Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1718063115 |
SIMS analyses of the oldest known assemblage of microfossils document their taxon-correlated carbon isotope compositions | |
Schopf, J. William1,2,3,4; Kitajima, Kouki4; Spicuzza, Michael J.4; Kudryavtsev, Anatoliy B.2; Valley, John W.4 | |
2018-01-02 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:1页码:53-58 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Analyses by secondary ion mass spectroscopy (SIMS) of 11 specimens of five taxa of prokaryotic filamentous kerogenous cellular microfossils permineralized in a petrographic thin section of the similar to 3,465Ma Apex chert of northwestern Western Australia, prepared from the same rock sample from which this earliest known assemblage of cellular fossils was described more than two decades ago, show their delta C-13 compositions to vary systematically taxon to taxon from -31 parts per thousand to -39 parts per thousand. These morphospecies-correlated carbon isotope compositions confirm the biogenicity of the Apex fossils and validate their morphology-based taxonomic assignments. Perhaps most significantly, the delta C-13 values of each of the five taxa are lower than those of bulk samples of Apex kerogen (-27 parts per thousand), those of SIMS-measured fossil-associated dispersed particulate kerogen (-27.6 parts per thousand), and those typical of modern prokaryotic phototrophs (-25 +/- 10 parts per thousand). The SIMS data for the two highest delta C-13 Apex taxa are consistent with those of extant phototrophic bacteria; those for a somewhat lower delta C-13 taxon, with nonbacterial methane-producing Archaea; and those for the two lowest delta C-13 taxa, with methane-metabolizing gamma-proteobacteria. Although the existence of both methanogens and methanotrophs has been inferred from bulk analyses of the carbon isotopic compositions of pre-2,500 Ma kerogens, these in situ SIMS analyses of individual microfossils present data interpretable as evidencing the cellular preservation of such microorganisms and are consistent with the near-basal position of the Archaea in rRNA phylogenies. |
英文关键词 | Apex chert Archaea Archean methanogen methanotrophs |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000419128700026 |
WOS关键词 | PILBARA CRATON ; APEX CHERT ; GA ; SEQUENCE ; CRENOTHRIX ; SIGNATURES ; ORGANISMS ; BACTERIA ; PROPOSAL |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204868 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA; 2.Univ Calif Los Angeles, Ctr Study Evolut & Origin Life, Los Angeles, CA 90095 USA; 3.Univ Calif Los Angeles, Mol Biol Inst, Los Angeles, CA 90095 USA; 4.Univ Wisconsin, Dept Geosci, Wisconsin Astrobiol Res Consortium, Madison, WI 53706 USA |
推荐引用方式 GB/T 7714 | Schopf, J. William,Kitajima, Kouki,Spicuzza, Michael J.,et al. SIMS analyses of the oldest known assemblage of microfossils document their taxon-correlated carbon isotope compositions[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(1):53-58. |
APA | Schopf, J. William,Kitajima, Kouki,Spicuzza, Michael J.,Kudryavtsev, Anatoliy B.,&Valley, John W..(2018).SIMS analyses of the oldest known assemblage of microfossils document their taxon-correlated carbon isotope compositions.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(1),53-58. |
MLA | Schopf, J. William,et al."SIMS analyses of the oldest known assemblage of microfossils document their taxon-correlated carbon isotope compositions".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.1(2018):53-58. |
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