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地质学报  2006 

西藏北部新生代大型逆冲推覆构造与唐古拉山的隆起

, PP. 1118-1130

Keywords: 青藏高原,唐古拉山,新生代,逆冲推覆构造,前陆盆地

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Abstract:

西藏北部唐古拉山地区新生代发育一大型逆冲推覆构造,推覆构造带走向与唐古拉山脉延伸方向一致,主体呈NW-SE向展布,由北部乌兰乌拉湖―巴庆构造带(锋带)、雀莫错―改纳构造带(中带)和南部各拉丹东―鄂碎玛构造带(根带)构成,构造样式上由根带到锋带表现为:高角度叠瓦逆冲构造、褶皱―逆冲构造和中低角度叠瓦逆冲构造,逆冲推覆运动方向由南西向北东,并在推覆构造带北侧发育新生代沱沱河前陆盆地。同构造岩浆侵入体同位素年代学和前陆盆地沉积充填序列演化表明,推覆构造形成时限为67.1~23.8Ma。推覆构造形成演化受控于印度―欧亚板块碰撞造山和其后印度板块持续向北俯冲动力学体制,并造成唐古拉山地区地壳在始新世―渐新世的强烈缩短、增厚和唐古拉山脉的隆起。

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