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Reduction spots in the Mesoproterozoic age: implications for life in the early terrestrial record

Published online by Cambridge University Press:  19 August 2010

Samuel C. Spinks ,
John Parnell  and
Stephen A. Bowden
Samuel C. Spinks*
Affiliation:
Department of Geology & Petroleum Geology, Meston Building, University of Aberdeen, Kings College, Aberdeen, Scotland AB24 3UE, UK
John Parnell
Affiliation:
Department of Geology & Petroleum Geology, Meston Building, University of Aberdeen, Kings College, Aberdeen, Scotland AB24 3UE, UK
Stephen A. Bowden
Affiliation:
Department of Geology & Petroleum Geology, Meston Building, University of Aberdeen, Kings College, Aberdeen, Scotland AB24 3UE, UK
*
e-mail: [email protected]
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Abstract

Reduction spots are common within continental red beds in the geological record. The method of formation of reduction spots is a subject of debate, but they are thought to be the result of the reducing nature of microbial life present in the sediment during burial, which caused localized reduction in sediment that was otherwise oxidized during diagenesis. Reduction spots often have dark concretionary cores commonly enriched in elements such as vanadium and uranium. This enrichment is also believed to be associated with the microbial reduction of the sediment. Isotopic data from sulphides present in the cores of analogue Triassic reduction spots are consistent with a potential microbial formation mechanism.

Here we report the presence of reduction spots with vanadium-rich mica (roscoelite) – enriched cores within a terrestrial red bed sequence of the Mesoproterozoic age. These findings may be a possible indicator of life within the terrestrial geological record during the Mesoproterozoic age, a time when such evidence is otherwise very rare. These findings suggest that life had not only colonized terrestrial environments during the Mesoproterozoic age, but had established a deep biosphere in the sediment.

Keywords

deep biosphereMesoproterozoic agemicrobial sulphate reductionreduction spotsred beds
Type
Research Article
Information
International Journal of Astrobiology , Volume 9 , Special Issue 4: Special issue Papers from the Astrobiology Society of Britain Conference 2010 , October 2010 , pp. 209 - 216
Copyright
Copyright © Cambridge University Press 2010

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