阿尔金断裂带8Ma左右的快速走滑及其地质意义  

Rapid Strike-slip of the Altyn Tagh Fault at 8 Ma and Its Geological Implications

作　　者：陈正乐[1] 万景林[2] 王小凤[1] 陈宣华[1] 潘锦华[3] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]国家地震局地质研究所,北京100029 [3]辽宁国土资源规划院,沈阳110031

出　　处：《地球学报》2002年第4期295-300,共6页Acta Geoscientica Sinica

基　　金：国家自然科学基金青年基金项目 (4 0 10 2 0 2 2 );国家重点基础研究发展规划项目 (2 0 0 1CB40 980 8;2 0 0 1GB7110 0 13 );国土资源部自由探索项目 (B2 3 8)联合资助

摘　　要：阿尔金断裂带的走滑变形历史与青藏高原的抬升、变形密切相关。阿尔金断裂中段旁侧岩体中磷灰石的裂变径迹测试年龄结果集中在 8Ma±。区域资料显示 ,沿阿尔金主断裂带旁侧普遍存在 8Ma±的磷灰石裂变径迹年龄。为此推测 ,阿尔金断裂带在 8Ma±经历了一期快速的走滑变形事件。结合青藏高原抬升、变形研究资料 ,表明 8Ma±是青藏高原抬升。The strike slip history of the Altyn Tagh fault was highly related to the uplift and deformation of the Tibetan plateau. This paper mainly presents fission track dating results of apatite from granites near the fault. The fission track dating yields ages concentrated on the 7～9 Ma, with about 2 Ma difference. Regional data also show that 8 Ma obtained by fission track dating of apatite is widely spread along the fault, suggesting a period of rapid strike slip of the fault during this time. Studies of the uplifting and deformation history of the plateau show that many important events, such as the uplift of the plateau, the formation of the NS trending extensional structures in south Tibet, and the climate changes in Asia, occurred at about 8 Ma. Therefore, the authors suggest that 8 Ma was one of the most important periods for the deformation and evolution of the Tibetan plateau.

关 键 词：阿尔金断裂带 快速走滑 快速抬升 青藏高原 变形 构造事件 

分 类 号：P542.3[天文地球—构造地质学]