对阿尔金断裂科学问题的再认识

据近年内阿尔金断裂研究的进展阐述了应深入解决的4个科学问题及其研究思路:1)阿尔金大型走滑断裂何时发生?变形年代学研究证明阿尔金断裂初始走滑的年龄在89～97 Ma,即从晚中生代-早新生代才开始出现;2)运动学研究包括隆升与走滑两个方面,需要进行大比例尺度的构造研究和变形组构研究,尤其是断裂两盘错距的确定,必须找准被断裂错移的同一构造-岩相带的界线;3)阿尔金断裂的划分意义,它的延伸和规模及对中国西部以及中亚大陆构造格架的影响;4)阿尔金断裂对两侧盆地沉积-构造演化的控制和影响.解决上述4个科学问题,对于重新认识中国西部大陆构造格架、中国西部成矿带的展布及对中国西部找油的战略评估都具有非常重要的意义.

RE-UNDERSTANDING ON SOME ACADEMIC PROBLEMS OF THE ALTUN FAULT

Based on the recent contributions, we emphasized that the following key problems should be firstly solved. (1) When did the strike-slip movement occur in Altun fault? The samples of deformed rocks from Altun fault belt yield a group laser probe 40Ar/39Ar isochronal age of 89～97Ma, which suggests that the strike-slip movement of Altun fault began around Late Mesozoic-Early-Cenozoic. (2) The structural survey and texture studies of deformed rocks on local outcrops are important to reveal the dynamics study of Altun fault. The displacement of the Altun fault can be measured by a displaced tectonic sedimentary face boundary. (3) The eastern extension and scale of Altun fault are also very important to study its influence not only on the western China tectonics but also on the Middle Asia continental tectonics. (4) The Altun strike-slip fault controlled and influenced the evolution of the basins in the both sides. What mentioned above will help us to do the further detailed study on the Altun strike slip fault, and has very important significance for re-understanding the continental tectonics, deposit belt distributions and oil explorations in western China.