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临夏盆地新生代沉积物高分辨率岩石磁学记录与亚洲内陆干旱化过程及原因

, PP. 989-1000

Keywords: 临夏盆地,岩石磁学,亚洲内陆,干旱化

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Abstract:

亚洲内陆干旱化是全球新生代大陆环境变化中最引人瞩目的重大事件,与新生代全球变冷和青藏高原隆升密切相关。文章通过对甘肃临夏盆地几乎连续的新生代沉积物系统岩石磁学性质研究,获取了高分辨率磁化率和非磁滞剩磁记录,揭示在29.08.6Ma的漫长的以湖相粉砂岩和泥岩为主的渐新世晚期和中新世早、中期没有明显的长期变化,从8.6Ma开始持续增加,尤其从6.4Ma和5.3Ma开始表现出两次快速持续增加。同时,以8.6Ma为界磁性矿物相对含量发生明显变化,此前以赤铁矿为主,磁铁矿和磁赤铁矿次之,此后以磁铁矿和磁赤铁矿为主,赤铁矿次之,磁性矿物类型和性质类似于风成红粘土和黄土。因此,我们将这种沉积物中磁性矿物组合、性质和含量的长期变化解释为流域外风成物质的加入,指示我国西北内陆现代干旱气候可能从8.6Ma开始,7.46.4Ma后急剧加速变干,5.3Ma后再次加速变干,并最终形成今天的干旱区的过程。98Ma开始的青藏高原阶段性快速隆升和随后的全球变冷可能是驱动亚洲内陆干旱化进程的动力。

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