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云南中部是元古界昆阳群的集中分布区。区内经常发现因民组及因民角砾岩穿插在昆阳群其他各组中的异常现象。在元江至金沙江北岸的某些构造带内,此种实例也屡见不鲜。已往将这些现象分别视为沉积夹层及火成胶结角砾岩。随着地质工作的不断深入,将此现象作为一种底辟构造看待。本文据大量的野外观察、分析及鉴定资料,描述其特征,同时结合笔者等多年来对有关地层层序及区域构造的研究探讨其形成机理。
Central Yunnan is a concentrated distribution of the Proterozoic Kunyang group. Often found in the area due to the People’s Congregation and breccia interspersed in the other groups of Kunyang anomalies. In some tectonic zones along the northern coast of the Jinsha River to the Jinsha River, such examples are not uncommon. These phenomena have been considered as sedimentary interlayers and pyroclastics, respectively, in the past. With the deepening of geological work, this phenomenon is viewed as a diapir structure. In this paper, a large number of field observations, analysis and identification of information, describing its characteristics, combined with the author for many years on the stratigraphic sequence and regional structure of the study to explore its formation mechanism.