湄州湾沉积物地球化学特征

根据湄州湾表层沉积物70个样品18个化学成分的分析结果,得出:本海区沉积物属于海相陆源物,其中细颗粒主要来自台湾海峡,粗颗粒来自当地陆域;化学成分含量按聚类分析,可归为三组:粘土矿物组、碳酸盐组和分散组,微量元素Zn,Cr,Be,Cu和Sr的含量与地壳及台湾海峡相似,但低于胶州湾,说明该海区污染很少。

GEOCHEMICAL CHARACTERISTICS OF SEDIMENTS IN MEIZHOU BAY

This paper discusses the distributional characteristics and material sources of sediments in Meizhou Bay by measuring 70 samples of sediments and the contents of 18 chemical compositions.(1) The content of chemical composition in sediments in this bay fully coincide with crust, the Taiwan Strait .and soil ?yet some have differences compared with other shelf sea bays. The fact that trace elements Ba,Sr,Cr,Cu,Zn are apparently lower than those in Jiaozhou Bay shows that contamination in this sea is light.(2) The ratios of most of the elements in this area are quite similar to that of crust and other bays. This shows that the sediments of this bay belongs to terrigenous deposit of marine facies.(3) The calculation of chemical composition contents further shows that fine particles of clay and silt mainly originate from the Taiwan Strait, and coarse particles of sand come locally.(4) Sediments of Meizhou Bay can be classified into three groups: The clay group containing A12O3, Fe2O3, TiO2, etc. The carbonate group containing CaCO3, CaO, Sr. The scatter group containing Cu, Ba, V, Zr.(5) The distributional rule of content is? The central deep-slot and Wenjiakou are mainly sand, with high shell content and high carbonate content too. At the two sides of the waterway, Shanyao Bay, Shimen Bay and the sediments on top of the bay are mainly clay mineral. Chemical content in the clay group increases along with variation in sediment particles from coarse to fine.