摘要
通过对南黄海泥质区西北缘B01孔黏土粒级沉积物的主量、微量和稀土元素的地球化学特征分析,探讨其物质来源及其影响因素。B01孔岩芯黏土粒级沉积物主量、微量和稀土元素在垂向上具有明显变化,以150cm为界,上段元素含量波动强烈,下段相对稳定,B01岩芯黏土粒级沉积物轻重稀土分馏明显,轻稀土元素含量较高,经球粒陨石标准化的δEu明显负异常,δCe无明显异常,呈现负斜率右倾的稀土元素配分模式;经上陆壳(UCC)标准化的δEu和δCe均无明显异常,表明B01岩芯沉积物为陆源物质。(La/Yb)UCC—(Gd/Yb)UCC判别图、La/Sc、Th/Sc和判别函数结果表明B01岩芯具有黄河和长江混合物源特征,在这个物源体系中,黄河与长江物质交替出现,可能是受黄河改道和陆架沉积动力因素的影响,冷水团的形成与演化、黄海暖流的路径及强度变化和受季风驱动的黄海沿岸流都对B01岩芯的物源起到重要作用。
The south yellow sea B01 hole clay-grains sediment were studied to the geochemical characteristics of major trace and rare earth elements.The authors discussed the material source,sedimentary environment evolution and shelf in the south yellow sea since the holocene sediments from the source to the transfer process.The results show that clay size fractions elements reflect the effect of land-control substance.According to the clay tablets level elements factor analysis,the main controlling factor is terrigenous elements,followed by restricted depositional environment,changing in redox conditions in the form of a direct impact on the occurrence of elements and content level.Besides that,it also affected by the extent of sediment chemical weathering effects.Clay grain size chondrite and upper continental crust distribution patterns show that LREE is significantly higher than HREE.δEu has obvious negative anomaly andδCe shows no obvious abnormalities after chondrite normalized.By the upper continental crust（UCC）standardized,δEu andδCe shows no obvious abnormalities.（La/Yb）UCC—（Gd/Yb）UCCdiscrimination show a mixed sediments resourse.The Yangtze River,Yellow River both have contributions to B01 core.Geochemical characteristics of B01 core clay sediments show response to Yellow River diverted and the sedimentary dynamic.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第10期82-91,共10页
Periodical of Ocean University of China
基金
国家自然科学基金项目(41376053)资助~~
