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为了深入了解西南印度洋中脊调查区表层沉积物的物质来源和沉积环境,对大洋第30航次在该区域获取的21个表层沉积物样品进行了物相鉴定和主量元素、微量元素及稀土元素含量测试,分析结果显示,样品可分为Si质沉积物和Ca质沉积物两类,其中Si质沉积物富含Si、Mg、Fe、Al,稀土元素含量特征、轻重稀土元素分馏特征,以及稀土元素的北美页岩归一化曲线均表明沉积物保留了N-MORB的特征,主要为基性岩、超基性岩的风化产物;而Ca质沉积物富Ca、LOI、Sr,稀土元素以及微量元素之间的分配均指示沉积物物源为生源主导;所有站位均显示了两类沉积物不同程度的混杂,表明物质来源具有一定的多样性,调查区总体为稳定的偏氧化环境。
In order to understand the source of sediment and depositional environment of surface sediment in the Southwest Indian Ridge survey area, 21 surface sediment samples obtained from the 30th oceanic ocean in this area were identified and the major and trace elements, rare earth elements The results of the analysis show that the samples can be divided into two types: Si quality sediments and Ca quality sediments. Among them, Si quality is rich in Si, Mg, Fe, Al, rare earth elements, light and heavy rare earth elements, The North American shale normalization curves of REEs show that the sediments retain the characteristics of N-MORB, mainly the weathering products of basic rocks and ultrabasic rocks. The Ca-bearing sediments are rich in Ca, LOI, Sr, rare earth elements And the distribution of trace elements all indicate that the source of sediment is the source of bio-source. All the stations show the mixed degree of the two types of sediments to some extent, indicating that the source of the material has a certain diversity. The survey area is generally stable partial oxidation environment .