Whole rock and pyrite geochemistry of the low-grade metamorphic sediments trace the redox conditions in the ocean during the Tonian
文献类型：期刊论文
| 作者 | Hao, Yufei2,3; Wu, Sifan2,3; Deng, Jianghong1,2; Li, Congying1; Sun, Weidong1,2,3; Huang, Jing2,3 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2025-11-05 |
| 卷号 | 695页码:17 |
| 关键词 | Framboidal pyrite Redox conditions Tonian Iron speciation Low-grade metamorphism |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2025.123085 |
| 通讯作者 | Huang, Jing(hjmail@qdio.ac.cn) |
| 英文摘要 | The Tonian Period captures critical co-evolutionary transitions between marine redox conditions and early life, but the sediments that have undergone low-grade metamorphism complicate investigations into contemporaneous marine redox conditions. In this study, comprehensive analysis of whole rock and pyrite chemistry in slates of the Tongtawan Formation (similar to 800 Ma) is conducted to reconstruct oceanic redox conditions and evaluate diagenetic/metamorphic impacts on these sediments. The size of framboidal pyrites mostly ranges from 3.33 to 7.67 mu m, indicating a predominantly ferruginous deep ocean, with minor occurrences of euxinic or dysoxic conditions. However, depressed ratios of highly reactive iron to total iron (i.e., Fe-HR/Fe-T mostly <0.38) in whole rock seem to indicate oxic conditions. This is attributed to the consumption of highly reactive iron due to chloritization during diagenesis/metamorphism. Pyrite morphology and diagnostic trace element ratios confirm its syngenetic to early-diagenetic origins, validating pyrite chemistry as a robust proxy for contemporaneous seawater composition. In situ LA-ICP-MS analyses document pronounced enrichments of elements (e.g., Co, Ni, Mo, and Mn) in pyrites, exceeding typical Tonian and Mesoproterozoic records. These enrichments reflect enhanced inventory in the ocean due to atmospheric and oceanic oxygenation-with Mo exhibiting the most diagnostic response-and additional fluxes from the erosion of mafic/ultramafic rocks and from hydrothermal inputs linked to the mantle plume and Rodinia breakup (e.g., Co, Ni, and Mn). This indicates Tonian oceans possessed a significantly expanded element reservoir during the Tonian, displaying enhanced oxidation levels despite largely ferruginous deep waters against a backdrop of increasing atmospheric oxygen. |
| WOS关键词 | SOUTH CHINA ; FERRUGINOUS CONDITIONS ; STATISTICAL-ANALYSIS ; FRAMBOIDAL PYRITE ; ELEMENT CONTENT ; HUNAN PROVINCE ; YANGTZE CRATON ; VOLCANIC-ROCKS ; MANTLE PLUME ; BREAK-UP |
| 资助项目 | National Natural Science Foundation of China[42173060] ; National Key Research and Development Program of China[2023YFF0807102] ; Taishan Scholar Program of Shandong[tspd20230609] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001596494900001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/203641]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Huang, Jing |
| 作者单位 | 1.Laoshan Lab, Ocean Sci & Interdisciplinary Frontiers, Qingdao 266237, Peoples R China 2.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hao, Yufei,Wu, Sifan,Deng, Jianghong,et al. Whole rock and pyrite geochemistry of the low-grade metamorphic sediments trace the redox conditions in the ocean during the Tonian[J]. CHEMICAL GEOLOGY,2025,695:17. |
| APA | Hao, Yufei,Wu, Sifan,Deng, Jianghong,Li, Congying,Sun, Weidong,&Huang, Jing.(2025).Whole rock and pyrite geochemistry of the low-grade metamorphic sediments trace the redox conditions in the ocean during the Tonian.CHEMICAL GEOLOGY,695,17. |
| MLA | Hao, Yufei,et al."Whole rock and pyrite geochemistry of the low-grade metamorphic sediments trace the redox conditions in the ocean during the Tonian".CHEMICAL GEOLOGY 695(2025):17. |
入库方式： OAI收割
来源：海洋研究所
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