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Cellular taphonomy of well-preserved Gaoyuzhuang microfossils: A window into the preservation of ancient cyanobacteria
Guo, Zixiao1,2; Peng, Xiaotong1; Czaja, Andrew D.3; Chen, Shun1; Ta, Kaiwen1; Peng, Xiaotong(Chinese Acad Sci, Inst Deep Sea Sci & Engn, Deep Sea Sci Div, Sanya 572000, Peoples R China)
2018
Source PublicationPRECAMBRIAN RESEARCH
Volume304Pages:88-98
Contribution Rank第1完成单位
Abstract

The ~1500 Ma Gaoyuzhuang microfossils, a representative Mesoproterozoic cyanobacteria assemblage, are crucial for understanding and searching for early Precambrian life on Earth. The cellular taphonomy of fossils in this assemblage is poorly known, however. Here we combined in situ microscopic and microanalytical techniques to study the detailed taphonomy of these microfossils. Light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations show that Gaoyuzhuang microfossils are mainly preserved in black chert layers and that silica particles can be found within fossilized cell walls and sheaths. Raman spectra show the characteristic first-order bands (at 1350 and 1605 cm(-1)) of carbonaceous material comprising microfossils, indicating that they have experienced peak temperatures of 215 to 308 degrees C. Raman maps show the spatial distribution of the carbonaceous matter as well as that of the silica matrix, consistent with nano-scale secondary ion mass spectrometry (NanoSIMS) analyses. Variations in C-13 versus C-12 and S-34 versus S-32 within individual microfossils are likely the result of original differences in the isotopic compositions of cellular components. Confocal laser scanning microscopy (CLSM) analyses provide fluorescence based 2-D and 3-D images of the cellular components of such microfossils at high spatial resolution. The micro scale chemical, isotopic and structural heterogeneities together with the subcellular morphological features support the preferential preservation of cyanobacterial cell walls and sheaths over cell contents in Precambrian chert. We proposed a potential taphonomic model, perhaps responsible for the high fidelity of preservation, for such microfossils permineralized in Precambrian rocks. The integrated approach has potential for deciphering the enigmatic nature of Mesoproterozoic microorganisms preserved in stromatolitic cherts, with significant implications for microbial preservation in the geological record.

SubtypeArticle
KeywordGaoyuzhuang Formation Microfossil Cyanobacteria Taphonomy Morphological Alteration Molecular Structure
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.precamres.2017.11.007
URL查看原文
Indexed BySCI
Language英语
WOS KeywordCARBONACEOUS-MATERIAL GEOTHERMOMETER ; INDIVIDUAL PRECAMBRIAN MICROFOSSILS ; RAMAN-SPECTRA ; FOSSIL RECORD ; SOUTH KAZAKSTAN ; NORTH-ISLAND ; NEW-ZEALAND ; APEX CHERT ; SILICIFICATION ; MICROORGANISMS
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000423651500007
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/5920
Collection深海科学研究部_深海地质与地球化学研究室
Corresponding AuthorPeng, Xiaotong(Chinese Acad Sci, Inst Deep Sea Sci & Engn, Deep Sea Sci Div, Sanya 572000, Peoples R China)
Affiliation1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Deep Sea Sci Div, Sanya 572000, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Cincinnati, Dept Geol, POB 210013, Cincinnati, OH 45221 USA
Recommended Citation
GB/T 7714
Guo, Zixiao,Peng, Xiaotong,Czaja, Andrew D.,et al. Cellular taphonomy of well-preserved Gaoyuzhuang microfossils: A window into the preservation of ancient cyanobacteria[J]. PRECAMBRIAN RESEARCH,2018,304:88-98.
APA Guo, Zixiao,Peng, Xiaotong,Czaja, Andrew D.,Chen, Shun,Ta, Kaiwen,&Peng, Xiaotong.(2018).Cellular taphonomy of well-preserved Gaoyuzhuang microfossils: A window into the preservation of ancient cyanobacteria.PRECAMBRIAN RESEARCH,304,88-98.
MLA Guo, Zixiao,et al."Cellular taphonomy of well-preserved Gaoyuzhuang microfossils: A window into the preservation of ancient cyanobacteria".PRECAMBRIAN RESEARCH 304(2018):88-98.
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