SIMS and NanoSIMS analyses of well-preserved microfossils imply oxygen-producing photosynthesis in the Mesoproterozoic anoxic ocean

doi:10.1016/j.chemgeo.2016.08.011

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	SIMS and NanoSIMS analyses of well-preserved microfossils imply oxygen-producing photosynthesis in the Mesoproterozoic anoxic ocean
	Peng, Xiaotong2,4,5 ; House, Christopher H.3,6; Chen, Shun2 ; Ta, Kaiwen2 ; Guo Zixiao; Guo, Zixiao1,2,4,5
刊名	CHEMICAL GEOLOGY
	2016-11-01
卷号	441 页码:24-34
关键词	Mesoproterozoic Microfossils Biogenicity Carbon Isotopes Photosynthesis
DOI	10.1016/j.chemgeo.2016.08.011
文献子类	Article
英文摘要	Well-preserved microfossils in the stromatolitic cherts from the Gaoyuzhuang Formation (similar to 1500 Ma), which have one of the best state of preservation in the Proterozoic Era, may play key roles in systematizing information about the evolution of early life in the Proterozoic Ocean. Here, a combination of light microscopy (LM), scanning electron microscopy (SEM), nano-scale secondary ion mass spectrometry (NanoSIMS), secondary ion mass spectrometry (SIMS) and geochemical techniques was employed to characterize themorphology, elemental distributions and carbon isotope values of individual Gaoyuzhuang microfossils, and their growing environment. Light microscopy analyses show that abundant filamentous and coccoid microfossils, classified as oscillatoriacean and chroococcacean cyanobacteria, respectively, are exceptionally well preserved in chert. NanoSIMS analyses show that metabolically important elements, such as C-12(-), C-13(-), (CN-)-C-12-N-14, S-32(-), and S-34(-), are concentrated in these microfossils and that the variations in the concentrations of these elements are similar to each other, establishing the elemental patterns in undoubtedly biogenic microstructures. The carbon isotope (delta C-13) values of individual microfossils range from -31.7 parts per thousand +/- 0.9 parts per thousand to -23.1 parts per thousand +/- 1.0 parts per thousand (weighted mean = -28.5 parts per thousand +/- 0.1 parts per thousand), consistent not only with a Calvin Cycle-based photosynthesis, but typically for chroococcacean cyanobacteria as well. Our results, for the first time, provide the element distributions and cell specific carbon isotope values on convincing Mesoproterozoic cyanobacterial fossils, supporting sustained oxygen-producing photosynthesis in the Proterozoic Ocean. The geochemical data indicate these fossil microorganisms may grow in an anoxic sea water, potentially supporting the delayed oxygenation on the Earth. In this regard, this integrated approach may be a step towards a more comprehensive picture of the evolution of early life on the Earth. (C) 2016 Elsevier B.V. All rights reserved.
学科主题	地球科学 ; 地球化学 ; 地质学 ; 海洋科学
WOS关键词	CARBON-ISOTOPE FRACTIONATION ; INDIVIDUAL PRECAMBRIAN MICROFOSSILS ; ORGANIC-MATTER ; NORTHWESTERN AUSTRALIA ; BANGEMALL GROUP ; ATMOSPHERE ; BACTERIA ; LIFE ; MULTICELLULARITY ; PHYTOPLANKTON
语种	英语
WOS记录号	WOS:000384057800003
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.idsse.ac.cn/handle/183446/1609]
专题	专家咨询委员会研究生部深海科学研究部_深海地质与地球化学研究室
通讯作者	Guo Zixiao
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Deep Sea Sci Div, Sanya 572000, Peoples R China 3.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA 4.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China 5.Tongji Univ, Sch Ocean & Earth Sci, Shanghai 200092, Peoples R China 6.Penn State Univ, Penn State Astrobiol Res Ctr, University Pk, PA 16802 USA
推荐引用方式 GB/T 7714	Peng, Xiaotong,House, Christopher H.,Chen, Shun,et al. SIMS and NanoSIMS analyses of well-preserved microfossils imply oxygen-producing photosynthesis in the Mesoproterozoic anoxic ocean[J]. CHEMICAL GEOLOGY,2016,441:24-34.
APA	Peng, Xiaotong,House, Christopher H.,Chen, Shun,Ta, Kaiwen,Guo Zixiao,&Guo, Zixiao.(2016).SIMS and NanoSIMS analyses of well-preserved microfossils imply oxygen-producing photosynthesis in the Mesoproterozoic anoxic ocean.CHEMICAL GEOLOGY,441,24-34.
MLA	Peng, Xiaotong,et al."SIMS and NanoSIMS analyses of well-preserved microfossils imply oxygen-producing photosynthesis in the Mesoproterozoic anoxic ocean".CHEMICAL GEOLOGY 441(2016):24-34.