东海DGKS9617岩芯物源研究

Provenance Study of Core DGKS9617 in the East China Sea

东海内陆架东北部DGKS9617岩芯以55cm为界明显地分为两个沉积相,岩芯下部(55～851cm)潮流作用明显,为浅海潮流相,而上部(0～55cm)潮流作用不明显,为浅海相沉积。岩芯的重矿物含量特征,Fe、Mn、V、Cr、Ni、Cu、Zn等7个元素的判别函数计算结果,以及碳酸盐分析和Ba—Sr—Zn三角判别图均一致显示岩芯沉积物的重矿物和元素地球化学特征与长江沉积物类似,柱样沉积物主要来源于长江,虽然不同沉积相的沉积环境差别较大,但其物质来源并未发生变化。

Piston Core DGKS9617, which is located in northern part of the East China Sea, is divided into two sedimentary facies: tidal shallow marine facies (55 851cm), in which tidal current played an important role in the sedimentation of this part, and shallow marine facies (0 55cm). Although the lower and the upper part has different sedimentary environment, the provenance of the whole core does not change. The character of heavy mineral assemblage, the results of discrimination function of Fe, Mn, V, Cr, Ni, Cu, Zn, carbonate analysis and Ba Sr Zn ternary diagram consistently show that the mineral and geochemical characteristics of Core DGKS9617 are similar to the Changjiang River sediment, implying that its sediment is mainly provided by the Changjiang River.