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地质通报  2007 

印度-亚洲大陆碰撞的时限

, PP. 1240-1244

Keywords: 印度-亚洲大陆碰撞青藏高原巨大的不整合林子宗火山岩同碰撞花岗岩

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Abstract:

印度-亚洲大陆碰撞的起始时间是国际地学界争论的热点,至今尚无一致的认识,从主张晚白垩世(约70Ma)到主张始新世/渐新世之交(约34Ma)等各种观点都有。根据主碰撞带中具同碰撞性质的林子宗火山岩(40.84~64.47Ma)、南冈底斯花岗岩(47~52.5Ma,峰值50Ma左右)、白云母型强过铝花岗岩(56~50Ma),以及沉积学和地层学的综合证据,特别是横贯整个冈底斯带延伸达1500km的巨大区域性角度不整合的时间(约65Ma),认为印度-亚洲大陆开始碰撞的时间在西藏为65Ma左右,完成碰撞的时间在40/45Ma左右。

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