临河凹陷QK3钻孔220 ka以来的沉积环境演变记录
Science Technology and Engineering(2021)
Abstract
临河凹陷是河套盆地的一部分,黄河由西向东流经,其内发育了巨厚的沉积地层,是第四纪环境演变的理想场所.通过分析临河凹陷中QK3钻孔地层的粒度特征,结合年代地层重建了研究区中更新世晚期以来的沉积环境演变过程:189.9 ka.BP~220.26 ka.BP表现为滨湖相沉积;117.47 ka.BP~189.9 ka.BP表现为河流边滩沉积;117.47 ka.BP~189.9 ka.BP表现为河流边滩沉积;38.5 ka.BP~117.47 ka.BP表现为河流边滩和河漫湖泊的交替沉积环境;13.49 ka.BP~38.5 ka.BP表现为河流边滩相沉积环境;13.49 ka.BP以来表现为河漫湖泊相沉积环境.
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