Re-evaluation and optimisation of dissolution methods for strontium isotope stratigraphy based on chemical leaching of carbonate certificated reference materials
文献类型：期刊论文
| 作者 | Li, Youlian1,2,3; Li, Chaofeng1,3; Guo, Jinghui1,3 |
| 刊名 | MICROCHEMICAL JOURNAL
 |
| 出版日期 | 2020-05-01 |
| 卷号 | 154页码:9 |
| 关键词 | Strontium isotope stratigraphy Carbonate Sr isotope analysis Chemical leaching methods |
| ISSN号 | 0026-265X |
| DOI | 10.1016/j.microc.2020.104607 |
| 英文摘要 | Strontium isotope stratigraphy (SIS) is widely used in geoscience as a chemo-stratigraphic tracer. In past SIS research, diverse sample dissolution methods have been developed and applied to bulk carbonate rocks to extract target Sr isotope signatures of primary carbonates, which are easily contaminated with Sr from extraneous phases. However, the accuracy of the various dissolution methods is debated because all carbonate materials in previous studies were collected directly from the field and did not undergo strict homogeneity examination before sample dissolution. To verify and evaluate the actual bias for carbonate in SIS research, in this study, we analysed a set of artificial carbonate mixed standard samples including carbonate certificate reference materials (CRMs) GBW03105a for limestone and JDo-1 for dolostone in addition to that for clay minerals, GBW03103. These samples were verified to be stable in their Sr concentrations and Sr-87/Sr-86 ratios and could be used as benchmarks to enable reasonable evaluation on the extraction method for carbonate materials. We conducted a subtle chemical leaching experiment with 12 steps on these samples after preleaching by ammonium acetate. Our results show that the acidic preleach is useful in diminishing the Sr contamination from the extraneous phases. Nevertheless, the Sr contamination from the clay mineral can not be completely removed by the chemical leaching method and it would be more substantial for carbonate samples with lower purity and relatively lower original Sr-87/Sr-86. Our work suggests an optimised dissolution scheme for carbonate Sr-87/Sr-86 analysis: (1) an acidic preleach to dissolve about similar to 60% of the sample, (2) a further dissolution of similar to 20% of the sample to prepare for the Sr-87/Sr-86 analysis, (3) leaving at least 10% of the sample undissolved. A simplified dissolution protocol with advantage of rapid operational and relatively-high reliability was finally proposed for strontium isotope stratigraphy research, particularly for reconstruction of secular Sr isotope evolution curve. |
| WOS关键词 | SEQUENTIAL EXTRACTION ; PRECISE DETERMINATION ; SEAWATER SR-87/SR-86 ; CAMBRIAN TRANSITION ; SR ISOTOPES ; O-ISOTOPE ; CONSTRAINTS ; ORDOVICIAN ; EVOLUTION ; GEOCHEMISTRY |
| 资助项目 | Natural Science Foundation of China[41703016] ; Instrument Function Developing Project of the Chinese Academy of Sciences[IGG201803] |
| WOS研究方向 | Chemistry |
| 语种 | 英语 |
| WOS记录号 | WOS:000527366200078 |
| 出版者 | ELSEVIER |
| 资助机构 | Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences ; Instrument Function Developing Project of the Chinese Academy of Sciences |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/96214]  |
| 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, Chaofeng |
| 作者单位 | 1.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Sch Earth Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Youlian,Li, Chaofeng,Guo, Jinghui. Re-evaluation and optimisation of dissolution methods for strontium isotope stratigraphy based on chemical leaching of carbonate certificated reference materials[J]. MICROCHEMICAL JOURNAL,2020,154:9. |
| APA | Li, Youlian,Li, Chaofeng,&Guo, Jinghui.(2020).Re-evaluation and optimisation of dissolution methods for strontium isotope stratigraphy based on chemical leaching of carbonate certificated reference materials.MICROCHEMICAL JOURNAL,154,9. |
| MLA | Li, Youlian,et al."Re-evaluation and optimisation of dissolution methods for strontium isotope stratigraphy based on chemical leaching of carbonate certificated reference materials".MICROCHEMICAL JOURNAL 154(2020):9. |
入库方式： OAI收割
来源：地质与地球物理研究所
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