【摘要】 对位于东海内陆架闽浙沿岸泥质区北部的DD2孔进行了粒度分析、AMS14C年龄测试和主元素、微量元素分析,讨论了各元素含量与粒度间的关系,采用R型因子分析探讨了它们间的组合关系。研究表明,近2ka来DD2孔绝大多数主元素和微量元素含量稳定;随粒径变细大部分元素的含量呈现增加的趋势,而Sr和SiO2的含量则呈现减少的趋势;CaO、Na2O、Hf、Zr和Ti等的含量与粒径相关性很差。因子分析的结果表明,DD2孔泥的化学组成可划分为4种组合类型:分别反映沉积物中元素分布的主要特点,样品未经洗盐前处理引起主元素和微量元素组合的变化,Zr、Hf和Nb元素富集于特定粒度组分(粉砂),及钙质生物组分的加入和早期成岩过程中元素的再分配性质等。初步分析表明,Rb、Cu、Ni、V、P、Sc、Fe2O3、Cr、K2O、Nb、Co、Th、Ti和Al2O3为DD2孔中相对不活动的元素,可以将它们与现代长江、黄河沉积物作对比,进行物源分析。Ti/Zr和Cr/Th比值指示该孔沉积物主要来自于花岗质物源区。更多还原

【Abstract】 Based on measurement of grain-size, AMS 14C dating, major and t ra ce elements, relationship between elements and grain-size in Core DD2 is discu ssed. The results show contents of most elements change little during recent 2 k a. And contents of most elements increase, but Sr and SiO2 decrease with lesseni ng grain-size, and poor relationship exists between CaO, Na2O, Hf, Zr, Ti and grain-size. Based on R-model factor analysis, the chemical compositions of t he core can be classified into 4 groups, corresponding to main characteristics o f element distribution in Core DD2, changes of major and trace elements composit ions resulted from salt not being moved, Zr, Hf and Nb being rich in special gra in-size (silt), and joining of calcium carbonate biology and reallocating of s ome elements during early diagenesis, respectively. It is also shown that Rb, Cu , Ni, V, P, Sc, Fe2O3, Cr, K2O, Nb, Co, Th, Ti and Al2O3 are relatively inactive in Core DD2, and its source region was dominantly granite according to Ti/Zr an d Cr/Th.更多还原