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地质学报  2008 

长江中游水成沉积与风成沉积磁组构特征

, PP. 857-863

Keywords: 长江中游,水成沉积,风成沉积,磁组构,沉积环境

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Abstract:

为了建立长江中游不同成因的沉积物磁组构识别标志，讨论磁组构参数与沉积环境之间的关系，对采自长江中游风成沉积与现代不同沉积环境下的水成沉积物进行了磁组构参数测试和对比。结果表明：①风成沉积的？κ、Ｐ、Ｆ、Ｌ？值均明显低于水成沉积的相应值，但？q？值却比水成沉积的偏大，反映风成沉积物的分选较水成沉积物的要差;②在磁组构参数？FL？关系图上,风成沉积数据点多集中于坐标原点附近,指示沉积动力相对比较弱的沉积环境，而水成沉积数据点却主要分布于？F？轴附近，反映水成沉积物的？F？较？L？发育；③风成沉积的磁化率最大主轴偏角的方向比较分散，但总体方向仍与形成风尘砂的风向一致，并且长轴的倾角较大（22°～24°），短轴的倾角较小（45°～51°），而水成沉积的磁化率最大主轴偏角的方向比较稳定，指示了来水方向，并且长轴的倾角一般小于10°，短轴的倾角大于80°；④风成沉积的？T？值介于-1~1之间，而水成沉积的？T？值却主要以大于1的为主。上述特点可作为长江中游风成与水成沉积物的识别标志。

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