dc.contributor.author | Singh, Tanya | |
dc.contributor.author | Kshirsagar, P.R. | |
dc.contributor.author | Das, A. | |
dc.contributor.author | Yadav, K. | |
dc.contributor.author | Mallik, S. | |
dc.contributor.author | Mascarenhas-Pereira, M.B.L. | |
dc.contributor.author | Thomas, T.R.A. | |
dc.contributor.author | Mamatha, S.S. | |
dc.contributor.author | LokaBharathi, P.A. | |
dc.contributor.author | Khadge, N.H. | |
dc.contributor.author | Nath, B.N. | |
dc.contributor.author | Dhakephalkar, P.K. | |
dc.contributor.author | Iyer, S.D. | |
dc.contributor.author | Ray, D. | |
dc.contributor.author | Valsangkar, A.B. | |
dc.contributor.author | Garg, A. | |
dc.contributor.author | PrakashBabu, C. | |
dc.contributor.author | Waghole, R.J. | |
dc.contributor.author | Waghmare, S.S. | |
dc.contributor.author | Rajwade, J.M. | |
dc.contributor.author | Paknikar, K.M. | |
dc.date.accessioned | 2019/04/29 | |
dc.date.accessioned | 2019-04-30T12:48:27Z | |
dc.date.available | 2019/03/31 | |
dc.date.available | 2019-04-30T12:48:27Z | |
dc.date.issued | 2019 | |
dc.identifier.citation | Geochemistry, Geophysics, Geosystems, vol.20(2); 2019; 708-729 | |
dc.identifier.issn | 1525-2028 | |
dc.identifier.uri | https://doi.org/10.1029/2018GC007640 | |
dc.identifier.uri | http://drs.nio.org/drs/handle/2264/8153 | |
dc.description.abstract | Microbial 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.language | en | |
dc.publisher | John Wiley & Sons | |
dc.relation.isreferencedby | SCI | |
dc.title | Implications of Microbial Thiosulfate Utilization in Red Clay Sediments of the Central Indian Basin: The Martian Analogy | |
dc.type | Journal Article | |
dc.affiliation.author | CSIR-National Institute of Oceanography, Dona Paula, Goa, India | |