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Raman spectroscopy and structural heterogeneity of carbonaceous material in Proterozoic organic-walled microfossils in the North China Craton
Pang, Ke (庞科)1,2,3,4; Tang, Qing (唐卿)3; Wu, Chengxi (吴承羲)1,2,4; Li, Guangjin1,2,5; Chen, Lei (陈雷)5; Wan, Bin (万斌)1,2,4; Yuan, Xunlai (袁训来)1,2,4; Bodnar, Robert J.3; Xiao, Shuhai3
2020-08-15
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume346Pages:15
Abstract

Raman spectroscopy is a minimally intrusive and minimally destructive technique that has played an important role in analyzing Precambrian carbonaceous microfossils and microstructures. Previous studies have shown that heterogeneities in structural order of carbonaceous material (CM) as revealed by Raman spectroscopy can be preserved in Proterozoic silicified cyanobacterial fossils. However, such heterogeneities have not been documented in Proterozoic eukaryotic microfossils preserved as carbonaceous compressions. In this study, we used Raman spectroscopy to investigate the structural characteristics of organic-walled microfossils, including eukaryotes preserved as carbonaceous compressions, from the late Paleoproterozoic Ruyang Group and the early Neoproterozoic (Tonian) Liulaobei Formation in the North China Craton. Raman geothermometers indicate that CM experienced low-grade metamorphism with apparent peak metamorphic temperatures of similar to 200 degrees C for both the Ruyang and Liulaobei microfossils. Heterogeneities in structural characteristics of CM in eukaryotic microfossils were found among different subcellular structures of Shuiyousphaeridium macroreticulatum and among different taxa from the same stratigraphic horizon. We suggest that these heterogeneities can be attributed to differences in precursor organic compounds; thus, the importance of organic precursors should be considered in CM Raman geothermometry studies, especially in environments where heating events occurred quickly. The Raman data presented here are also consistent with hypotheses that the Ruyang microfossils Dictyosphaera delicata and S. macroreticulatum are biologically conspecific taxa with their vesicle walls having similar CM Raman features, and that the Liulaobei microfossils Leiosphaeridia jacutica and L. tenuissima are distinct taxa despite their similarities in morphologies other than vesicle wall thickness. Although more data are needed to verify the consistency of interspecies, intraspecies, and intraspecimen variability, this study indicates that Raman spectroscopy may have the potential to provide an independent test of early eukaryote taxonomy, which has been traditionally based only on morphological features, and to reveal heterogeneities of CM of early eukaryotic organisms.

KeywordRaman spectroscopy Carbonaceous material Organic-walled microfossils Proterozoic Ruyang Group Liulaobei Formation
DOI10.1016/j.precamres.2020.105818
Indexed BySCI
Language英语
WOS KeywordNEOPROTEROZOIC LIULAOBEI FORMATION ; MESOPROTEROZOIC RUYANG GROUP ; APEX CHERT ; MATERIAL GEOTHERMOMETER ; MICRO-SPECTROSCOPY ; GRAPHITE FORMATION ; SOUTHERN MARGIN ; HUAINAN REGION ; ACRITARCHS ; FOSSILS
Funding ProjectNational Natural Science Foundation of China[41602007] ; National Natural Science Foundation of China[41921002] ; Chinese Academy of Sciences[QYZDJ-SSW-DQC009] ; Chinese Academy of Sciences[XDB26000000] ; Chinese Academy of Sciences[XDB18000000] ; National Key Research and Development Program of China[2017YFC0603101] ; State Key Laboratory of Palaeobiology and Stratigraphy[20201102] ; State Key Laboratory of Palaeobiology and Stratigraphy[193126] ; Natural Science Foundation of Jiangsu Province of China[BK20161090]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000561242000012
Funding OrganizationNational Natural Science Foundation of China ; Chinese Academy of Sciences ; National Key Research and Development Program of China ; State Key Laboratory of Palaeobiology and Stratigraphy ; Natural Science Foundation of Jiangsu Province of China
PublisherELSEVIER
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/32184
Collection中国科学院南京地质古生物研究所
Corresponding AuthorPang, Ke (庞科); Xiao, Shuhai
Affiliation1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Peoples R China
3.Virginia Tech, Dept Geosci, Blacksburg, VA 24061 USA
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Peoples R China
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Pang, Ke ,Tang, Qing ,Wu, Chengxi ,et al. Raman spectroscopy and structural heterogeneity of carbonaceous material in Proterozoic organic-walled microfossils in the North China Craton[J]. PRECAMBRIAN RESEARCH,2020,346:15.
APA Pang, Ke .,Tang, Qing .,Wu, Chengxi .,Li, Guangjin.,Chen, Lei .,...&Xiao, Shuhai.(2020).Raman spectroscopy and structural heterogeneity of carbonaceous material in Proterozoic organic-walled microfossils in the North China Craton.PRECAMBRIAN RESEARCH,346,15.
MLA Pang, Ke ,et al."Raman spectroscopy and structural heterogeneity of carbonaceous material in Proterozoic organic-walled microfossils in the North China Craton".PRECAMBRIAN RESEARCH 346(2020):15.
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