globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2533
论文题名:
Rock comminution as a source of hydrogen for subglacial ecosystems
作者: Telling J.; Boyd E.S.; Bone N.; Jones E.L.; Tranter M.; Macfarlane J.W.; Martin P.G.; Wadham J.L.; Lamarche-Gagnon G.; Skidmore M.L.; Hamilton T.L.; Hill E.; Jackson M.; Hodgson D.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:11
起始页码: 851
结束页码: 855
语种: 英语
Scopus关键词: biodiversity ; biogeochemical cycle ; comminution ; grain size ; hydrogen ; methanogenesis ; microbial ecology ; Proterozoic ; rock property ; source rock ; subglacial environment ; temperature effect ; Antarctica ; Arctic ; Canada ; Greenland ; Norway
英文摘要: Substantial parts of the beds of glaciers, ice sheets and ice caps are at the pressure melting point. The resulting water harbours diverse subglacial microbial ecosystems capable of affecting global biogeochemical cycles. Such subglacial habitats may have acted as refugia during Neoproterozoic glaciations. However, it is unclear how life in subglacial environments could be supported during glaciations lasting millions of years because energy from overridden organic carbon would become increasingly depleted. Here we investigate the potential for abiogenic H 2 produced during rock comminution to provide a continual source of energy to support subglacial life. We collected a range of silicate rocks representative of subglacial environments in Greenland, Canada, Norway and Antarctica and crushed them with a sledgehammer and ball mill to varying surface areas. Under an inert atmosphere in the laboratory, we added water, and measured H 2 production with time. H 2 was produced at 0°C in all silicate-water experiments, probably through the reaction of water with mineral surface silica radicals formed during rock comminution. H 2 production increased with increasing temperature or decreasing silicate rock grain size. Sufficient H 2 was produced to support previously measured rates of methanogenesis under a Greenland glacier. We conclude that abiogenic H 2 generation from glacial bedrock comminution could have supported life and biodiversity in subglacial refugia during past extended global glaciations. © 2015 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106148
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: School of Geographical Sciences, University of Bristol, University Road, Bristol, United Kingdom; Department of Microbiology and Immunology, Montana State University, Bozeman, MT, United States; Interface Analysis Centre, School of Physics, University of Bristol, 121 St Michael's Hill, Bristol, United Kingdom; Department of Earth Sciences, Montana State University, Bozeman, MT, United States; Department of Biological Sciences, University of Cincinnati, Cincinnati, OH, United States; Natural Resources Laboratory, Carl Zeiss Microscopy Ltd, 509 Coldhams Lane, Cambridge, United Kingdom; NorwegianWater Resources and Energy Direct., Hydrology Department, Glacier Snow and Ice Section, Oslo, Norway; British Antarctic Survey, Madingley Road, Cambridge, United Kingdom

Recommended Citation:
Telling J.,Boyd E.S.,Bone N.,et al. Rock comminution as a source of hydrogen for subglacial ecosystems[J]. Nature Geoscience,2015-01-01,8(11)
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