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大巴山构造带属上扬子地台北缘,是在印支期秦岭碰撞造山带南缘前陆的基础上,经历了多期构造叠加所形成一个向南西凸出的弧形构造带。根据构造变形样式及特征组合由北东向南西可依次划分为北大巴山逆冲推覆构造带、南大巴山前陆褶皱—冲断带以及四川盆地东北部低缓构造区。基于野外观察及实测地质剖面对南大巴山构造特征及成因分析进行探讨,指出北东—南西向挤压应力与多层滑脱层是控制南大巴山前陆构造形成的主要因素。
The Dabashan tectonic belt belongs to the northern margin of the upper Yangtze platform. Based on the foreland of the southern margin of the Qinling collision during the Indosinian Period, the Dabashan tectonic belt underwent a multi-period tectonic superimposition to form an arc-shaped structural belt protruding toward the southwest. According to the tectonic deformation patterns and the combination of features, they can be divided into North Dabashan thrust nappe structure belt, South Dabashan foreland fold-thrust belt and low easter tectonic belt in the northeastern Sichuan Basin. Based on field observations and measured geologic profiles, the tectonic characteristics and genetic analysis of Mt. Nadu are discussed. It is pointed out that the NE-NS compressional stress and multi-skidding are the main factors that control the formation of the southern Daba Mountains foreland.