【摘要】 阿尔金山及其断裂系统由于在地学研究中的重要意义而受到广泛重视。以板块构造理论、造山带理论为指导,结合前人资料和野外地质考察,厘定了阿尔金山及其断裂系统的构造性质。认为阿尔金山及其断裂系统在三叠纪呈现左行走滑与挤压隆升的构造特征,早—中侏罗世呈现左行走滑与伸展的构造特征,晚侏罗世—白垩纪呈现左行走滑与挤压隆升的构造特征,古新世—始新世呈现右行走滑与伸展的构造特征,渐新世—第四纪呈现左行走滑与挤压隆升的构造特征。值得注意的是,虽然三叠纪和早—中侏罗世阿尔金断裂系统均为左行走滑,但成因机制却存在明显差异。其中三叠纪的左行走滑是挤压应力场作用的结果,而早—中侏罗世的左行走滑却可能主要是伸展应力场作用的结果。更多还原

【Abstract】 The Altun Mountain and its fault systems have widely brought into focus because of its significance in the earth science.Based on the theories of plate tectonics and orogenic belt,the analysis of the former data and field geologic review,the structural features of the Altun Mountain and its fault systems in Mesozoic and Cenozoic are newly determined.It is suggested that the Altun Mountain and its fault systems are characterized by left-lateral strike-slip and squeezing uplift during Triassic,left-lateral strike-slip and stretching during Lower and Middle Jurassic,left-lateral strike-slip and squeezing uplift again during Upper Jurassic and Cretaceous,right-lateral strike-slip and stretching during Paleocene and Eocene,and left-lateral strike-slip and squeezing uplift again during Oligocene and Holocene.It is observed that the Altun fault systems are characteristic of left-lateral strike-slip during Triassic and Lower and Middle Jurassic,but their formation mechanisms are obviously different.The former results from squeezing stress field,while the latter from extending stress field.更多还原