摘要
通过对南海东北部 12 8个表层沉积样品的定量研究 ,揭示了生源和矿物碎屑各组分的分布 ,也显示了组分分析作为一种简单、快速的研究方法在海洋古环境研究中的潜力。研究区生源碎屑的分布明显受与水深相关的深海溶解作用所控制 ,水深 35 0 0～ 40 0 0 m的现代南海 CCD以下 ,钙质生物的含量急剧减少 ,而硅质生物的含量急剧增加。研究区表层沉积中的碎屑矿物主要来源于亚洲大陆 ,吕宋岛的风化产物只起次要作用 。
The compositions of biogenic and mineral clastics in the surface sediments of the northeastern South China Sea(SCS) have been quantitatively examined.This study shows the potential of component analysis as a simple and fast method in the marine paleoenvironmental studies.The distribution of biogenic clastics is obviously controlled by the deep sea dissolution related to water depth.Below 3500 4000 m of the modern CCD in the SCS,calcareous biogenic clastics remarkably decrease while siliceous biogenic clastics increase in abundance.The mineral clastics in the surface sediments of the study area mainly come from the Asian continent,and take weathering materials of Luzon Island as a secondary source.The distributions of these mineral clastics are mainly controlled by the transportation related with the distance to shore and also the sea currents.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2001年第3期17-22,共6页
Marine Geology & Quaternary Geology
基金
国家海洋局海底科学重点实验室资助项目
关键词
生源
矿物碎屑
组分分析
表层沉积
南海
古环境
biogenic and mineral clastics
component analysis
surface sediment
South China Sea
