Influence of goethite nanophase on rare-earth element patterns and enrichment in marine phosphates during early diagenesis
文献类型：期刊论文
| 作者 | Xing, Jieqi1,2,3; Li, Shan1,2,3; Wei, Hongyan1,2,3; Xi, Jiaxin1,2,3; Lin, Xiaoju1,2; Yang, Yiping1,2; Xian, Haiyang1,2; Tan, Wei1,2; Wei, Jingming1,2 ; Zhu, Jianxi1,2,3
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| 刊名 | CHEMICAL GEOLOGY
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| 出版日期 | 2024-05-20 |
| 卷号 | 653页码:10 |
| 关键词 | Fe redox cycling REE patterns Authigenic phosphates Authigenic carbonates Paleoenvironmental condition |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2024.122029 |
| 英文摘要 | Although rare-earth elements (REEs) in authigenic phosphates and carbonates derived from marine sediments are potential proxies (e.g., REE patterns) for reconstructing paleoenvironmental conditions, the REE patterns appear to be inconsistent. Some marine authigenic phosphates show a "bell-shaped" pattern with an enrichment of the middle REEs (MREEs; Nd - Ho), while others exhibit a "modern seawater-like" pattern characterized by a strong depletion in cerium and an enrichment in heavy REEs (Er - Lu, Y, and Sc). Although the origin of the "bellshaped" pattern in phosphates has been extensively debated, the evidence is often ambiguous; therefore, the origin of the pattern remains unclear. In this study, we investigate the microscale and nanoscale mineralogical and geochemical characteristics of the REE-enriched Early Cambrian phosphorites. In situ elemental analyses reveal that the codeposited phosphates ("bell-shaped" REE pattern) and carbonates ("modern seawater-like" pattern) have different REE patterns. A microscale investigation shows that phosphate grains contain some dispersed goethite nanophase, and a nanoscale investigation using transmission electron microscopy coupled with electron energy-loss spectroscopy shows that Fe 2 + is distributed along the rim of the goethite nanophase, indicating that the goethite were reduced. These findings suggest that the REE pattern and concentration in phosphates could have been influenced by the release of REEs during the reduction of Fe (oxyhydr)oxide in the early diagenetic process before the final deposition. Although additional evidence is required, our results are important for understanding the effects of Fe redox cycling on the REE pattern and enrichment in marine authigenic phosphates. In addition, our results suggest that compared with authigenic phosphates, authigenic carbonates would provide a more reliable reconstruction of paleoenvironmental conditions. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001217692400001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77024]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Zhu, Jianxi |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xing, Jieqi,Li, Shan,Wei, Hongyan,et al. Influence of goethite nanophase on rare-earth element patterns and enrichment in marine phosphates during early diagenesis[J]. CHEMICAL GEOLOGY,2024,653:10. |
| APA | Xing, Jieqi.,Li, Shan.,Wei, Hongyan.,Xi, Jiaxin.,Lin, Xiaoju.,...&Zhu, Jianxi.(2024).Influence of goethite nanophase on rare-earth element patterns and enrichment in marine phosphates during early diagenesis.CHEMICAL GEOLOGY,653,10. |
| MLA | Xing, Jieqi,et al."Influence of goethite nanophase on rare-earth element patterns and enrichment in marine phosphates during early diagenesis".CHEMICAL GEOLOGY 653(2024):10. |
入库方式： OAI收割
来源：广州地球化学研究所
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