摘要
通过对东海外陆架-陆坡-冲绳海槽表层沉积物粒度和黏土矿物组成的分析,探讨了3个不同沉积单元底质沉积物成因及物质来源。结果表明,东海外陆架→陆坡→冲绳海槽,沉积物粒度整体上逐渐变细。东海外陆架沉积物具有明显海滩砂或者破浪带砂的特征,为晚更新世冰消期海侵的产物,属于"残留沉积"。海槽西坡沉积物粒度参数具有重力流沉积特征,反映了沉积物由外陆架向海槽以滑塌或重力流的搬运方式。海槽槽底细颗粒沉积物悬移组分占主导的特点体现了半深海沉积特征,其主要来源于台湾和中国大陆长江、闽江等入海河流。物质来源一方面反映了黑潮对于细颗粒台湾源物质的输运的巨大作用;另一方面体现了来源于中国大陆源细颗粒物质存在以近底侧向搬运、"冬贮夏输"悬浮搬运等多种输运机制。
Grain size and clay mineral composition are analyzed for the surface sediments in various depositional units of the East China Sea including its outer shelf and slope,and the Okinawa Trough.Upon the basis,the origin and provenance of the sediments are discussed.Results show that the grain size of the sediments becomes finer gradually from the outer continental shelf,slope,to the Okinawa Trough.The sediments in the outer continental shelf are dominated by beach sands or breaker zone deposits formed during the deglacial transgression of late Pleistocene,and belong to the so-called ＂relict sediment＂,while the sediment on the western slope of the Okinawa Trough is characterized by gravity flow deposits,indicating a transportation pattern from the outer continental shelf to the Trough.Suspended deposits predominate the bottom fine sediment of the Okinawa Trough,having the characteristics of bathyal deposits.They are mainly from the rivers of Taiwan and China's Mainland,such as the Changjiang and Minjiang Rivers.Provenance study reveals that the fine materials from Taiwan is mainly transported by Kuroshio Current,and the fine sediments from China's Mainland are mainly transported by various transportation mechanisms,such as the＂near-bottom lateral transportation＂and＂storage in winter and transporting in summer.＂
作者
窦衍光
陈晓辉
李军
蔡峰
温珍河
徐刚
邹亮
DOU Yanguang;CHEN Xiaohui;LI Jun;CAI Feng;WEN Zhenhe;XU Gang;ZOU Liang(Key Laboratory of Marine Hydrocarbon Resource of Environmental Geology,Ministry of Land and Resources,China Geology Survey,Qing-dao Institute of Marine Geology,Qingdao 266071,China;Laboratory for Marine Geology and Environment,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China)
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2018年第4期21-31,共11页
Marine Geology & Quaternary Geology
基金
1：25万锦西、日照和霞浦县等图幅海洋区域地质调查(DD20160139)
国家自然科学基金项目“晚第四纪以来冲绳海槽中深层水源区演变的沉积记录及其古气候意义”(41776077)
国家重点基础研究发展计划“含金属沉积物的热液活动记录及其沉积模式”(2013CB429704)
关键词
沉积单元
粒度
黏土矿物
底质成因
物质来源
东海
depositional units
grain size
clay mineral
formation reason of surface sediment
sediment provenance
EastChina Sea
