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阿尔金断裂中段南侧东西向隆起的形成及对阿尔金山新生代隆升机制的启示

, PP. 1863-1876

Keywords: 青藏高原北缘,阿尔金断裂,阿尔金山,东西向隆起,柴达木盆地

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Abstract:

?阿尔金断裂和阿尔金山位于青藏高原北缘,是青藏高原地质和地理意义上的北界,对研究高原的隆升和变形机制有着重要的意义.尽管阿尔金山的形成与阿尔金断裂的走滑有着不可分割的联系,然而其成因机制至今仍不清楚.本文在对柴达木盆地西北缘三条新生代沉积剖面详细调查的基础上,结合沉积相分析,对发育在阿尔金断裂中段南侧的三个近东西向隆起(自西向东分别为阿哈提、阿拉巴斯套和呼通诺尔)的形成时间进行了详细的厘定.各剖面的地层年龄均由磁性地层或孢粉化石结果来限定,并利用砾石统计结合古水流来判定其物源.研究表明这些呈雁列式展布的近东西向隆起早在约36Ma前就开始形成,并控制了其后柴达木盆地西北缘的沉积.这些隆起标志着阿尔金山的早期隆升,是阿尔金断裂在其发育早期中下地壳韧性剪切的产物.阿尔金断裂在中新世及以后的左旋走滑错断并改造了这些早期隆起,最终形成了阿尔金山的现今菱形格局.

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