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dc.contributor.authorBadesab, F.K.
dc.contributor.authorMascarenhas-Pereira, M.B.L.
dc.contributor.authorGaikwad, V.
dc.contributor.authorDewangan, P.
dc.contributor.authorPanda, P.P.
dc.contributor.authorDeenadayalan, K.
dc.contributor.authorSalunke, K.
dc.contributor.authorAugastian, B.
dc.contributor.authorPatil, J.R.
dc.contributor.authorLakshmi, B.V.
dc.date.accessioned2021-06-16
dc.date.accessioned2021-06-22T10:09:06Z
dc.date.available2021-06-13
dc.date.available2021-06-22T10:09:06Z
dc.date.issued2021
dc.identifier.citationMarine and Petroleum Geology, vol.130; 2021; Article no: 105150
dc.identifier.issn0264-8172
dc.identifier.otherhttps://www.sciencedirect.com/science/article/pii/S0264817221002531
dc.identifier.urihttps://doi.org/10.1016/j.marpetgeo.2021.105150
dc.identifier.urihttps://drs-beta.nio.org/drs/handle/2264/8673
dc.descriptionIF2019 - 3.79
dc.description.abstractWe evaluate the sedimentary (magnetic, mineralogical, geochemical, grain size) records of a long sediment core (NGHP-01-17 A) to elucidate the tectonic control on the sedimentation and diagenesis in the Andaman Sea (AS) over the past ~ 1 Ma. Two distinct sedimentary magnetic zones (Z-I and Z-II) are identified based on the rock magnetic signatures. A significant shift in the depositional environment is observed around ~90 ka which is marked by a rapid change in magnetite susceptibility (?lf), Fe, Ti and organic carbon content in Z-I. A trend of upward increase in ?lf from ~90 ka to 3 ka in core NGHP-01-17 A suggest increase in detrital flux to the AS and represents the onset of a new sedimentary regime following most recent event of tectonic uplift in Indo-Burman Ranges (IBR) which occurred at ~ 150 ka. Methane influenced progressive diagenetic dissolution of detrital iron oxides and subsequent precipitation of iron sulfides in Z-II is clearly evident in the rock magnetic and mineralogical data. Multiple bands of diagenetically formed iron sulfide nodules at different periods in Z-II indicate episodic intensification of anaerobic oxidation of methane (AOM) due to enhanced methane-flux. We propose that fluid migration forced by tectonic processes facilitated episodic release of methane from deep reservoir that led to the formation of iron-sulfide nodules in the AS.
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.titleRock magnetic evidence of tectonic control on the sedimentation and diagenesis in the Andaman Sea over ~1 million years
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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