| 中印度洋海盆富稀土沉积地球化学特征及富集机制研究 |
| |
| 引用本文： | 孙懿,石学法,鄢全树,刘希军,于淼,黄牧,毕东杰,李佳,朱爱美,高晶晶,汪虹敏,张兆祺.中印度洋海盆富稀土沉积地球化学特征及富集机制研究[J].海洋学报,2022,44(11):42-62. |
| |
| 作者姓名： | 孙懿 石学法 鄢全树 刘希军 于淼 黄牧 毕东杰 李佳 朱爱美 高晶晶 汪虹敏 张兆祺 |
| |
| 作者单位： | 1.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 |
| |
| 基金项目： | 青岛海洋科学与技术试点国家实验室山东省专项（2021QNLM020003-1）；国家自然科学基金（91858209，41706061）；中国大洋矿产资源研究项目（DY135-R2-1-01）；泰山学者攀登计划项目（tspd20181216）；青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室开放基金资助项目（MGQNLM201901）。 |
| |
| 摘 要： | 本文对中印度洋海盆深海富稀土沉积区两根柱样GC02和GC06开展了沉积物涂片观察，X-射线衍射分析，主量、微量和稀土元素分析，以及单矿物原位微区地球化学分析等，探讨了其地球化学特征、物质来源及稀土元素（REY）的富集机制。结果表明，GC02柱状沉积物类型为钙质黏土和沸石黏土，GC06柱状沉积物类型为钙质黏土、含沸石黏土和沸石黏土。稀土元素主要在含沸石黏土和沸石黏土中富集。北美页岩标准化（NASC）配分模式指示沉积物的REY主要来源于海水，矿物学和地球化学等特征表明该地区沉积物陆源组分可能主要源于澳大利亚的风尘物质。元素相关性和CaO/P2O5比值等指示了深海富稀土沉积中REY的主要赋存矿物为生物磷灰石（鱼牙/骨等），其次为铁锰微结核。本文总结和探讨了深海富稀土沉积的形成机制，完善了深海富稀土沉积形成过程的概念模型。
|
| 关 键 词： | 中印度洋海盆 富稀土深海沉积物 地球化学 稀土来源 赋存矿物 富集机制 |
| 收稿时间： | 2022-03-14 |
The study on geochemical characteristics and enrichment mechanism of deep sea REY-rich sediments in the Central Indian Ocean Basin |
| |
| Institution: | 1.Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China2.Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China3.Guangxi Key Laboratory of Hidden Metallic Ore Deposils Exploration, Guilin University of Technology, Guilin 541004, China |
| |
| Abstract: | In this paper, sediment smear observations, X-ray diffraction analyses, major, trace and rare earth elements analyses, and in situ micro zone geochemical analyses of single minerals were carried out on samples of core GC02 and GC06 from the rare earth-rich deep-sea sediments in the Central Indian Ocean Basin to explore their geochemical characteristics, material sources and enrichment mechanisms of rare earth elements (REY). The results show that the sediment types of core GC02 are calcareous clay and zeolitic clay, and the sediment types of core GC06 are calcareous clay, zeolite-bearing clay and zeolitic clay. Rare earth elements are enriched in zeolite-bearing clays and zeolitic clays. The North American Shale Composite (NASC) Standardized patterns of REY in the sediments indicate a possible seawater origin. Mineralogical and geochemical signatures indicate that the terrestrial fraction of these sediments in the study area should be the eolian dust material originated primarily from Australian. Elemental correlations and CaO/P2O5 ratios indicate that the main host mineral of REY in REY-rich deep-sea sediments is bioapatite (fish teeth/bone), followed by Fe-Mn micronodule. This study summarizes and discusses the formation mechanism of REY-rich sediments and improves a conceptual model for the formation process of REY-rich sediments. |
| |
| Keywords: | |
|
| 点击此处可从《海洋学报》浏览原始摘要信息 |
| 点击此处可从《海洋学报》下载免费的PDF全文 |
|
