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-  2014 

河漫滩相沉积与风成沉积粒度判别函数的建立及在红土中应用

DOI: 10.11821/dlyj201410006

Keywords: 第四纪红土,粒度特征,判别分析

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Abstract:

摘要: 以长江南通段、婺江金华段的河漫滩沉积物和洛川、新疆昭苏的马兰黄土为训练样本,推导出河漫滩相沉积与风成沉积粒度的Fisher判别函数,并用启东河漫滩沉积物、南京下蜀黄土和伊犁马兰黄土对判别函数进行验证。第四纪红土的判别结果显示:新余、南平等地红土具有典型河漫滩沉积特征;长沙、金华、南昌、九江等地红土即具有风成又具有河漫滩沉积的特征,且风成沉积特征随着纬度减小及地形起伏增加而减小。结合现代降尘的粒度组成推测,中亚热带网纹红土的物质来源有近源也有远源。近源组分为来自附近河漫滩泛滥平原沉积物的风力二次搬运,在沉积后依旧保留了河漫滩沉积的大部分粒度特征;远源组分可能与黄土类似,由冬季风从北方物源区搬运而来。

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