滇西二叠系拉巴组中的拉巴灰岩的成因长期以来曾引起广泛争议。对拉巴灰岩的产状、结构构造及碳酸盐微相特征的研究表明 ,拉巴灰岩最初形成于浅水碳酸盐台地 ,由于突发的地质事件 ,被搬运至深水 ,半深水环境中沉积下来。拉巴灰岩的出现 ,证明在二叠纪 ,昌宁—孟连洋盆与相邻的陆棚之间 ,有陡峻的陆棚边棱存在。 The origin of the Lago limestone in the Permian Laba Formation in western Yunnan has long been a cause for widespread controversy. Studies on the shape, structure and carbonate microfacies of the Labat limestone suggest that the Labam limestone was originally formed on shallow carbonate platforms and was transported to deep and semi-deep water environments due to unexpected geological events Down. The emergence of the Labat limestone proved that there is a steep shelf edge between the Permian, the Changning-Menglian ocean basin and the adjacent shelf.