摘要
探讨了NS935钻孔沉积物的部分高场强元素和大离子亲石元素的含量变化,结果表明,Ti、Rb、Ga、Y、Zr、Nb、Cs、Hf、Ta、Th和稀土元素(REE)相互间含量变化具很好的相关关系,反映这些元素均基本来自碎屑组分。经Ti和Sc标准化后这些元素含量的变化,以及Zr/Y等特征元素比值和Ce异常指数Ce/Ce、Eu异常指数Eu/Eu的变化,均反映出碎屑输入的通量或者组成的变化,例如火山灰的富集。其中一些变化与气候变化有关,可能反映周边陆壳的风化强度的波动。NS935钻孔沉积物的不活泼元素记录,可提供反映输入陆壳物源区的环境演变证据。
The variations of the contents of some high field strength elements (HFSE) and some large ion lithophile elements (LILE) have been analyzed for the sediments of Core NS93 5, gathered from Nansha Islands, the South China Sea. The results exhibited that Ti, Rb, Ga, Y, Zr, Nb, Cs, Hf, Ta, Th and rare earth elements (REE) correlated quite well with each other, indicating that they all came from terrestrial detritus. After normalized by Ti or Sc, the variations of the contents of these elements, as well as some elemental ratios, such as Zr/Y, Ce anomaly (Ce/Ce) and Eu anomaly (Eu/Eu), were able to record the variation of terrestrial input, either of the flux or of the components, such as the enrichment of volcanic ash. Among these geochemical proxies, some varied with the climate changes. They probably indicated the variations of the weathering strength of the nearby continental crust. Therefore, the immobile trace element records of the sediments of Core NS93 5 may provide evidences for the environmental changes of the terrestrial source areas in the continental crust.
出处
《地球化学》
CAS
CSCD
北大核心
2001年第3期208-216,共9页
Geochimica
基金
国家自然科学基金重大项目(49999560)
"九五"国家专项南沙群岛及其邻近海域综合科学考察项目专题979260303
