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地质论评  2004 

一种特殊的地貌现象――碟形洼地群及其成因的探索

Keywords: 地貌碟形洼地群陨石雨冲击坑数字地形模拟DTM河北平原

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Abstract:

使用1926年出版的五万分之一顺直地形图作历史地貌分析,在河北平原西部白洋淀流域地区发现有数量众多、形态奇特的地貌――碟形洼地。用计算机数字地形模拟(DTM)方法对该洼地的个体形态和总体分布特征进行研究,并与国内外其他地区已报道的陨石雨冲击坑对照,判断白洋淀流域的碟形洼地群可能是分布在第四纪松散沉积物上的陨石冲击坑的遗迹。推测冲击可能发生在全新世中―晚期,洼地群是一次规模巨大的陨石雨冲击所形成的。

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