| 摘要: |
| 东海海底覆盖着一层疏松的沉积物,大体上在内陆架为细粒沉积,外陆架为粗粒沉积,陆坡和海槽区又分布着细粒沉积。从地球化学的角度来看,这些沉积物的组成与海洋中无机悬浮物的组成有着密切的关系。沉积物通过其沉淀和吸附,从海水中吸取微量金属元素。沉积物中,特别是沉积物表面的微量元素的氧化物,对海水中颗粒物质的化学行为有着很大的影响,其化学效应远比沉积物本身的大量化学组成所起的作用要大的多。所以,对沉积物中微量元素的组成及其分布和变化规律的研究,越来越引起地球化学工作者的重视。
本文根据近几年在东海海域采集的74个地质样品,用原子发射光谱法对沉积物中Ti,Cr,Mn,Ni,Cu,Ga和Ba等元素含量測定的数据,对它们的地球化学分布特征和变化规律进行了初步研究和探讨。研究区域位于北纬26°30'至32°30′和东经121°30′至129°00′之间,取样站位如图1所示。大部分样品是1977年和1978年取的样,少数是1974年和1975年取的样。本文所用测定方法与设备同参考文献[1]。 |
| 关键词: 微量元素 分布 变化规律 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第708号 |
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| STUDIES ON THE DISTRIBUTION AND VARIATION OF TRACE ELEMENTS IN THE SURFACE SEDIMENTS OF THE EAST CHINA SEA |
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Hua Wenzhen, Liu Baoshan, Wang Qi, Li Mingzi, Li Hefang, Yang Huimin
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Institute of Oceanology, Academia Sinica
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| Abstract: |
| In the present paper, the elements Ti, Cr, Mn, Ni, Cu, Ga and Ba in 74 surface sediment samples from the East China Sea were determined by atomie emission spectrophotometry of Model ИCJI-28. The error in these determinations was< 25%.The concentration of these elements in the sediments was less than 1%.
The results of the study are shown as follows.
The average concentrations of Ti,Cr, Mn, Ni, Ga and Ba in the sediments appear to increase gradually with the decrease of grain slze of sediments. However, the concentration of Cu varies inversely with the grain size. In the region of the continental shelf of the East China, Sea. the average concentrations of Ni and Ga in the sediments appear to increase obviously with the increase of biogenous sediments. With the increase of the depth of sea water over the continental shelf, the concentrations of Ni and Ga increase at first and then decrease, while the concentration of Ba first decreases and then increases. From the continental slope to Okinawa Trough, the concentrations of all these elements increase, and among them, Mn increases more obviously than others.
The elements Ti, Cr, Cu and Ga in the sediments were derived primarily from the mainland of China, while Mn, Ba and Ni came primarily from the open ocean adjacent to the East China Sea. The elements Ti in the sediments appeared to be transported in several different forms. However, the element Cu was transported within the crystal lattice of rock detritus. The rate of the transportation of Ti in the East China Sea was low, and its sedimentary rate was higher than those of other elements, but for Ni it was to the contrary.
In the upwelling area, the trace elements were abundant. |
| Key words: DISTRIBUTION VARIATION TRACE ELEMENTS SURFACE SEDIMENTS |
