关中西部湋水河全新世古洪水平流沉积地层研究STRATIGRAPHY OF HOLOCENE PALAEOFLOOD SLACK-WATER DEPOSITS IN THE THE WEISHUI RIVER VALLEY OF THE WESTERN GUANZHONG BASIN
李晓刚,黄春长,庞奖励,朱美玲,姚平,朱向锋
摘要(Abstract)：
在湋水河谷多个地点发现全新世古洪水平流沉积层赋存于黄土—古土壤剖面中。在杨凌河段的典型地点系统采样,通过磁化率、烧失量、碳酸钙和粒度分析,揭示了古洪水平流沉积物的基本特征,明确了其与风成黄土和古土壤之间的主要区别。通过地层对比、以及对于平流沉积层上下的文化层考古学断代,并且结合与主流漆水河古洪水的时代对比,确定了湋水河谷两期洪水发生在4500—4100aB.P.,相当于龙山文化的晚期,对应我国夏代之前的特大洪水。该研究对于湋水河古洪水水位和流量的恢复有十分重要的意义。
关键词(KeyWords)： 古洪水;平流沉积物;全新世;湋水河;关中盆地;陕西
基金项目(Foundation): 国家自然科学基金项目(No.40771018);; 教育部博士点基金(20050718008)
作者(Author): 李晓刚,黄春长,庞奖励,朱美玲,姚平,朱向锋
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