孟加拉东孟加拉湾群岛近代沉积中稀土元素的地球化学特征及存在

F. Deeba, Syed Hafizur Rahman, M. Z. Kabir, Mohammad Rajib
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引用次数: 2

摘要

本研究提出了在东孟加拉湾的两个主要岛屿——库图布迪亚岛和莫赫什哈利岛最近的海滩沉积中稀土元素的地球化学特征和定量。采用重矿物分离、矿物学鉴定、化学成分和元素填图等方法对近地表沉积砂砂样品进行了分析。采用x射线衍射(XRD)、x射线荧光(XRF)、扫描电子显微镜与能量色散光谱(SEM-EDS)等方法进行分析。重液分离法测定不同原料砂样品中重矿物含量,结果表明Kutubdia岛和Moheshkhali岛的重矿物平均丰度分别为69.67%和9.32%。Kutubdia和Moheshkhali砂样品的x射线图显示锆石、石英、赤铁矿、磁铁矿、钛铁矿、铬铁矿、蓝晶石、锐钛矿、金红石和石榴石的存在。用x射线荧光法(XRF)分析了库图布迪亚岛和莫赫什哈利岛重矿砂的主要氧化物和微量元素的化学成分。测定了Na2O、MgO、Al2O3、SiO2、P、K2O、CaO、TiO2、V2O5、Cr2O3、MnO、Fe2O3、CoO、ZnO、SrO、Y2O3、ZrO2、Nb2O5、MoO3、HfO2、WO3、ThO2、U3O8、CeO2、Nd2O和Er2O3的浓度。在少数样品的元素组成中还发现了大量的各种稀土元素。预期这项研究将对这两个岛屿的基线和环境方面有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geochemical Characterization and Presence of Rare Earth Elements in the Recent Depositions at the Islands of the Eastern Bay of Bengal, Bangladesh
This study presents geochemical characterization, as well as, quantification of rare earth elements in the recent beach deposition at the two major islands of the eastern Bay of Bengal-Kutubdia and Moheshkhali. Placer sand samples from near surface depositions were analyzed by heavy mineral separation, mineralogical identification, chemical composition and elemental mapping. X-ray diffraction (XRD), X-ray fluorescence (XRF), Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS) were used to obtain these results. The heavy mineral concentration in different raw sand samples resulted by heavy liquid separation technique revealed that the average abundance of heavy minerals is 69.67% in Kutubdia island and 9.32% in Moheshkhali island, respectively. The X-ray patterns of Kutubdia and Moheshkhali sand samples show the presence of zircon, quartz, hematite, magnetite, ilmenite, chromite, kyanite, anatase, rutile and garnet. Chemical composition of heavy mineral sands from Kutubdia and Moheshkhali islands were analyzed using X-ray fluorescence method (XRF) for major oxides and trace elements. The concentration is of Na2O, MgO, Al2O3, SiO2, P, K2O, CaO, TiO2, V2O5, Cr2O3, MnO, Fe2O3, CoO, ZnO, SrO, Y2O3 ZrO2, Nb2O5, MoO3, HfO2, WO3, ThO2, U3O8, CeO2, Nd2O and Er2O3 were determined. A significant amount of various rare earth elements (REEs) in the elemental composition of few samples was also identified. The study is expected to be useful in the baseline and environmental aspects of both the islands.
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