地学前缘 ›› 2022, Vol. 29 ›› Issue (1): 42-53.DOI: 10.13745/j.esf.sf.2021.8.2
易泽邦1(), 付伟1,*(), 赵芹1, 许成1, 陆济璞2
收稿日期:
2021-04-21
修回日期:
2021-07-02
出版日期:
2022-01-25
发布日期:
2022-02-22
通讯作者:
付伟
作者简介:
易泽邦(1990—),男,博士,主要从事纳米地球化学研究。E-mail: yizb@glut.edu.cn
基金资助:
YI Zebang1(), FU Wei1,*(), ZHAO Qin1, XU Cheng1, LU Jipu2
Received:
2021-04-21
Revised:
2021-07-02
Online:
2022-01-25
Published:
2022-02-22
Contact:
FU Wei
摘要:
研究风化壳中纳米微粒的稀土元素特征,对于从微观层面揭示我国华南风化壳型稀土矿床成因具有重要意义。以广西平南富稀土花岗岩风化壳剖面(ΣREEmax含量1 201 ×10-6)为典型案例,采用物理方法(超纯水,MQW)和化学方法(Na4P2O7, TSPP)两种技术手段,提取了花岗岩风化产物中的纳米微粒(1~100 nm)。进而采用中空纤维流场流分离-电感耦合等离子质谱仪联用技术(HF5-ICP-MS),对纳米微粒进行了连续分离和表征,同步获得了不同粒径纳米微粒中REE的含量特征。结果指示,化学提取剂TSPP能有效打破花岗岩风化产物中的大颗粒团聚体,它对纳米微粒的提取效率比物理提取方法高102~103倍。在TSPP提取的纳米微粒悬浮液中,REE含量(ΣREETSPP含量)最高可占到风化产物全岩REE总量(ΣREE含量)的80.5 %。纳米微粒主要分布于2~5 nm和10~30 nm两个粒径区间,另有少量粒径为30~80 nm的纳米微粒出现。其中,在2~5 nm微粒中,REE峰位与有机质大分子峰位对应,指示二者在离子键合作用下形成了聚合体。而在10~30 nm微粒中,REE峰位与Al元素峰位相对应,指示REE被黏土矿物纳米微粒吸附或离子交换。此外,本研究还发现轻稀土(LREE)与重稀土(HREE)在纳米微粒中的分布并不一致。其中以La、Ce、Pr和Nd为代表的LREE元素集中出现在2~5 nm和10~30 nm的纳米微粒中,而以Tb和Lu为代表的HREE元素除了在上述两个粒径的纳米微粒中有含量显示外,还分布于30~80 nm的纳米微粒中,指示了花岗岩风化产物中可能存在着相对独立的、与有机质和黏土矿物无直接关联的重稀土纳米微粒矿物。上述发现为进一步认识风化壳型稀土矿床中稀土元素的赋存状态和富集分异过程提供了新的启示。
中图分类号:
易泽邦, 付伟, 赵芹, 许成, 陆济璞. 花岗岩风化壳中稀土纳米微粒的提取、表征及赋存状态研究[J]. 地学前缘, 2022, 29(1): 42-53.
YI Zebang, FU Wei, ZHAO Qin, XU Cheng, LU Jipu. Extraction, characterization and occurrence state of REE-bearing nanoparticles from granite-derived regolith[J]. Earth Science Frontiers, 2022, 29(1): 42-53.
图2 研究区地质简图(a)和风化壳研究剖面野外地质特征和采样位置(b)(图2a据文献[29])
Fig.2 (a) Simplified geologic map of the study area (modified from [29]) and (b) field photo of the profile of granite-drived regolith showing its geologic features and the sampling positions
表1 六陈花岗岩风化壳剖面不同深度下REE总量与TSPP和MQW提取纳米微粒悬浮液中REE含量分析结果
Table 1 Comparison of the total REE content at different depth in the Liuchen granite-derived regolith profile with REE contents in TSPP and MQW extracted nanoparticle suspensions
图3 研究剖面最大值标准化REE含量垂直分布曲线(黑线)与TSPP提取REE效果对比(红线)
Fig.3 Vertical distribution of normalized REE concentrations in the studied profile (black curve) in comparison with REE extraction results by TSPP (red curve)
图4 HF5-ICP-MS揭示的纳米微粒粒径-稀土元素含量对应关系图
Fig.4 Corresponding relationships between particle size and REE content in nanoparticles for representative LREEs/HREEs occurred in total (black), highly (red) and semi-weathering (blue) granite as revealed by HF5-ICP-MS analysis
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