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地质学报  2007 

青藏高原渐新世晚期隆升的地质证据

, PP. 577-587

Keywords: 中新世早期湖相沉积,孢粉组合,古植被,青藏高原隆升

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Abstract:

国内外学者普遍认为,地壳缩短增厚是青藏高原隆升的主要原因,青藏高原隆升对环境变迁和东亚季风具有重要影响,但对青藏高原隆升时代存在不同认识。通过统计分析青藏高原中段新生代不同时期的地层倾角,表明区域褶皱变形主要发生于古近纪,中新世湖相沉积地层产状平缓,挤压构造变形微弱,说明地壳缩短增厚主要发生于中新世前。湖相沉积地层的孢粉分析结果表明,青藏地区热带亚热带阔叶林植被自始新世中期开始逐步减少,至中新世早期濒临消亡;暗针叶林植被自渐新世早中期开始逐步增加,至中新世早中期达到繁盛程度甚至居主导地位。根据这些地质证据,结合全球气候变化、古气温及年代学资料,综合推断青藏高原渐新世晚期隆升高度达到海拔4000m左右。

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