中印度洋盆岩心沉积物中稀土元素赋存特征  

Occurrence of Rare Earth Elements in Core Sediments from Central Indian Oceanic Basin(CIOB)

作　　者：卢艳芳 张霄宇[1,2,3] 朱孔阳 王静雅 于淼 黄牧 石学法 Lu Yanfang;Zhang Xiaoyu;Zhu Kongyang;Wang Jingya;Yu Miao;Huang Mu;Shi Xuefa(School of Earth Sciences,Zhejiang University,Hangzhou 310027,China;Hainan Institute,Zhejiang University,Sanya 572000,China;Ocean Academy,Zhejiang University,Zhoushan 316000,China;First Institute of Oceanography,Ministry of Natural Resources,Key Laboratory of Marine Geology and Metallogeny,Qingdao 266061,China)

机构地区：[1]浙江大学地球科学学院,浙江杭州310027 [2]浙江大学海南研究院,海南三亚572000 [3]浙江大学海洋研究院,浙江舟山316000 [4]自然资源部第一海洋研究所,自然资源部海洋地质与成矿作用重点实验室,山东青岛266061

出　　处：《中国稀土学报》2023年第5期1006-1021,I0005,共17页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(41773005);国际海域资源调查与开发“十三五”课题(DY135-R2-1-01)资助。

摘　　要：为了定量查明中印度洋洋盆富稀土沉积物中稀土元素和钇(REY)的赋存特征,对采集自中印度洋洋盆的GC04, GC11以及90°海岭东侧的GC03等三根重力柱沉积物分别进行了矿物分析、元素检测,并对沉积物中的单矿物进行了元素的微区原位检测。结果表明,相比较GC03岩心,GC04和GC11岩心沉积物稀土元素富集,稀土元素分配模式和岩心上层矿物组成都表现为典型富稀土深海沉积物。定量计算表明稀土元素主要分配在磷灰石、斜发沸石和大隅石集合体中。研究认为,中印度洋洋盆沉积物中稀土元素富集主要和生物磷灰石密切相关,同时明显受到了来自陆源的火山物质的显著影响。而位于90°海岭东侧的GC03更多受到陆源物质的影响,稀释了沉积物中稀土元素的含量。In order to quantify the allocation of rare earth elements and yttrium(REY)in different minerals in the REY-rich sediments of the Central Indian Ocean Basin(CIOB),three collected sediment cores(GC04,and GC11 from CIOB;GC03 from east of the Ninety East Ridge)were sampled for mineral identification,elements(major,trace,and rare earth elements)measurements in the bulk sediment and part of elements analysis in in⁃dividual minerals.The results show that the core sediments of GC04 and GC11 are enriched in REY,and the distribution pattern of REY and the upper mineral composition are typical REY-rich sediments differing from GC03 sediments.The quantitative calculation shows that apatite,titanite,clinoptilolite-K and osumilite aggre⁃gates contribute most of REY in the core sediments.It is concluded that the REY enrichments in GC04 and GC11 sediments from the CIOB are mainly related to biological apatite,and are obviously influenced by volcano⁃genic materials.GC03,located at east of the Ninety East Ridge,and more affected by terrigenous materials,which dilute the content of REY in the sediments.

关 键 词：稀土元素 地球化学特征 深海沉积物 赋存矿物 中印度洋洋盆 

分 类 号：P595[天文地球—地球化学] P736.21[天文地球—地质学]