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dc.contributor.authorSingh, Tanya
dc.contributor.authorKshirsagar, P.R.
dc.contributor.authorDas, A.
dc.contributor.authorYadav, K.
dc.contributor.authorMallik, S.
dc.contributor.authorMascarenhas-Pereira, M.B.L.
dc.contributor.authorThomas, T.R.A.
dc.contributor.authorMamatha, S.S.
dc.contributor.authorLokaBharathi, P.A.
dc.contributor.authorKhadge, N.H.
dc.contributor.authorNath, B.N.
dc.contributor.authorDhakephalkar, P.K.
dc.contributor.authorIyer, S.D.
dc.contributor.authorRay, D.
dc.contributor.authorValsangkar, A.B.
dc.contributor.authorGarg, A.
dc.contributor.authorPrakashBabu, C.
dc.contributor.authorWaghole, R.J.
dc.contributor.authorWaghmare, S.S.
dc.contributor.authorRajwade, J.M.
dc.contributor.authorPaknikar, K.M.
dc.date.accessioned2019/04/29
dc.date.accessioned2019-04-30T12:48:27Z
dc.date.available2019/03/31
dc.date.available2019-04-30T12:48:27Z
dc.date.issued2019
dc.identifier.citationGeochemistry, Geophysics, Geosystems, vol.20(2); 2019; 708-729
dc.identifier.issn1525-2028
dc.identifier.urihttps://doi.org/10.1029/2018GC007640
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/8153
dc.description.abstractMicrobial thiosulfate utilization and S-disproportionation could be important mechanisms of sulfate-formations on Earth and Mars. Sulfates on Mars date back to late-Noachian to Hesperian period. In contrast, the large sulfur/sulfate formations on Earth evolved under different chronological sequences. The S-cycle was provoked intermittently, permitting multiple appearances of the S-oxidizers on an evolutionary timescale. Hydrothermally altered deep-oceanic red clay sediments of the Central Indian Basin were examined as potential analogue for sulfur (S) oxidation on Mars. The basin sediments supported an active microbial S-metabolism that exhibited S-disproportionation coupled to microbial carbon-fixation through intermediate processes like thiosulfate utilization. Sulfur-oxidizers/thiotrophic denitrifiers were isolated in large numbers at circum-neutral pH, from these cold and dark abyssal Fe-oxide dominated organic-C starved clay. Experimental simulations under psychrophilic and thermo-tolerant conditions revealed the coexistence of an anaerobic, thermal component under the predominantly oxic, circum-neutral seafloor conditions. Multiple causative factors like hydrothermal seafloor circulation, in situ volcanism, and fracture zone reactivation could drive the widespread S-cycle activity in the Central Indian Basin, albeit at a low scale. It is postulated that these conditions are analogous to Great Oxidation Event situations on Earth, when S-oxidizers evolved and flourished. Experimental studies on microbial thiosulfate flux are few in spite of intense scientific interest in microbial S-disproportionation. To the best of our knowledge, this is a new report on regression model development for microbial thiosulfate flux. These clay-systems and their component microbes could serve as analogue to the ancient well-hydrated Noachian Mars and throw light on planetary hydration and desiccation mechanisms
dc.languageen
dc.publisherJohn Wiley & Sons
dc.relation.isreferencedbySCI
dc.titleImplications of Microbial Thiosulfate Utilization in Red Clay Sediments of the Central Indian Basin: The Martian Analogy
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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