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A Forearc(Guleman,Elazi?)Ophiolite:evidence from peridotite mineral geochemistry

Acta Geologica Sinica(English Edition) 2017年第S1期91卷 31-页

作者： Mustafa Eren RIZELI Melahat BEYARSLAN A.Feyzi BINGOL FiratUniversity Department of GeologicalEngineeringElazıgTurkey

The Guleman ophiolite,one of the most important ophiolitic massifs of the Southeast Anatolian Ophiolitic Belt,consists of a core of serpentinized mantle rocks overlain by an ultramafic sequence,layered and isotropic gabbro,and sheeted *** ophiolite structurally overlies the Lower Miocene Lice Formation and is overlain by young sandstones and shales of the Upper Maashtrichtian-Lower Eocene Hazar Complex and Middle Eocene Maden *** Guleman ophiolite tectonically overlain by Precambrian to Upper Triassic Bitlis metamorphic *** mantle peridotites compose mainly of fresh and in place serpentinized harzburgite tectonite with local bands and lenses of dunites with large-sized chromitite *** Guleman peridotites commonly show porphyroclastic texture,high-temperature fabrics such as kink-bands in *** to microprobe analyses,the harzburgite and dunite have low Ca O and Al2O3 abundance similar to Mariana forearc,and their average Cr-(=Cr/(Cr+Al)atomic)ratio of Cr-spinelsis surprisingly high(>0.63)besides Fo content of olivine is between 90.9 to 92.3 in *** to Mg#(Mg/(Mg+Fe2+))versus Cr#in spinel diagram,the degree of partial melting is higher than 35%and spinel values plot in the forearc peridotites *** Gulemanharzburgites have low Ca O,Al2O3 and Ti O2 contents in orthopyroxene and clinopyroxene lammelles,resembling those of depleted harzburgites from modern forearcs and different from moderately depleted abyssal ***,we propose that the Guleman peridotites form in a forearc setting during the subduction initiation that developed as a result of northward subduction of the southern branch of the Neo-Tethys in response to the convergence between Arabian and Anatolian plates.

关键词： A Forearc Guleman Elazi evidence from peridotite mineral geochemistry Ophiolite

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