雅砻江锦屏水电站地区褶皱分期及其对岩石地层的影响研究

THE STAGES OF THE FOLDS AND ITS EFFECT ON LITHOSTRATIGRAPHY IN THE JINPING HYDROPOWER STATION REGION OF THE YALONG RIVER

根据褶皱构造的分类、分期原则,首次将雅砻江锦屏水电站地区褶皱划分为3期:第1期为印支造山期主褶皱;第2期为印支期后层内流变褶皱,第3期为燕山期—喜山期叠加褶皱。这3期褶皱在类型、规模和特征上各具特色,晚期褶皱对早期褶皱还存在叠加关系,从而对本区构造格局的形成以及地层岩石的展布、形态和厚度变化等方面起着直接的控制作用。印支期主褶皱在宏观上控制了坝区地层岩石的总体分布,第二期和第三期褶皱造成坝区岩层厚度、形态、岩性组合的明显变化。

According to the classification and stage principles of folds, we divided the folds into three stages. The first periodic folds: the prime folds of the Indosinian orogenic cycle; the second periodic folds: the intrafolial theomorphic folds of Post Indosinian; the third periodic folds: the superpesed folds of Himalayan to Yanshanian. These three periodic folds have themselves characteristics and types and scale, the differences among them are eminent. The later fold superposed on the primary so that they con...