南海东部海域的沉积作用和物质来源研究

张富元; 张霄宇; 杨群慧; 刘传联

南海东部海域的沉积作用和物质来源研究

1.
国家海洋局海底科学重点实验室, 浙江, 杭州, 310012;国家海洋局, 第二海洋研究所, 浙江, 杭州, 310012
2.
浙江大学, 地球科学系, 浙江, 杭州, 310012
3.
中国科学院, 广州地球化学研究所, 广东, 广州, 510640
4.
同济大学, 海洋地质教育部重点实验室, 上海, 200092

基金项目: “九五”国家专项重大资助课题;国家海洋局海底科学重点实验室资助课题(2001-2)

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出版历程
- 收稿日期: 2002-09-06
- 修回日期: 2003-02-21

Research on sedimentations and material sources in the eastern South China Sea

1.
Key Laboratory of Submarine Science of State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Zhejiang University, Hangzhou 310012, China
3.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
4.
Tongji University, Shanghai 200092, China

摘要

摘要: 1998年在南海东部海域采集了195个表层和24个柱状沉积物样,对沉积作用和物质来源研究表明:(1)南海东部海域具有典型的边缘海沉积特征,沉积物主要由陆源碎屑、生物碎屑、火山碎屑、浊流沉积物组成,沉积作用具有多样性;(2)黄岩岛以北海区沉积物中基性岩组分含量为23.2%,陆源硅铝质组分含量为76.8%,这两种组分的理论计算值与海底沉积物实际分布相一致;(3)由碎屑矿物分析得出陆源矿物、混合矿物、自生铁锰矿物和中基性火山矿物四种矿物组合区,矿物组成和含量差异反映了物源和沉积环境的变化;(4)对沉积物中大于0.063 mm的物质全组分分析表明,生源组分占66.97%,其中钙质生物含量为23.43%,硅质生物含量为43.54%,钙质生物高值区主要分布在水深小于3 500 m的海区,硅质生物高值区主要分布在水深大于3 500 m的深水区;(5)南海东部海域火山沉积作用明显,海底扩张区沉积物中铜、钡、铁、锰、钴、镍、砷等金属物质分布与海底构造和海底中基性火山活动密切相关;(6)对沉积物粒度、物质组成和生物化石组合分析表明北部陆坡区69柱187.5~190.0,287.5~280.0,377.5~380.0 cm,深海平原区149柱157~187,187~194 cm,南部陆坡区323柱280~350 cm在粒度上表现出浊流沉积特征;(7)对锶同位素物源示踪和粒度、矿物的研究表明,北部陆源碎屑向南一直扩散到约17 N,西吕宋海槽是亚洲大陆物质特别是我国大陆物质向南海东部海域输运的主要通道.
- 南海东部 /
- 沉积作用 /
- 物质来源 /
- 锶同位素
Abstract: One hundred and ninety-five surface sediment samples and 24 piston core samples were collected from the eastern South China Sea in 1998.Based on these samples,the study of sedimentation and sediment source shows that:(1)The eastern South China Sea has the typical sedimentary charecteristics of the marginal sea;the sediments are composed of the terrigenous clasts,biogenous debris,volcaniclasts and turbidity deposits,and sedimentations are multiple origins;(2)the interm ediate-basic constituent of sediments in the north area of Huangyan Island is 23.2% and the terrigeno us fraction is 76.8%,the theoretial estimates of the two com ponents are quite consistent with the distributions of the submarine sediments.;(3)the mineral analysis shows that there are four mineral assemblages of terrigenous minerals, mixed minerals,authigenic ferromanganese minerals and intermediate-basic volcanogenic minerals,and the mineral constituents and content differences reflect the changes of the material sources and the sedimentary environments;(4)the constituent analysis of being greater than 0.063 mm sediments shows biogenous debris is 66.97%,of which the calcareo us fraction and siliceous one are 23.43% and 43.54% respectively.
- eastern South China Sea /
- sedimentation /
- material source /
- Sr isotope

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