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地球学报  2006 

内蒙古苏尼特左旗中新世晚期孢粉记录干旱事件

DOI: 10.3975/cagsb.2006.03.03

Keywords: 中新世晚期,孢粉,干旱事件,苏尼特左旗,内蒙古

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Abstract:

对中中新统通古尔组和上覆地层宝格达乌拉组的40个孢粉样品的分析表明通古尔期晚期形成环境较早期温湿,在通古尔期向宝格达乌拉期过渡期间,灌木和草本植物花粉由19·7%增加到46%,而乔木植物花粉总数由69·5%下降为34·7%,松蒿比(A/C)由4突降为0·64,标志着干旱事件的开始。将该地区的古地磁、哺乳类化石和孢粉资料与前人研究进行对比,结果显示干旱事件发生在晚中新世约8·5Ma,这一事件在华北具有广泛的可比性。

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