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Basalt and peridotite recovered from Murray Ridge: Are they of supra-subduction origin?
Burgath, K.-P.; von Rad, U.; van der Linden, W.; De Block, M.; Khan, A.A.; Roeser, H.A.; Weiss, W. (2002). Basalt and peridotite recovered from Murray Ridge: Are they of supra-subduction origin? Geol. Soc. Lond. Spec. publ. 195: 117-135
In: Hartley, A.J. et al. (Ed.) Geological Society Special Publication. Geological Society of London: Oxford; London; Edinburgh; Boston, Mass.; Carlton, Vic.. ISSN 0305-8719, more
Peer reviewed article  

Also published as
  • Burgath, K.-P.; von Rad, U.; van der Linden, W.; De Block, M.; Khan, A.A.; Roeser, H.A.; Weiss, W. (2002). Basalt and peridotite recovered from Murray Ridge: Are they of supra-subduction origin?, in: Clift, P.D. et al. The tectonic and climatic evolution of the Arabian Sea region. Geological Society Special Publication, 195: pp. 117-135, more

Available in Authors 

Keywords
    Basalts; Geochemistry; Mid-ocean ridges; Peridotite; Petrography; Subduction; ISW, Arabian Sea [Marine Regions]; Marine

Authors  Top 
  • Burgath, K.-P.
  • von Rad, U.
  • van der Linden, W., more
  • De Block, M., more
  • Khan, A.A.
  • Roeser, H.A.
  • Weiss, W.

Abstract
    Petrographic and geochemical data for new basalt and peridotite samples recovered from sampling sites at the Southern Murray Ridge help to constrain models for the evolution of the Owen-Murray Ridge system, which forms the northwestern boundary of the Indian plate. Trace elements immobile during alteration (Ti, Zr, Nb, Y and rare earth elements) suggest that the altered microphyric metabasalt has affinities to magmatism of active margins (island-arc tholeiite sensu lato). It is distinctly different from mid-ocean ridge basalt, back-arc-basin basalt, or intra-plate Deccan Trap basalt. The sampled serpentinized harzburgite or clinopyroxene-poor lherzolite was deformed under mantle conditions and is similar to the mantle section of nearby ophiolite sequences. This association of rocks suggests that an ophiolite mélange was sampled. However, results from sampling station 462 NIOP indicate that the Murray Ridge complex also contains igneous rocks with Deccan Trap affinity. For the emplacement of the island-arc tholeiite we assume an origin in a convergent supra-subduction setting, related to the closing of a Late Cretaceous Neo-Tethyan ocean basin between the Arabian and Indian plates to the south and the Eurasian plate to the north. Since Neogene time, the Murray Ridge-Dalrymple Trough has been underlain by attenuated (?)continental crust and characterized by extensional rift tectonics.

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