摘要
根据1983年9月—1984年7月所调查的南海中部91个表层沉积物中Fe,Mn等18种元素分析并结合其它资料的详细研究结果表明:(1)南海中部沉积物具有在近海—深海环境下形成的半深海沉积物的地球化学特征;(2)元素含量分布规律是,Al,K,Fe,Mg,Cu,Ce,Ni,Ba,Mn,Zn,Pb,N含量从陆架外缘到陆坡直至深海递增;Ca,Sr,C_(有机)从陆架外缘到陆坡含量渐增,由陆坡向深海锐减;Si和Ti含量在陆坡低、陆架外缘和深海高;(3)因子分析得出三种元素组合,即常量元素Al,Si,K,Fe,Mg,Ti,微量元素Cu,Co,Ni,Mn,Ba和Ca,Sr,C_(有机),N组合;(4)沉积物元素组成和含量的主要控制因素是沉积物类型。
The analyses of 18 elements in 91 surface sediments from the Central South China Sea (12-21℃, 110-118℃, 1983.9-1984.7) reveal the following geochemical characteristics: (1) its sediments are characterized by the geochemistry of semipelagic sediments; (2) the distribution trends of element content are that, Al, K, Fe, Mg, Cu, Co, Ni, Ba, Mn, Zn, Pb and N contents increase gradually from the outer continental shelf to the continental slope to the deep-sea; and Ca, Sr, organic carbon also increase slowly from the outer shelf to the slope, but decrease rapidly from the slope to the deep-sea; Si, Ti concentrations are higher on the outer shelf and in the deep-sea than on the slope; (3) three element assemblages have been obtained by means of the factor analysis: namely major element Al, Si, K, Fe, Mg, Ti; minor element Cu, Co, Ni, Mn, Ba; and Ca, Sr, N, organic carbon of the dominance of biochemical precipitation; (4) the major controlling factor of chemical compositions and contents of elements in the sediments is sediment types, water depth and organisms(such as foraminifera) mark clearly regional influences for Ca, Sr, N and organic carbon, submarine volcanism appears to be important for Cu, Ba and some other metal elements; (5) the principal source of sediments in the Central South China Sea is the Asian continent (mainly China).
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1991年第3期253-263,共11页
Oceanologia Et Limnologia Sinica
