Progress in techniques and methods for uncontaminated and highly efficient separation of zircon from geological samples
文献类型：期刊论文
| 作者 | Guo Qian1; Liu Tong1; Fei ChenHui1; Guo Shun1; Li QiuLi1,2 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2023-09-01 |
| 卷号 | 39期号:9页码:2857-2866 |
| ISSN号 | 1000-0569 |
| 关键词 | Zircon High voltage pulse fragmentation Acid-based separation Mafic rocks U-Pb geochronology |
| DOI | 10.18654/1000-0569/2023.09.18 |
| 英文摘要 | Zircon (ZrSiO4) is the most extensive used mineral for dating, and uncontaminated and efficient extracting zircons from geological samples is a prerequisite for obtaining representative and accurate information. The conventional zircon separation method, which is based on the high density and non-magnetism of zircon, depends on mechanical crushing and different hydrodynamic conditions. However, it is prone to be contaminated in mechanical crushing process and low efficiency in separation process. To solve these two problems, this study reviews and summarizes the previous uncontaminated grinding technology and the high-efficiency mineral separation methods, and combines the high voltage pulse crushing technology, high temperature annealing and acid-based separation method. A new zircon separation process was developed to achieve uncontaminated and a high yield of zircon: high voltage pulse fragmentation -> (annealing) -> HF + HNO3 dissolution -> HCl + H3BO3 dissolution. The different methods were compared by mafic samples with low zircon content. For samples bearing coarse-grained zircon (>= 50 mu m) this new method can recover more than 6 times of zircon as the conventional method. For samples bearing only fine-grained zircon (<50 mu m), this method can successfully recover zircon grains from tens of grams of the sample, while the conventional method cannot recover any zircon grains, even if using kilograms of the sample. The Raman measurements reveal that acid treatment for several hours does not affect the crystallinity of zircon with intermediate crystallinity, and annealing can improve the zircon crystallinity. The Secondary Ion Mass Spectrometry (SIMS) U-Pb analyses demonstrate that the zircon grains recovered by the acid-based and annealing-acid-based separation methods show undetectable Pb loss during acid treatment. Using the new separating process and combined with SIMS U-Pb dating, we report the ages of a flowerlike gabbro from Luoyang (similar to 1831 Ma) and a basalt from the middle part of Yarlung Zangbo River (similar to 164Ma) for the first time, demonstrating that the improved zircon separating process is practical and effective. The popularization of the new zircon separating process is expected to significantly expand the zircon application in the study of mafic rocks. |
| WOS关键词 | LIBERATION ; METAMICTIZATION ; CHINA |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:001059083200018 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/110797]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Li QiuLi |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo Qian,Liu Tong,Fei ChenHui,et al. Progress in techniques and methods for uncontaminated and highly efficient separation of zircon from geological samples[J]. ACTA PETROLOGICA SINICA,2023,39(9):2857-2866. |
| APA | Guo Qian,Liu Tong,Fei ChenHui,Guo Shun,&Li QiuLi.(2023).Progress in techniques and methods for uncontaminated and highly efficient separation of zircon from geological samples.ACTA PETROLOGICA SINICA,39(9),2857-2866. |
| MLA | Guo Qian,et al."Progress in techniques and methods for uncontaminated and highly efficient separation of zircon from geological samples".ACTA PETROLOGICA SINICA 39.9(2023):2857-2866. |
入库方式： OAI收割
来源：地质与地球物理研究所
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