要为粗碎屑沉积,以角度不整合覆于侏罗系或白垩系之上,厚度大于 1200m。多玛地区发育较好,地层出露较全,产丰富的六射珊瑚、腹足类和瓣鳃类等化石,以日土县多玛区欧利和欧拉加姆剖面为代表,并命名为欧利组。
The earliest Tertiary in Tibet was first reported by Hayden (1916) and was produced in Gangba and Tingri areas and is called Gangbang. Until 1979, Zhang Binggao discovered the marine facies Tertiary fossils at the Mylar Pass, Zhongba County, and proposed that the Tertiary transgression might cross the conclusion of the Brahmaputra fault. Later, the distribution of marine marine Tertiary strata was successively discovered in the area of Dama-Longmu fault in Ritto County. The lithology mainly consisted of coarse clastic sediments, unconformity over the Jurassic or Cretaceous, and the thickness Greater than 1200m. The Sodom area is well developed and the strata are more exposed. The fossils such as six-ray coral, gastropods and flap gills are well represented by the Oryu and Olagum sections in the Doma area of Ritra County and are named Ollie group.