古特提斯昌宁－孟连带的海域性质和规模历来存在争议和分歧。一些研究者认为，昌宁—孟连带存在一个古生代大洋，有一套完整的洋盆沉积序列（腊垒群，Ｄ－Ｐ）。另外一些研究者则认为昌宁—孟连带是一个陆间裂谷，等等。通过对本区三套硅质岩系（腊垒群、南皮河群、拉巴群）的岩石学、古生物学及地球化学研究认为：拉巴群和南皮河群无疑是大陆边缘沉积，而腊垒群为砂岩、泥岩和硅质的互层沉积，在硅质岩沉积中见由放射虫化石组成粒序层和侵蚀现象，缺乏潜穴或生物扰动。硅质岩的地球化学特征是：Ｆｅ２Ｏ３＜ＦｅＯ，Ｆｅ＝１６７００×１０－６～１７１００×１０－６，Ｍｎ＝１２０×１０－６～２９０×１０－６，Ｃｏ＝９×１０－６～１５×１０－６，Ｎｉ＝１７×１０－６～２４×１０－６，Ｚｎ＝２７．７×１０－６～１２１×１０－６，ＭｎＯ／ＴｉＯ＝０．１～０．２９，δＣｅ＝０．９９６～１．３４５，δＣｅ（页岩）＝１．０２～１．３９，δＥｕ＝０．５３～０．６７，δＥｕ＝０．３～１．０４，ＲＥＥ页岩标准化模式曲线近水平，球粒陨石标准化模式曲线明显向右倾。以上特征表明腊垒群形成于较闭塞的浅海大陆边缘深陆棚至斜坡环境，而非洋盆沉积，不能代表一个古生代大洋 Gout Teoti Changning - Meng maritime nature and scale has always been controversial and divergent. Some researchers think that there is a Paleozoic ocean in Changning-Menglian with a complete set of ocean basin sediments (Labyrinth, D-P). Other researchers think Changning-Menglian is a land rift, and so on. Based on the petrology, paleobiology and geochemistry of the three sets of siliceous rocks in the area (Laomei, Nanpiahe, Labaqun), it is concluded that the Laba Group and the Nanpihe Group are undoubtedly the sediments of the continental margin, The group is interbedded sedimentary sandstone, mudstone and siliceous. In the sedimentary siliceous rocks, the grain-level sequence and erosion caused by radiolarian fossils are observed, and there is a lack of potential points or bioturbation. The geochemical characteristics of the cherts are: Fe2O3