摘要
研究了南海东沙群岛附近海域表层沉积物中二类粒级（０．０６３～０．１２５ｍｍ和０．１２５～０．２５ｍｍ）的碎屑矿物。结果表明，碎屑矿物共有５２种，其中轻矿物１５种，重矿物３７种；前者平均含量为９８．８３％，后者仅为０．５２％。依据主要矿物的含量和分布特征，将该海域划分为三个矿物组合带．从海岸向陆架、陆坡，陆源碎屑逐渐减少，生物源物质不断增多；水深６７０～７４０ｍ的陆坡内褐铁矿含量较高，表明该区处于水体交换频繁的高能氧化环境．
We have studied the clastic minerals of two sizes (0.063～0.125 mmand 0. 125～0.25 mm)collected from the surface sediment of the adjacent sea Dongshaarchipelago in the South China Sea. The results show that there are 52 minerals of which 15are light and 37 are heavy minerals. The content of light minerals is on average 98. 82%,andof heavy minerals is only 0.52%,According to the content and the distribution feature of them3jor minerals,three minerals regions are divided.From the coast to the continent slope,thecontent of continental clastics is gradually decreased, biogenic matters are gradually in-creased.The content of limonite at depht 670～740 m is higher,which shows these areas areunder the strong oxidizing environment with frequent exchange of seawater.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
1994年第3期380-385,共6页
Journal of Xiamen University：Natural Science
基金
国家自然科学基金
关键词
碎屑矿物
沉积作用
海洋沉积物
Clastic mineral,Distribution,Sedimentation,Dongsha archipelago,The South China Sea
