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The role of prokaryotes in supergene alteration of submarine hydrothermal sulfides

Record type: Article

We combine mineralogical, stable isotope and organic biomarker data to understand the role of prokaryote activity in supergene reactions within submarine hydrothermal sulfidic sediments. Data are presented for two adjacent cores from the periphery of the inactive Alvin hydrothermal mound. The limit of oxygenated seawater penetration into the sulfidic sediments is expressed as a sharp peak in solid phase Cu (atacamite and secondary Cu sulfides) associated with supergene alteration of the sulfide pile. Total prokaryote numbers are low throughout the upper few metres of sediment relative to published data for deep-sea sites. However, there is a statistically significant enrichment of prokaryote numbers at the redox front that coincides with abundant Fe oxide filaments and a unique distribution of microbial biomarkers. The dominance of quaternary-branched alkanes in the oxidized transition zone immediately above the redox front (and their absence below) suggests a significant role of the source organisms in iron or sulfide oxidation under the more circumneutral conditions associated with the redox transition zone. The morphology of the Fe oxide filaments preserved within late stage silica and gypsum mineralization is consistent with a biogenic origin of the filaments. Gypsum sulfur isotopes are in equilibrium with fluids that are derived from quantitative sulfide oxidation and gypsum nucleation is inferred to be biologically induced. These new data suggest that supergene alteration of sulfidic sediments generates sharp redox and pH gradients that stimulate prokaryotic activity, in particular iron and sulfide oxidisers, which in turn govern the distribution of secondary mineral phases and the abundance of redox sensitive trace metals.

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Citation

Glynn, S., Mills, R.A., Palmer, M.R., Pancost, R.D., Severmann, S. and Boyce, A.J. (2006) The role of prokaryotes in supergene alteration of submarine hydrothermal sulfides Earth and Planetary Science Letters, 244, (1-2), pp. 170-185. (doi:10.1016/j.epsl.2006.01.065).

More information

Submitted date: 1 September 2005
Published date: 15 March 2006
Keywords: seafloor hydrothermal deposits, supergene alteration, biomineralisation, Fe-oxidation

Identifiers

Local EPrints ID: 27803
URI: http://eprints.soton.ac.uk/id/eprint/27803
ISSN: 0012-821X
PURE UUID: 5dd8e857-995c-409b-a5b4-a21bab5d2cd1
ORCID for R.A. Mills: ORCID iD orcid.org/0000-0002-9811-246X

Catalogue record

Date deposited: 28 Apr 2006
Last modified: 17 Jul 2017 16:03

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Contributors

Author: S. Glynn
Author: R.A. Mills ORCID iD
Author: M.R. Palmer
Author: R.D. Pancost
Author: S. Severmann
Author: A.J. Boyce

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