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通过对滇西北中甸地区 1∶5万地质填图 ,并结合地质构造综合研究 ,首次提出下三叠统布伦组与下伏上古生界为变异性不整合的新看法 .它是在大陆引张环境下形成的一种地层接触关系 .主要识别标志是 :区域性强烈起伏的不整合面 ;下伏基盘伸展构造和引张环境玄武岩的发育 ;上覆沉积厚度显著变化、相变急剧 ;不整合表现形式多样 ,以及“基质” +“岩块”的图面效应 .它的识别对地质填图、地质构造演化以及构造运动的时空转化形式等方面的研究具有重要意义
Based on the 1: 50000 geologic mapping of Zhongdian area in northwestern Yunnan Province and the comprehensive study of geological structure, this paper for the first time put forward a new view that the Lower Triassic Bulan Formation and the underlying Upper Paleozoic are unconformity of variation. A stratigraphic contact relationship formed under the lead-up environment, with the main identification signs being: unconformity with strong regional ups and downs, underlying tectonic extension and development of lead basalts, significant changes in overlying sedimentary thickness, ; The various forms of unconformity and the graphic effect of “matrix” and “rock block.” Its identification is of great significance for geological mapping, geological tectonic evolution, and temporal and spatial transformation of tectonic movement