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dc.contributor.authorBadesab, F.K.
dc.contributor.authorGaikwad, V.
dc.contributor.authorVenkateshwarlu, M.
dc.contributor.authorKadam, N.
dc.date.accessioned2023-04-12
dc.date.accessioned2023-07-17T15:32:53Z
dc.date.available2023-03-09
dc.date.available2023-07-17T15:32:53Z
dc.date.issued2023
dc.identifier.citationMarine and Petroleum Geology, vol.151; 2023; Article no: 106212
dc.identifier.issn0264-8172
dc.identifier.otherhttps://linkinghub.elsevier.com/retrieve/pii/S0264817223001186
dc.identifier.urihttps://doi.org/10.1016/J.MARPETGEO.2023.106212
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9054
dc.description5.361
dc.description.abstractWe report a new mechanism of authigenic greigite and magnetite formation and preservation in an anomalous �sulfide-rich� interval in the cold (methane) seep sediments from the Bay of Bengal. Rock magnetic proxies (SIRM/?lf, ARM/SIRM) coupled with microscopic (TEM, SEM) observations provided compelling evidence for the presence of nanoscale authigenic magnetite and greigite particles in the methanic sediments. Multiple peaks of SIRM/?lf coupled with high Hcr (>53 mT) and DJH values suggest significant contribution from authigenic greigite particles to the bulk sediment magnetism. High ARM/SIRM in the sulfide-rich intervals within methanic zone suggest that nanoscale authigenic magnetite formation is closely linked with the microbial iron reduction process fuelled by anaerobic oxidation of methane (AOM). We proposed that enrichment of reactive secondary iron (oxyhydr) oxides through selective leaching of Fe2+ during diagenetic dissolution and maghemitization of detrital magnetic particles and iron-sulfide mineral oxidation at the paleo-SMTZ fronts, hindered the pyritization processes and favoured microbial iron reduction which led to the formation and preservation of authigenic greigite and magnetite in methanic sediments
dc.languageen
dc.publisherElsevier
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleGenesis and preservation of authigenic magnetite and greigite in the cold seep sediments, Bay of Bengal
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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