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本文论述了在滇西南沧源、镇康、永德一带发现的下三叠统。沧源一带含火山碎屑岩、含放射虫硅质岩之碎屑岩,为早三叠世印度期的沉积,镇康、永德一带之碳酸盐岩为早三叠世奥仑尼克期的沉积。沧源一带有古生物依据的上二叠统碳酸盐岩(厚约325.20m),与上覆下三叠统印度阶怕拍组关系不明,但确整合覆于下二叠统之上。镇康、永德一带尚缺乏古生物依据的碳酸盐岩(厚约492.60m),与上覆下三叠统奥仑尼克阶、下伏下二叠统呈整合接触,有包含下三叠统印度阶及上二叠统(长兴阶、乐平阶)的可能。上述早三叠世沉积的发现,及其与下伏二叠系呈整合接触关系的查明,表明区内并无晚华力西期及印支早期构造运动发生。
This article discusses the Lower Triassic found in the Cangyuan, Zhenkang and Yongde areas, southwestern Yunnan. The Cangyuan area contains volcaniclastic rocks and clastic rocks containing radiolarian chert, which were deposited during the Early Triassic Indian period. The carbonate rocks in the Zhenkang and Yongde areas are characterized by the Early Triassic Ao Nylonian period Deposition. The Upper Permian carbonate rocks (ca. 325.20 m) with paleontology in Cangyuan are not known to be associated with the overlying Triassic Indian order. However, they are indeed superimposed on the Lower Permian. The carbonate rocks (about 492.60 m in thickness) lacking paleontology in the areas of Zhenkang and Yongde are in conformity with the underlying Lower Triassic Aulenic and the underlying Lower Permian, and include the Lower Triassic Indian order and Upper Permian (Changxing, Leping order) may be. The discovery of the above-mentioned Early Triassic sediments and their integrated contact with the underlying Permian suggest that there was no tectonic movement in the late Waxian and Early Indosinian.