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地理科学  2009 

兰州盆地黄河800kaB.P.阶地的发现及其古地磁年代

, PP. 278-282

Keywords: 兰州盆地,黄河阶地,800ka B.P.,古地磁年代,发现

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Abstract:

兰州东盆地的枣树沟黄河第四级阶地(T4),砾石层顶高出黄河河面84m,其上堆积厚约64m的风成黄土,黄土地层中包括八层古土壤,最底部发育了古土壤S8。光释光(OSL)测年结果显示古土壤S1上部的年龄为70.4±7.6ka。黄土古土壤对比以及磁性地层学研究表明,枣树沟T4上覆风成黄土的年龄为865ka,T4至少形成于865kaB.P.。

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