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bei jing di qu sha wu zhi de zhong kuang wu cheng fen jie gou te zheng yu feng sha de sha wu zhi lai yuan
Author(s): 
Pages: 27-36
Year: Issue:  1
Journal: Journal of Desert Research

Keyword:  重矿物沙物质河床风成沙北京地区稳定矿物坡积物沙丘沙紫苏辉石堆积物;
Abstract: 北京地区不同类型的风成沙经重矿物成分、特征进行详细分析鉴定表明,与本区河床沙、平原堆积物和坡积物均很相似,与河床沙更为接近.但与区外沙漠沙丘砂的重矿物成分资料对比,差异较大. 研究表明:1)本区河床沙与沙丘沙重矿物含量相对较高;2)本区沙丘沙与河床沙中,辉石,尤其紫辉石含量相对较高;3).本区沙物质中不稳定矿物与较稳定矿物含量高,重矿物磨圆度普遍较差,河床沙与沙丘砂尤为明显;4).本区沙丘沙与河床沙存在着明显的继承关系.故本区风成沙主要来自本区河床沙,风沙的来源区域有限,在治理上应着眼于本区为主.
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