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Microbial endolithic colonization and the geochemical environment in young seafloor basalts

Cockell, C. S.; van Calsteren, Peter; Mosselmans, J. Fred W.; Franchi, Ian A.; Gilmour, Iain; Kelly, Laura; Olsson-Francis, Karen and Johnson, Diane (2010). Microbial endolithic colonization and the geochemical environment in young seafloor basalts. Chemical geology, 279(1-2) pp. 17–30.

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The colonization and weathering of young seafloor basaltic glass from the mid-Atlantic Ridge was examined. Microorganisms were localised to fractures in the surface of the basalt and grew on the surfaces of material in the fractures. XAS. Raman spectroscopy and NanoSIMS analysis of the fracture-filling material shows that it contains non-crystallised iron-enriched altered glass and poorly ordered iron oxides. Organisms, which in places develop into contiguous biofilms, develop on the surface of the material. No putative biogenic alteration textures were observed in the basaltic glass at the fracture boundaries suggesting that the microbial community is restricted to the secondary alteration products. Microbial culturing shows the presence of heterotrophic bacteria including Sufitobacter and Halomonas consistent with observations of photic zone detritus associated with fracture-filling material. These data show that the interior of fresh basaltic glass is an endolithic habitat for microorganisms, but that the glass itself is not a primary source of cations or energy for the developing communities.

Item Type: Journal Article
Copyright Holders: 2010 Elsevier B.V.
ISSN: 0009-2541
Extra Information: Additional contributors "the JC24 Shipboard scientific party"
Keywords: basaltic glass; endoliths; palagonite; Mid-Atlantic Rift; bacteria
Academic Unit/Department: Science > Physical Sciences
Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 27498
Depositing User: Ian Franchi
Date Deposited: 27 Jan 2011 15:29
Last Modified: 18 Jan 2016 09:56
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