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兰州黄河Ⅱ和Ⅲ级阶地的地层结构、年龄及环境意义

, PP. 553-563

Keywords: 地层结构,河流阶地,环境变化,光释光年龄,兰州

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Abstract:

通过对兰州段黄河Ⅱ和Ⅲ级阶地剖面的地层岩性、粒度分析和光释光测年等,认为剖面中被普遍界定为河漫滩沉积的一套厚几米至几十米具水平层理的细粒砂土层是以冲、洪积与黄土互层的交互式沉积,其开始沉积的时期与气候进入冰期或冰阶相对应。据此可将兰州段黄河阶地剖面地层划分为三部分,即:河流砂砾石层、加积层与风成黄土层,分析了这一地层结构的发育过程,指出沉积相的识别和划分对于阶地研究具有重要意义。

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