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	Preservation of biosignatures in Neoproterozoic phosphorites metamorphosed at temperatures >450 °C
通讯作者	She, Zhenbing([email protected])
	Cao, Kenan1,2; She, Zhenbing1; Papineau, Dominic1,5,6,7; Nan, Jingbo3; Chen, Chao1,4; Deevsalar, Reza2; Tunc, Ayetullah2; Xiao, Qunfeng8; Huang, Kang-Jun9,10; Pan, Yuanming2
	2025-02-05
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	673页码:19
摘要	There is still much controversy over whether apatite and graphite can be used as fingerprint mineral assemblages to preserve biosignatures in ancient sedimentary rocks that experienced medium- to high-grade metamorphism. Herein, we present a comprehensive analysis of graphite and associated phases from meta-phosphorites of the Huangmailing Formation in the South Dabie Orogen to assess possible preservation of biosignatures. Stratigraphic correlations and previous geochronological data suggest that the protoliths of Huangmailing Formation was deposited in the Ediacaran, and was metamorphosed during the Triassic Dabie Orogeny as documented by our apatite UPb dating. Microcrystalline graphite occurs both as inclusions within metamorphic minerals like apatite, and as matrix-hosted disseminations at grain boundaries of other phases. Bulk organic carbon isotopic analyses yield delta C-13 values between -26.0 parts per thousand and - 15.2 parts per thousand and total organic carbon contents from 0.33 to 3.27 wt%. Raman spectra of the two types of graphites yield an average peak metamorphic temperature of 452 degrees C and 473 degrees C, consistent with the upper greenschist facies to lower amphibolite facies metamorphic conditions in the area. However, the matrix graphites show a wider range of peak temperature variations, likely containing graphitic carbon with lower crystallinity that was affected by retrograde metamorphic fluids. Notably, two prominent Raman bands at around 325 cm(-1) and 395 cm(-1) are observed for the graphite hosted in apatite. This, along with the presence of a peak at 2473 eV in the sulfur K-edge XANES spectra of some graphite in apatite, and the co-occurrence of C-12 and N-14 and local association of S-32 with C-12 in graphite inclusions determined by TOF-SIMS, suggest the possible presence of C-S-Fe and N-bearing compounds and functional groups. TEM and EDS analysis reveal that graphite inclusions in apatite are closely associated with amorphous silica, and mainly occur as well crystallized, polygonal grains around 100 to 200 nm across and has an expanded (002) lattice spacing between 3.43 & Aring; and 3.64 & Aring;. This lattice expansion is attributable to the presence of heteroatoms such as S, Fe and Si, and N, in the graphene interlayers. In contrast, matrix graphites exhibit a wider range of structural and compositional variations than their counterpart as inclusion in apatite, which probably arise from interactions with metamorphic fluids or incorporation of fluid-deposited graphitic carbon. Our study documents the ubiquitous preservation of biological carbon as graphite inclusions in apatite from Huangmailing meta-phosphorites, likely as a result of metamorphic recrystallization of organic-bearing Ediacaran phosphorites. This suggests that the organic matter trapped in sedimentary apatite during their co-precipitation or early diagenesis was probably less modified during metamorphic recrystallization, thus facilitating the preservation of biosignatures.
关键词	Graphite Huangmailing Formation Bio-essential elements Spectroscopy Ultrastructure
DOI	10.1016/j.chemgeo.2024.122519
收录类别	SCI
语种	英语
关键词[WOS]	CARBONACEOUS-MATERIAL GEOTHERMOMETER ; PROTEROZOIC CYANOBACTERIAL BLOOMS ; FLUID-DEPOSITED GRAPHITE ; ABIOTIC SYNTHESIS ; DOUSHANTUO FORMATION ; ISOTOPE COMPOSITIONS ; SUPRACRUSTAL ROCKS ; CONTINENTAL-CRUST ; SEDIMENTARY-ROCKS ; ORGANIC-COMPOUNDS
资助项目	National Key Research and Development Program of China[2023YFC2906601] ; National Natural Science Foundation of China[42172337] ; China Scholarship Council ; Canadian Light Source ; NSERC ; Canada Foundation for Innovation (CFI) ; National Research Council (NRC) ; Canadian Institutes of Health Research (CIHR) ; Government of Saskatchewan ; University of Saskatchewan
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001375861400001
项目资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China ; China Scholarship Council ; Canadian Light Source ; NSERC ; Canada Foundation for Innovation (CFI) ; National Research Council (NRC) ; Canadian Institutes of Health Research (CIHR) ; Government of Saskatchewan ; University of Saskatchewan
出版者	ELSEVIER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44694
专题	中国科学院南京地质古生物研究所
通讯作者	She, Zhenbing
作者单位	1.China Univ Geosci, Sch Earth Sci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China 2.Univ Saskatchewan, Dept Geol Sci, Saskatoon, SK S7N 5E2, Canada 3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 4.Hubei Geol Survey, Wuhan 430034, Peoples R China 5.UCL, Dept Earth Sci, Gower St, London WC1E 6BT, England 6.UCL, London Ctr Nanotechnol, 17-19 Gordon St, London, England 7.UCL, Birkbeck Univ London, Ctr Planetary Sci, London, England 8.Canadian Light Source Inc, 44 Innovat Blvd, Saskatoon, SK S7N 2V3, Canada 9.Northwest Univ, State Key Lab Continental Dynam, Xian 710069, Peoples R China 10.Northwest Univ, Dept Geol, Shaanxi Key Lab Early Life & Environm, Xian 710069, Peoples R China
推荐引用方式 GB/T 7714	Cao, Kenan,She, Zhenbing,Papineau, Dominic,et al. Preservation of biosignatures in Neoproterozoic phosphorites metamorphosed at temperatures >450 °C[J]. CHEMICAL GEOLOGY,2025,673:19.
APA	Cao, Kenan.,She, Zhenbing.,Papineau, Dominic.,Nan, Jingbo.,Chen, Chao.,...&Pan, Yuanming.(2025).Preservation of biosignatures in Neoproterozoic phosphorites metamorphosed at temperatures >450 °C.CHEMICAL GEOLOGY,673,19.
MLA	Cao, Kenan,et al."Preservation of biosignatures in Neoproterozoic phosphorites metamorphosed at temperatures >450 °C".CHEMICAL GEOLOGY 673(2025):19.

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