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中国沙漠  2015 

毛乌素沙地西南缘灌丛沙丘沉积物的粒度和元素特征

DOI: 10.7522/j.issn.1000-694X.2014.00058

Keywords: 灌丛沙丘,丘间地,跃移运动,淋溶迁移,沉积环境

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Abstract:

对毛乌素沙地白刺(Nitrariatangutorum)灌丛沙丘沉积物粒度和元素特征进行了采样分析.结果表明:灌丛沙丘沉积物来源单一,几乎全部由丘间地物质组成,其粒度和元素特征与丘间地物质极其相似;相对而言,灌丛沙丘沉积物比丘间地物质含有更多粗颗粒物,主要因丘间地可做跃移运动的中沙和细沙更易被灌丛阻挡而堆积;灌丛沙丘沉积物中大部分元素含量比丘间地物质低,主要因这些元素易被淋溶迁移到丘间地富集;灌丛沙丘发育以来,虽然其沉积环境存在波动,但相对稳定,未发生过显著变化.

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