Extreme sulfur isotope heterogeneity in individual Ediacaran pyrite grains revealed by NanoSIMS analysis
文献类型：期刊论文
| 作者 | Hu, Yongliang1,2; Wang, Wei1 ; Zhao, Xianye3; Guan, Chengguo1; Zhou, Chuanming1,4; Song, Chenran1,2; Shi, Hongyi1,2; Sun, Yunpeng1,2; Chen, Zhe1; Yuan, Xunlai1,2
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| 刊名 | MARINE AND PETROLEUM GEOLOGY
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| 出版日期 | 2025 |
| 卷号 | 171页码:14 |
| 关键词 | Ediacaran Lantian Formation Pyrite In situ delta S-34(py) Microenvironment |
| ISSN号 | 0264-8172 |
| DOI | 10.1016/j.marpetgeo.2024.107201 |
| 通讯作者 | Wang, Wei(wwang@nigpas.ac.cn) |
| 英文摘要 | Pyrite sulfur isotopic composition (delta S-34(py)) is a crucial proxy for reconstructing ancient Ediacaran marine environments. However, recent in situ isotopic analyses of sedimentary pyrite have revealed distinct delta S-34(py) signatures among different pyrite morphologies, indicating that secular changes in bulk delta S-34(py) may reflect variations in proportions of different pyrite morphologies rather than environmental signals. Up to now, intragrain isotopic patterns within individual pyrite grains have not yet been extensively investigated for Ediacaran samples. The absence of this specific data set has hindered our ability to understand current complexities of bulk delta S-34(py) in reconstruction paleoenvironment. This study aims to elucidate delta S-34(py) patterns by conducting in situ isotopic analysis on pyrite grains from Ediacaran drill-core samples. We employed scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), Raman spectroscopy, and nanoscale secondary ion mass spectrometry (NanoSIMS) to examine the crystal texture, element atomic ratios (S/Fe), mineral composition, and in situ isotopic composition within single pyrite grains. SEM-EDS observations reveal that the euhedral/subhedral pyrite crystals generally exhibit uniform mineral texture, although some grains show varying degrees of dissolution edges and surface cavities. Raman spectroscopy demonstrates the possible presence of pyrrhotite mineral within pyrite grains at some specific sites and points. In situ isotopic analysis reveals significant intragrain delta S-34 heterogeneity, with difference reaching up to 69.3 parts per thousand on a micrometer scale. Distinct deposition depths and burial rates may contribute to the varying value ranges and degrees of isotopic heterogeneity amongst pyrite grains. A model suggesting rapid precipitation from numerous nucleation sites simultaneously could account for the observed intragrain heterogeneity of in situ delta S-34 values. Pyrite grains exhibit general atomic S/Fe ratios of > 2, potentially due to the presence of trace elements incorporated into the pyrite structure. The occurrence of pyrrhotite leads to a slightly positive correlation between in situ delta S-34(py) values and S/Fe ratios, yet the S-32-enriched pyrrhotite plays less substantial in generating intragrain delta S-34 heterogeneity of pyrite grains. Our findings reveal clear isotopic heterogeneities within individual pyrite grains, in addition to the notable delta S-34(py) differences among pyrite of various morphologies. These results highlight significant microenvironmental heterogeneity and dynamic sulfur pool mixing on rapid short-term timescale during pyrite growth. |
| WOS关键词 | DRIVEN ANAEROBIC OXIDATION ; SULFATE REDUCTION ; SEDIMENTARY PYRITE ; FRAMBOIDAL PYRITE ; ORGANIC-MATTER ; TRACE-ELEMENT ; FRACTIONATION ; SIMS ; CHEMOSTRATIGRAPHY ; PRESERVATION |
| 资助项目 | National Key Research and Development Program of China[2022YFF0800100] ; Chinese Academy of Sciences[XDB0850203] ; National Natural Science Foundation of China[42072036] ; National Natural Science Foundation of China[41921002] ; National Natural Science Foundation of China[42130207] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001358358500001 |
| 出版者 | ELSEVIER SCI LTD |
| 资助机构 | National Key Research and Development Program of China ; Chinese Academy of Sciences ; National Natural Science Foundation of China |
| 源URL | [http://ir.nigpas.ac.cn/handle/332004/44583]  |
| 专题 | 中国科学院南京地质古生物研究所 |
| 通讯作者 | Wang, Wei |
| 作者单位 | 1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Key Lab Palaeobiol & Petr Stratig, Nanjing 210008, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Vrije Univ Brussel, B-1050 Brussels, Belgium 4.Univ Chinese Acad Sci, Nanjing 211135, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, Yongliang,Wang, Wei,Zhao, Xianye,et al. Extreme sulfur isotope heterogeneity in individual Ediacaran pyrite grains revealed by NanoSIMS analysis[J]. MARINE AND PETROLEUM GEOLOGY,2025,171:14. |
| APA | Hu, Yongliang.,Wang, Wei.,Zhao, Xianye.,Guan, Chengguo.,Zhou, Chuanming.,...&Yuan, Xunlai.(2025).Extreme sulfur isotope heterogeneity in individual Ediacaran pyrite grains revealed by NanoSIMS analysis.MARINE AND PETROLEUM GEOLOGY,171,14. |
| MLA | Hu, Yongliang,et al."Extreme sulfur isotope heterogeneity in individual Ediacaran pyrite grains revealed by NanoSIMS analysis".MARINE AND PETROLEUM GEOLOGY 171(2025):14. |
入库方式： OAI收割
来源：南京地质古生物研究所
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