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中文摘要：
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F-L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。
英文摘要：
In order to establish the identification of different causes of formation of sediment magnetic fabric character and discuss the relation between sediments fabric parameters and sediment environment, the aeolian sediment in the middle reaches of the Yangtze River and the aqueous sediment in different modern deposit environment are tested and compared. The results show that, firstly, the values on κ, P, F,L of aeolian sediment are obviously smaller than the corresponding values of aqueous sediment except q which is larger in aqueous sediment, which reflects that sorting ability of aeolian sediment is worse than that of aqueous sediment. Secondly, in the figure of F-L relation of magnetic fabric, the data of aeolian sediment are mostly concentrated in the vicinity of the coordinate origin, which indicates that sedimentary dynamic is relatively weaker. While the data of aqueous sediment are mostly distributed in the direction of F axis, which reflects that F is dominant compared with L of aqueous sediment. Thirdly, the declination direction of susceptibility maximum axis of aeolian sediment is relatively dispersing, however, the overall direction is still consistent with the wind direction forming the aeolian sand, moreover, the inclination of long axis is lager （22°-24°）and the inclination of short axis is smaller（45°-51°）. While the declination direction of susceptibility maximum axis within the aqueous sediment is comparatively stable, which can indicate the direction of water flowing, and the inclination of long axis is general smaller than 10 and the inclination of short axis is larger than 80 . Finally, T value of aeolian sediment is distributed between -1 and 1, but most T value of aqueous sediment is larger than 1. Those characters mentioned above can be used as the identification of aqueous sediment and aeolian sediment in the middle reaches of Yangtze River.
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