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Micro-Structural Characteristics of Late Pleistocene Loess and It’s Environmental Meaning in Shangzhou
Author(s): 
Pages: 4-7
Year: Issue:  4
Journal: Journal of Gansu Sciences

Keyword:  黄土—古土壤显微特征古环境晚更新世商州;
Abstract: 以商州二龙山晚更新世以来黄土剖面为例,应用粒度分析和扫描电子显微镜对商州晚更新世黄土的微结构进行分析,探讨了黄土微结构特征与其形成环境的关系.表明粒度<5 um的粘粒级含量在黄土与古土壤中差异最大,S1古土壤达30.39%,而L1黄土仅为24.7%;S1古土壤中大量出现铁质粘粒胶膜并呈流胶状,结构密实;L1黄土粘粒胶结物含量较少,土质疏松.得出了商州晚更新世S1古土壤形成于湿热的森林环境,L1黄土形成于凉偏湿的草原环境,S0黑垆土形成于湿温的气候环境.
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