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为了建立江汉平原沉积物示踪的磁学模型,对汇入江汉平原的主要河流现代沉积物磁学特征进行了研究,结果表明:(1)在江汉平原范围内,无论长江、汉江,还是周边的漳河、沮水、玛瑙河和清江,它们的现代沉积物的磁学参数特征均显示出明显的差异,而且和源区表壳岩性也显示出极好的相关性;(2)长江和汉江现代沉积物中铁磁性矿物均以亚铁磁性矿物为主,它们主导了样品的磁性特征,但长江沉积物比汉江沉积物亚铁磁性矿物含量高;(3)长江和汉江沉积物的亚铁磁性矿物晶粒都以假单畴-多畴为主,并且长江沉积物磁性颗粒总体上要比汉江的粗;(4)在汇入江汉平原的主要支流中,汉江的亚铁磁性矿物含量远远高于其他支流,且磁性矿物的晶粒也比其他支流的粗;(5)除汉江以外的支流中,玛瑙河沉积物中磁性矿物的晶粒比较细且不完全反铁磁性矿物含量较高,漳河中的超顺磁物质含量较高,而清江中不完全反铁磁性矿物含量较高且磁性矿物的晶粒相对较粗.上述结果表明,在江汉平原利用沉积物的磁学特征可达到沉积物物源示踪的目的.
In order to establish the magnetic model of sediment tracing in the Jianghan Plain, the magnetic characteristics of the modern sediments imported into the Jianghan Plain have been studied. The results show that: (1) Within the Jianghan Plain, both the Yangtze River and the Han River, The Zhanghe, Zushui, Onyx River and Qingjiang have obvious differences in their magnetic parameters of modern sediments and show excellent correlation with the lithology of the source rocks. (2) The ferro-magnetic minerals in the modern sediments of Hanjiang River are mainly ferrimagnetism minerals, which dominate the magnetic characteristics of the samples. However, the sediments of the Yangtze River have higher ferrimagnetism than the Hanjiang River sediments. (3) Magnetic mineral grains are dominated by pseudo-mononuclear-multidomain, and the magnetic particles in the Yangtze River sediments are generally thicker than those in the Hanjiang River. (4) Among the major tributaries remitted to the Jianghan Plain, the Han ferrous magnetic minerals are far Far higher than other tributaries, and the grains of magnetic minerals are also thicker than those of other tributaries. (5) In the tributaries except the Hanjiang River, the grains of the magnetic minerals in the sediments of the Agate River are relatively fine and the contents of the antiferromagnetic minerals are not quite High, Zhanghe super smooth The content of magnetic material is relatively high while the content of incompletely antiferromagnetic minerals in Qingjiang River is relatively high and the grains of magnetic minerals are relatively coarse.The above results show that the sediment source tracing can be achieved by using the magnetic characteristics of sediments in Jianghan Plain the goal of.