Ultrastructural and geochemical characterization of archean-paleoproterozoic graphite particles: Implications for recognizing traces of life in highly metamorphosed rocks
Schiffbauer, James D.; Yin, Leiming (尹磊明); Bodnar, Robert J.; Kaufman, Alan J.; Meng, Fanwei (孟凡巍); Hu, Jie; Shen, Bing; Yuan, Xunlai (袁训来); Bao, Huiming; Xiao, Shuhai
2007-08-01
发表期刊ASTROBIOLOGY
ISSN1531-1074
卷号7期号:4页码:684-704
摘要

Abundant graphite particles occur in amphibolite-grade quartzite of the Archean-Paleoproterozoic Wutai Metamorphic Complex in the Wutaishan area of North China. Petrographic thin section observations suggest that the graphite particles occur within and between quartzite clasts and are heterogeneous in origin. Using HF maceration techniques, the Wutai graphite particles were extracted for further investigation. Laser Raman spectroscopic analysis of a population of extracted graphite discs indicated that they experienced a maximum metamorphic temperature of 513 +/- 50 C, which is consistent with the metamorphic grade of the host rock and supports their indigenicity. Scanning and transmission electron microscopy revealed that the particles bear morphological features ( such as hexagonal sheets of graphite crystals) related to metamorphism and crystal growth, but a small fraction of them ( graphite discs) are characterized by a circular morphology, distinct marginal concentric folds, surficial wrinkles, and complex nanostructures. Ion microprobe analysis of individual graphite discs showed that their carbon isotope compositions range from -7.4% to -35.9% V-PDB ( Vienna Pee Dee Belemnite), with an average of -20.3%, which is comparable to bulk analysis of extracted carbonaceous material. The range of their size, ultrastructures, and isotopic signatures suggests that the morphology and geochemistry of the Wutai graphite discs were overprinted by metamorphism and their ultimate carbon source probably had diverse origins that included abiotic processes. We considered both biotic and abiotic origins of the carbon source and graphite disc morphologies and cannot falsify the possibility that some circular graphite discs characterized by marginal folds and surficial wrinkles represent deflated, compressed, and subsequently graphitized organic-walled vesicles. Together with reports by other authors of acanthomorphic acritarchs from greenschist-amphibolite-grade metamorphic rocks, this study suggests that it is worthwhile to examine carbonaceous materials preserved in highly metamorphosed rocks for possible evidence of ancient life.

DOI10.1089/ast.2006.0098
语种英语
关键词[WOS]North China Craton ; Granulite-facies Graphite ; Isua Supracrustal Belt ; Carbonaceous Material ; Western-australia ; Warrawoona Group ; Shanxi Province ; Orogenic Belt ; Wutai Complex ; South-africa
WOS研究方向Astronomy & Astrophysics ; Life Sciences & Biomedicine - Other Topics ; Geology
WOS类目Astronomy & Astrophysics ; Biology ; Geosciences, Multidisciplinary
WOS记录号WOS:000249144300009
出版者MARY ANN LIEBERT INC
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/24
专题中国科学院南京地质古生物研究所
其他
通讯作者Schiffbauer, James D.
作者单位1.Virginia Polytech Inst & State Univ, Dept Geosci, Blacksburg, VA 24061 USA
2.Nanjing Inst Geol & Paleontol, Nanjing, Peoples R China
3.Univ Maryland, Dept Geol, College Pk, MD 20742 USA
4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeontol & Stratigraphy, Nanjing, Peoples R China
5.Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA
推荐引用方式
GB/T 7714
Schiffbauer, James D.,Yin, Leiming ,Bodnar, Robert J.,et al. Ultrastructural and geochemical characterization of archean-paleoproterozoic graphite particles: Implications for recognizing traces of life in highly metamorphosed rocks[J]. ASTROBIOLOGY,2007,7(4):684-704.
APA Schiffbauer, James D..,Yin, Leiming .,Bodnar, Robert J..,Kaufman, Alan J..,Meng, Fanwei .,...&Xiao, Shuhai.(2007).Ultrastructural and geochemical characterization of archean-paleoproterozoic graphite particles: Implications for recognizing traces of life in highly metamorphosed rocks.ASTROBIOLOGY,7(4),684-704.
MLA Schiffbauer, James D.,et al."Ultrastructural and geochemical characterization of archean-paleoproterozoic graphite particles: Implications for recognizing traces of life in highly metamorphosed rocks".ASTROBIOLOGY 7.4(2007):684-704.
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