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dc.contributor.authorKadam, N.
dc.contributor.authorBadesab, F.K.
dc.contributor.authorLascu, I.
dc.contributor.authorWagner, C.L.
dc.contributor.authorGaikwad, Virsen
dc.contributor.authorSaha, A.
dc.contributor.authorSangode, S.
dc.contributor.authorVenkateshwarlu, M.
dc.date.accessioned2024-03-31
dc.date.accessioned2024-09-13T06:18:58Z
dc.date.available2024-02-28
dc.date.available2024-09-13T06:18:58Z
dc.date.issued2024
dc.identifier.citationCommunications Earth and Environment , vol.5(1); 2024; Article no: 107
dc.identifier.issn2662-4435
dc.identifier.otherhttps://www.nature.com/articles/s43247-024-01259-0
dc.identifier.urihttps://doi.org/10.1038/s43247-024-01259-0
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9251
dc.descriptionIF(JCR2023) = 7.9
dc.description.abstractUnusually large and enigmatic giant magnetofossils are well-documented in sediments deposited during and surrounding climatic events such as the Paleocene-Eocene Thermal Maximum (~56?Ma) and Middle Eocene Climatic Optimum (~40?Ma). However, the absence of giant magnetofossil modern analogues raises intriguing questions about their origin and formation mechanism. In this study, we report the discovery of giant magnetofossils within late Quaternary sediments retrieved from the Bay of Bengal (BoB), the youngest giant magnetofossils yet reported. First-order reversal curve diagrams of BoB sediments display a central ridge feature, a characteristic magnetic signature of non-interacting single domain magnetofossils. Scanning electron microscopy examinations reveal giant magnetofossils with needle, spindle, bullet, and spearhead shapes. We use high-resolution transmission electron microscopy, with electron diffraction and energy dispersive spectrometry, to confirm their distinctive morphologies and magnetite crystal structure. Our environmental magnetic and geochemical data suggest that an influx of fluvially derived reactive iron and organic carbon, combined with persistent suboxic conditions, supported the proliferation of giant magnetofossil-producing organisms. The discovery of a modern analogue to ancient giant magnetofossils expands our understanding of their temporal distribution within the geological record and is a promising step toward elucidating the nature of the organisms responsible for their formation. Magnetic and electron microscopy analyses of sediments from offshore southeast India identify the youngest examples of giant magnetofossils yet found, which may represent a modern analogue for ancient giant magnetofossils from past hyperthermal events.
dc.languageen
dc.publisherNature Publishing Group
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.titleDiscovery of late Quaternary giant magnetofossils in the Bay of Bengal
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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