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    Rock magnetic evidence of tectonic control on the sedimentation and diagenesis in the Andaman Sea over ~1 million years

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    Date
    2021
    Author
    Badesab, F.K.
    Mascarenhas-Pereira, M.B.L.
    Gaikwad, V.
    Dewangan, P.
    Panda, P.P.
    Deenadayalan, K.
    Salunke, K.
    Augastian, B.
    Patil, J.R.
    Lakshmi, B.V.
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    Abstract
    We 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.
    URI
    https://doi.org/10.1016/j.marpetgeo.2021.105150
    https://drs-beta.nio.org/drs/handle/2264/8673
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