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科学通报  2011 

新生代全球变冷背景下北部青藏高原变冷和干旱化事件:西宁盆地早第三纪沉积物中正构烷烃和孢粉的记录

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Keywords: 正构烷烃,西宁盆地,古环境,青藏高原隆升,干旱化

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Abstract:

位于青藏高原西北部的西宁盆地沉积了年代序列跨度非常长的连续的新生代地层.这些地层序列记录了有关青藏高原隆升历史及其相关气候变化的丰富信息.本研究获得了西宁盆地谢家剖面较高分辨率的正构烷烃生物标志化合物和孢粉记录.整合正构烷烃和古孢粉记录揭示在50.2~28.2Ma之间,西宁盆地经历了长期的降温过程,明显的生态事件发生在37.5~32.7Ma之间.自此盆地中的植被呈现显著的垂直地带性变化较低海拔处生长旱生灌草类植物,中海拔地带生长亚热带阔叶树,高海拔带生长针叶林.这些植被和气候的变化有可能是对始新世早期气候最适宜期之后长期的全球降温事件和早新生代北部青藏高原周围山地隆升事件的共同响应.

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