• Login
    View Item 
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Large-scale mass wasting on the miocene continental margin of Western India

    Thumbnail
    View/Open
    9511.pdf (2.842Mb)
    Date
    2020
    Author
    Dailey, S.K.
    Clift, P.D.
    Kulhanek, D.K.
    Blusztajn, J.
    Routledge, C.M.
    Calves, G.
    OSullivan, P.
    Jonell, T.N.
    Pandey, D.K.
    Ando, S.
    Coletti, G.
    Zhou, P.
    Li, Y.
    Neubeck, N.E.
    Bendle, J.A.P.
    Aharonovich, S.
    Griffith, E.M.
    Gurumurthy, G.P.
    Hahn, A.
    Iwai, M.
    Khim, B.K.
    AnilKumar
    GaneshKumar, A.
    Liddy, H.M.
    Lu, H.
    Lyle, M.W.
    Mishra, R.
    Radhakrishna, T.
    Saraswat, R.
    Saxena, R.
    Scardia, G.
    Sharma, G.K.
    Singh, A.D.
    Steinke, S.
    Suzuki, K.
    Tauxe, L.
    Tiwari, M.
    Xu, Z.
    Yu, Z.
    Metadata
    Show full item record
    Abstract
    A giant mass-transport complex was recently discovered in the eastern Arabian Sea, exceeding in volume all but one other known complex on passive margins worldwide. The complex, named the Nataraja Slide, was drilled by International Ocean Discovery Program (IODP) Expedition 355 in two locations where it is ~300 m (Site U1456) and ~200 m thick (Site U1457). The top of this mass-transport complex is defined by the presence of both reworked microfossil assemblages and deformation structures, such as folding and faulting. The deposit consists of two main phases of mass wasting, each consisting of smaller pulses, with generally fining-upward cycles, all emplaced just prior to 10.8 Ma based on biostratigraphy. The base of the deposit at each site is composed largely of matrix-supported carbonate breccia that is interpreted as the product of debris-flows. In the first phase, these breccias alternate with wellsorted calcarenites deposited from a high-energy current, coherent limestone blocks that are derived directly from the Indian continental margin, and a few clastic mudstone beds. In the second phase, at the top of the deposit, muddy turbidites dominate and become increasingly more siliciclastic. At Site U1456, where both phases are seen, a 20-m section of hemipelagic mudstone is present, overlain by a ~40-m-thick section of calcarenite and slumped interbedded mud and siltstone. Bulk sediment geochemistry, heavy-mineral analysis, clay mineralogy, isotope geochemistry, and detrital zircon U-Pb ages constrain the provenance of the clastic, muddy material to being reworked, Indus-derived sediment, with input from western Indian rivers (e.g., Narmada and Tapti rivers), and some material from the Deccan Traps. The carbonate blocks found within the breccias are shallow-water limestones from the outer western Indian continental shelf, which was oversteepened from enhanced clastic sediment delivery during the mid-Miocene. The final emplacement of the material was likely related to seismicity as there are modern intraplate earthquakes close to the source of the slide. Although we hypothesize that this area is at low risk for future mass wasting events, it should be noted that other oversteepened continental margins around the world could be at risk for mass failure as large as the Nataraja Slide.
    URI
    https://doi.org/10.1130/B35158.1
    http://drs.nio.org/drs/handle/2264/8495
    Collections
    • Scholarly literature [9074]

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV
     

     

    Browse

    All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV