摘要
对南海表层沉积物中的细粒组分进行电感耦合等离子体质谱法测试,探讨南海稀土元素分布特征及其影响因素.结果表明,南海表层沉积物中稀土元素分布主要与陆源物质输入、生物活动和火山物质补给密切相关.南海细粒组分的配分模式与中国黄土的接近,与周边的珠江、湄公河等河流输入物质也有相似性,而与南海碱性玄武岩存在显著差异,表明南海沉积物主要来自于周边大陆.稀土元素趋势分析表明,珠江口往外至海南岛南部海域中沉积物朝东南方向向陆坡输送;台西南至珠江口往外海域沉积物大多向南输运;吕宋岛西部海域包括黄岩岛附近海域的火山物质主要向西北方向输送,向西可达113°E、向北可至20°N附近;南海南部沉积物整体上向南沙海槽西北部附近海域输送.
Rare earth elements （REE） in the fine-grained fraction of surface sediments were detected by ICP-MS analysis, to study distribution characters of REE and the influencing factors in the South China Sea. Results reveal that distribution of REE in sediments is mainly related with continental input, biological effects and provision of volcanic materials in the South China Sea. The REE NASC normalization distribution pattern of average fine-grained fraction in the South China Sea is similar to that in Chinese loess, and also those of coastal rivers including the Pearl River and Mekong River, but sharply different from that of Cenozoic basalts from the South China Sea, indicating that fine-grained fraction was mostly derived from the mainland substance. Trend analysis of REE indicates that fine-grained fraction between the Pearl River Mouth and the southern Hainan Island was transported into the slope in the southeastern direction, while sediments between the southwestern Taiwan Island and the Pearl River Mouth were mostly transported southward. Sediments in the western Luzon Island and near the Huangyan Island were mainly conveyed northwestward, which could reach 113°E in the west and 20°N in the north. In the southern South China Sea, sediments were wholly transported towards the northwestern Nansha trough.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2010年第4期563-571,共9页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金(No.40631007)
国家"973"项目(Nos.2007CB815905
2009CB219502)
国家基金委-广东联合基金(No.U0733003)
国家科技支撑计划项目(No.2006BAB19B03)
中国科学院知识创新工程领域前沿项目(Nos.SQ200713
LYQY200704)
中国科学院边缘海地质重点实验室开放基金(No.MSGL08-16)
中国科学院海洋地质与环境重点实验室开放基金(No.MGE2008KG08)
关键词
稀土元素
地球化学
表层沉积物
细粒组分
趋势分析
南海.
rare earth elements
geochemistry
surface sediments
fine-grained fraction
trend analysis
South China Sea.
