【摘要】 通过对ODP184航次 114 6站位海底岩心沉积物中稀土元素含量及其配分模式的研究 ,确立了其分配规律 ,即相对富集轻稀土 ,Eu亏损等 ,并且与东海大陆架及中国黄土的稀土分布模式相似 ,表明本区沉积物物源主要来自陆源 ,是大陆岩石分化过程的产物。对富集因子的研究也证明了沉积物主要来自陆源。δCe的弱负异常值与∑REE和δEu值一样 ,主要受陆源源区气候环境变化控制 ,而与海水关系不大。稀土元素与生物作用基本无关 ,可能主要是赋存于陆源碎屑矿物的晶格中。通过对岩心沉积物间隙水成分的研究 ,表明成岩环境主要为还原环境。6 8m(mcd)以上主要为硫酸盐的还原作用 ,6 8m以下主要为甲烷的生物生成作用更多还原

【Abstract】 Through the study on the content of rare earth element and its distribution pattern in the sediment of site 1146 of ODP 184, its distribution rule is determined, namely, LREE is relatively enriched and Eu is in depletion. To those of the eastern continental shelf, ocean sediment and loess in China, their REE distribution patterns are similar. So it shows that the source of sediment in the area mainly comes from the continent, and the sediment is the result of demorphism of rock. The research on the enrichment factor (EF) also shows that the continent is the main source of sediment. Weak negative anomaly of δCe, ∑REE and δEu are mainly controlled by the change of climate and environment in the continental source area and they are little relevant to the seawater. REE is little correlative with the biological action and may mainly exist in the crystal lattice of clay mineral in the continent. The study on the composition of interstitial water in the sediment shows that diagenesis environment is mainly a reductive environment. The reductive action of sulfate is above 68 mcd and the biological action of methane is under 68 mcd.更多还原