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| Content Provider | Springer Nature Link |
|---|---|
| Author | Parnell, John Brolly, Conr Spinks, Sam Bowden, Stephen |
| Copyright Year | 2015 |
| Abstract | The interaction of microbes and metals is widely assumed to have occurred in surface or very shallow subsurface environments. However new evidence suggests that much microbial activity occurs in the deep subsurface. Fluvial, lacustrine and aeolian ‘red beds’ contain widespread centimetre-scale reduction spheroids in which a pale reduced spheroid in otherwise red rocks contains a metalliferous core. Most of the reduction of Fe (III) in sediments is caused by Fe (III) reducing bacteria. They have the potential to reduce a range of metals and metalloids, including V, Cu, Mo, U and Se, by substituting them for Fe (III) as electron acceptors, which are all elements common in reduction spheroids. The spheroidal morphology indicates that they were formed at depth, after compaction, which is consistent with a microbial formation. Given that the consequences of Fe (III) reduction have a visual expression, they are potential biosignatures during exploration of the terrestrial and extraterrestrial geological record. There is debate about the energy available from Fe (III) reduction on Mars, but the abundance of iron in Martian soils makes it one of the most valuable prospects for life there. Entrapment of the microbes themselves as fossils is possible, but a more realistic target during the exploration of Mars would be the colour contrasts reflecting selective reduction or oxidation. This can be achieved by analysing quartz grains across a reduction spheroid using Raman spectroscopy, which demonstrates its suitability for life detection in subsurface environments. Microbial action is the most suitable explanation for the formation of reduction spheroids and may act as metalliferous biosignatures for deep subsurface microbial activity. |
| Starting Page | 107 |
| Ending Page | 118 |
| Page Count | 12 |
| File Format | |
| ISSN | 01696149 |
| Journal | Origins of Life and Evolution of Biospheres |
| Volume Number | 46 |
| Issue Number | 1 |
| e-ISSN | 15730875 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2015-09-16 |
| Publisher Place | Dordrecht |
| Access Restriction | Subscribed |
| Subject Keyword | Deep subsurface Deep biosphere Reduction spheroid Iron-reducing bacteria Metalliferous biosignature Selenium Raman spectroscopy Life Sciences Astrophysics and Astroparticles Earth Sciences Astronomy, Observations and Techniques Biochemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Ecology, Evolution, Behavior and Systematics Space and Planetary Science |
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