Rock comminution as a source of hydrogen for subglacial ecosystems

J. Telling, E. S. Boyd, N. Bone, E. L. Jones, M. Tranter, J. W. Macfarlane, P. G. Martin, J. L. Wadham, G. Lamarche-Gagnon, M. L. Skidmore, T. L. Hamilton, E. Hill, M. Jackson, D. A. Hodgson

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)851-855
Number of pages5
JournalNature Geoscience
Volume8
Issue number11
DOIs
StatePublished - Oct 29 2015

Bibliographical note

Funding Information:
The authors acknowledge financial support from an E.U. INTERACT Transnational Access grant (to J.T.), NASA Exobiology and Evolutionary Biology programme (NNX10AT31G to M.L.S. and E.S.B.) and the NASA Astrobiology Institute (NNA15BB02A to E.S.B.).

Fingerprint Dive into the research topics of 'Rock comminution as a source of hydrogen for subglacial ecosystems'. Together they form a unique fingerprint.

Cite this