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The H-2/CH4 ratio during serpentinization cannot reliably identify biological signatures
Huang, Ruifang; Sun, Weidong; Liu, Jinzhong; Ding, Xing; Peng, Shaobang; Zhan, Wenhuan; Huang, RF; Sun, WD (reprint author), Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China.; Huang, RF (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.
2016
Source PublicationSCIENTIFIC REPORTS
Volume6Pages:33821
AbstractSerpentinization potentially contributes to the origin and evolution of life during early history of the Earth. Serpentinization produces molecular hydrogen (H-2) that can be utilized by microorganisms to gain metabolic energy. Methane can be formed through reactions between molecular hydrogen and oxidized carbon (e.g., carbon dioxide) or through biotic processes. A simple criterion, the H-2/CH4 ratio, has been proposed to differentiate abiotic from biotic methane, with values approximately larger than 40 for abiotic methane and values of <40 for biotic methane. The definition of the criterion was based on two serpentinization experiments at 200 degrees C and 0.3 kbar. However, it is not clear whether the criterion is applicable at a wider range of temperatures. In this study, we performed sixteen experiments at 311-500 degrees C and 3.0 kbar using natural ground peridotite. Our results demonstrate that the H-2/CH4 ratios strongly depend on temperature. At 311 degrees C and 3.0 kbar, the H-2/CH4 ratios ranged from 58 to 2,120, much greater than the critical value of 40. By contrast, at 400-500 degrees C, the H-2/CH4 ratios were much lower, ranging from 0.1 to 8.2. The results of this study suggest that the H-2/CH4 ratios cannot reliably discriminate abiotic from biotic methane.
Department[Huang, Ruifang; Sun, Weidong] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China; [Huang, Ruifang; Zhan, Wenhuan] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Liu, Jinzhong] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China; [Ding, Xing] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China; [Peng, Shaobang] Zhongshan Res Inst Environm Protect, Zhongshan 528400, Peoples R China ; 边缘海地质
Subject AreaScience & Technology - Other Topics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15319
Collection中科院边缘海地质重点实验室
Corresponding AuthorHuang, RF; Sun, WD (reprint author), Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China.; Huang, RF (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.
Recommended Citation
GB/T 7714
Huang, Ruifang,Sun, Weidong,Liu, Jinzhong,et al. The H-2/CH4 ratio during serpentinization cannot reliably identify biological signatures[J]. SCIENTIFIC REPORTS,2016,6:33821.
APA Huang, Ruifang.,Sun, Weidong.,Liu, Jinzhong.,Ding, Xing.,Peng, Shaobang.,...&Huang, RF .(2016).The H-2/CH4 ratio during serpentinization cannot reliably identify biological signatures.SCIENTIFIC REPORTS,6,33821.
MLA Huang, Ruifang,et al."The H-2/CH4 ratio during serpentinization cannot reliably identify biological signatures".SCIENTIFIC REPORTS 6(2016):33821.
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