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petrogenesis of triassic mafic complexes with morb/oib affinities from the western garzê-Litang Ophiolitic Mélange, Central Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2017年第S1期91卷 19-20页

作者： MA Changqian LIU Bin GAO Ke HE Zuoxiang State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China Faculty of Earth Sciences China University of GeosciencesWuhan 430074China School of Geosciences Yangtze UniversityWuhan 430100China

There is a general consensus that most ophiolites formed above subduction zones(Pearce,2003),particularly during forearc extension at subduction initiation(Shervais,2001;Stern,2004;Whattam and Stern,2011).'Supra-Subduction zone'(SSZ)ophiolites such as the well-studied Tethyan ophiolites,generally display a characteristic sequential evolution from mid-oceanic ridge basalts(morbs)to island arc tholeiities(IATs)or bonites(BONs)(Pearce,2003;Dilek and Furnes,2009,2011),which were generated in sequence from the decompression melting of asthenospheric mantle and partial melting of subduction-metasomatized depleted mantle(Stern and Bloomer,1992;Dilek and Furnes,2009;Whattam and Stern,2011).However,ophiolites with morb and/or oceanic-island basalt(oib)affinities are rare,and their origin and tectonic nature are poorly understood(Boedo et al.,2013;Saccani et al.,2013).It is interesting that the composition of these ophiolites from the central Tibetan Plateau(CTP)is dominated by morbs and minor oibs and a distinct lack of IATs and BONs,which is inconsistent with most ophiolites worldwide(Robinson and Zhou,2008;Zhang et al.,2008).But the generation and tectonic nature of these ophiolites are still controversial.*In this study,we present new geochronological,mineralogical and Sr-Nd isotopic data for the Chayong and Xiewu mafic complexes in the western garzê-Litang suture zone(GLS),a typical Paleo-Tethyan suture crossing the CTP(Fig.1).The triassic ophiolite in the western GLS has been described by Li et al.(2009),who foundthat it mainly consists of gabbros,diabases,pillow basalts and a few metamorphic *** ophiolite has been tectonically dismembered and crops out in triassic clastic rocks and limestones as tectonic *** Chayong and Xiewu mafic complexes are generally regarded as important fragments of the triassic ophiolites(e.g.,Jin,2006;Li et al.,2009).Zircon LA-ICP-MS U-Pb ages of234±3 Ma and 236±2 Ma can be interpreted as formation times of the Chayong and X

关键词： oib Central Tibetan Plateau Litang Ophiolitic M petrogenesis of triassic mafic complexes with morb/oib affinities from the western garz lange

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