• 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.

    Magma genesis at Andaman volcanic arc regime, Northeastern Indian Ocean: Role of slab-mantle interaction

    Thumbnail
    View/Open
    Episod_43_323a.pdf (2.043Mb)
    Date
    2020
    Author
    Saha, A.
    Mudholkar, A.V.
    KameshRaju, K.A.
    Metadata
    Show full item record
    Abstract
    This study reports new petrological and geochemical data of submarine volcanic rocks dredged from the Andaman arc, northeastern Indian Ocean and evaluates their petrogenetic and tectonic implications. The studied samples exhibit wide range of compositions including basalts, andesites, dacites and rhyolites depicting BADR trend of magmatic differentiation. The basalts are porphyritic and composed of calcic plagioclase phenocrysts embedded in the groundmass consisting of plagioclase, clinopyroxene and volcanic glass. Andesite and dacites comprise clusters of plagioclase are phenocrysts embedded in glassy ground mass depicting glomeroporphyritic and vitrophyric textures. Plagioclase microlites in andesites show primary flow texture. Rhyolites from the study area porphyritic in nature predominantly consisting K-feldspar, quartz and plagioclase phenocrysts embedded in a silica rich merocrystalline groundmass of quartz, K-feldspar, biotite, opaque and glass. Plagioclase compositions in basalts and rhyolites correspond to An76-78 and An5-8 respectively. Geochemical and tectonic attributes marked by uniform LILE-LREE enriched, HFSE depleted trends corroborate (i) Mariana-type subduction of old, cold, thick and dense Indian Ocean lithosphere (ii) slabdehydration, variable slab-mantle interaction, metasomatism and flux melting of mantle wedge and (iii) magma underplating and melting of lower oceanic crust resulting into calc-alkaline magmatism of B-A-D-R compositional spectra
    URI
    http://www.episodes.org/journal/view.html?doi=10.18814/epiiugs/2020/020019
    http://drs.nio.org/drs/handle/2264/8540
    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