龙门山北段宝珠寺飞来峰的特征及形成演化

Characteristics and formation evolution of klippe in Baozhu Temple of north section of Longmen Mountain

龙门山飞来峰主要有挤压推覆和重力滑覆两种形成观点,飞来峰的成因对龙门山的构造演化具有重要意义。通过对其北段宝珠寺飞来峰野外实地考察及其构造变形特征的研究,得出该飞来峰主体为向斜构造,具有多层结构,由北西—南东向逆冲推覆形成,为推覆说提供了有力的证据;并且该区域构造具有典型的后展式逆冲推覆构造,区别于整个龙门山前展式推覆构造模式。

There were two views on the formation of the klippe in Longmen Mountain ; they were mainly compressive nappe and gravity gliding. The study of the klippe origin was of significance for the tectonic evolution of Longmen Mountain. Through field investigation and the study on the tectonic deformation characteristics of the klippe in Baozhu Temple, the authors concluded that the main structure was a syncline with multi-layer structure and the formation of the klippe was thrust nappe from north west to south east, which provided powerful evidence for the nappe theory ; and the regional structure had the characteristic of typical overstep propagation thrust nappe structure, which was different from the main mode of the thrust nappe of forestep propagation type in Longmen Mountain.