粤西-琼东北近海沉积物的运移和沉积

吉林大学学报(地球科学版)

粤西-琼东北近海沉积物的运移和沉积

许冬^1，2，3，初凤友³，李家彪³，杨海丽³，陈亮⁴

1.中国科学院海洋研究所，山东青岛266071;
2.中国科学院大学，北京100049;
3.国家海洋局第二海洋研究所/国家海洋局海底科学重点实验室，杭州310012;
4.国家海洋局南海工程勘察中心，广州510300

收稿日期:2013-09-10 出版日期:2014-05-26 发布日期:2014-05-26
通讯作者: 初凤友（1964-），男，研究员，博士生导师，主要从事海洋地质研究 E-mail:chu@sio.org.cn
作者简介:许冬(1982-)，男，博士研究生，助理研究员，主要从事海洋沉积学研究，E-mail:xudongsio@126.com
基金资助:
国家自然科学基金项目（41106046）；海洋公益性行业科研专项项目（201105003）；国家海洋局第二海洋研究所基本科研业务费项目（JG1109，JT1002）

Transport and Deposition of Sediment on the Shelf off Western Guangdong to Northeastern Hainan

Xu Dong^1,2,3, Chu Fengyou³, Li Jiabiao³, Yang Haili³, Chen Liang⁴

1.Institute of Oceanology, Chinese Academy of Science, Qingdao266071, Shandong, China;
2.University of Chinese Academy of Sciences, Beijing100049, China;
3. Second Institute of Oceanography, State Oceanic Administration, /Key Laboratory of Submarine Geosciences,State Oceanic Administration Hangzhou310012, China;
4.South China Sea Marine Engineering Surveying Center,State Oceanic Administration,Guangzhou510300, China

Received:2013-09-10 Online:2014-05-26 Published:2014-05-26

摘要/Abstract

摘要：

为了深入认识珠江现代入海物质在粤西陆架随海流迁移扩散的路径和沉积中心，利用Gao-Collins方法分析了粤西-琼东北近海1 515个站位的粒径趋势，并用²¹⁰Pb法测定了8支柱样的现代沉积速率。结果表明，在粤西沿岸流和南海暖流这两个相向海流的共同作用下，珠江口外珠江来源的泥质沉积物的主体被限制在-50 m等深线以浅的内陆架。现代珠江入海物质能维持粤西陆架泥质沉积区0.1 cm/a左右的现代沉积速率。在川山群岛至海陵岛一带和琼州海峡东侧泥质区，分别受岛屿阻挡和逆时针中尺度涡旋的影响，形成了现代沉积中心。在沉积物不同粒级的来源和搬运方式存在差异的地方，粒径趋势分析结果可能主要反映的是粗颗粒沉积物的运移趋势，而非细颗粒沉积物的运移方向。

关键词: 珠江, 源汇过程, 现代沉积速率, 粒径趋势, 近海沉积物

Abstract:

To better understand the transport path and deposition center of Pearl River originated sediment on the shelf off western Guangdong coast, the grain size trend of 1 515 surface sediments were analyzed by using Gao-Collins method and the modern sedimentation rate of 8 core samples was measured based on ²¹⁰Pb method. The results show that outside the river mouth, the main part of muddy sediment provided by Pearl River was confined to inner shelf with water depth less than 50 m, due to the combined effects of two oppositely flowing current: the coastal current and the South China Sea warm current. A modern sedimentation rate of about 0.1 cm/a on western Guangdong muddy shelf can be maintained by Pearl River originated sediment. Two modern sedimentation centers exist, they are Chuanshan Islands-Hailing Island muddy zone and the muddy area lay east of Qiongzhou Strait, controlled by island blocking and a counter-clockwise mesoscale eddy, respectively. As the source and the way of transport of coarse and fine sediment may be different, the grain size trend result may mainly reflect the transport trend of coarse sediment but not the migrating direction of fine sediment.

Key words: Pearl River, source to sink, modern sedimentation rate, grain size trend, western Guangdong, northeastern Hainan

中图分类号:

许冬，初凤友，李家彪，杨海丽，陈亮. 粤西-琼东北近海沉积物的运移和沉积[J]. 吉林大学学报(地球科学版), 2014, 44(3): 905-917.

Xu Dong, Chu Fengyou, Li Jiabiao, Yang Haili, Chen Liang. Transport and Deposition of Sediment on the Shelf off Western Guangdong to Northeastern Hainan[J]. Journal of Jilin University(Earth Science Edition), 2014, 44(3): 905-917.

参考文献

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