厦门港湾表层沉积物中重矿物Q型因子分析

Q-MODE FACTOR ANALYSIS OF HEAVY MINERALS IN THE SURFACE SEDIMENTS IN THE XIAMEN HARBOUR

本文根据我所1980—1981年厦门港湾海洋环境综合调查资料,对126个站表层沉积物极细砂级中的主要重矿物组合进行Q型因子分析,并探讨其分布的主要影响因素。

Six types and corresponbing assemblage zones of heavy minerals in the Xiamen Harbour are classified besed on the Q-mode factor analysis of 126 samples.Ⅰ1.Magnetite zircon assemblage zone:The comPosition materials are the residual sediments from the nearby red clay coast.This zone is distributed in the neritic sections to the west of the Xunjiang Bay,off northern coast of the Xiamen Island and near the Xinglin Bay-Maluan Bay.Ⅰ2.Magnetite-ilmenite-zireon assembalge zone:Composed of the mate rials transferred from the Jiulong Jiang River,this zone is just situated at the Estuary of the river.Ⅱ3.Biotite-amphibole-epidote assemblage zone:Situated at waters to west of the Dalimu Islet-Gaiji Causeway,the composition materials are from the nearby red clay coast.Ⅱ2.Epidote-biotite-amphibole-andalusite assemblage zone.Situated in the central and southern parts of the outer Harbour and to the south of the Jiulong Jiang Estuary,the composition materials are mainly from the Jiulong Jiang River and the coast.Ⅲ1.Ilmenite-zircon-epidote assemblage zone:Situated at the eastern and northern Parts of the Xunjiang Bay,the composition mate ials are mainly from the Xixi River and the east coast.Ⅲ2.Ilmenite-magnetite-zircon-epidote assemblage zone:Composed of materials from the coast,this zone is situated in the waters south to the Bao zhuyu Islet-Lujiang Channel-southern coast of the Xiamen Island.The above analysis indicates that the sediments in the Xiamen Harbour are mainly from the coastal erosion(especially the erosion of the red clay coast)and the transport of the Jiulong Jiang River.Most of the substances are not from far way.The conclusion of this paper is in good agreement with that by the traditional methods,and the method is clearer and simpler in classifcation of assemblage than that of the traditional one.