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	Extreme sulfur isotope heterogeneity in individual Ediacaran pyrite grains revealed by NanoSIMS analysis
通讯作者	Wang, Wei([email protected])
	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
	2025
发表期刊	MARINE AND PETROLEUM GEOLOGY
ISSN	0264-8172
卷号	171页码:14
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.
关键词	Ediacaran Lantian Formation Pyrite In situ delta S-34(py) Microenvironment
DOI	10.1016/j.marpetgeo.2024.107201
收录类别	SCI
语种	英语
关键词[WOS]	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
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001358358500001
项目资助者	National Key Research and Development Program of China ; Chinese Academy of Sciences ; National Natural Science Foundation of China
出版者	ELSEVIER SCI LTD
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44584
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.

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