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Helium and neon isotopic compositions in the ophiolites from the Yarlung Zangbo River,Southwestern China:The information from deep mantle

查看全文 作　　者：YE [1]XianRen;TAO [1]MingXin;YU [1]ChuanAo;ZHANG [2]MingJie 高影响力作者 机构地区：[1]Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;[2]Department of Geology,Lanzhou University,Lanzhou 730000,China高影响力机构 出　　处：《Science China Earth Sciences》索引2007年第50卷第6期,共12页高影响力期刊 基　　金：the National Natural Science Foundation of China (Grant Nos. 40573012 and 40273009);the West Light (the Talent Training Plans) of CAS 摘　　要：The ophiolites from the Yarlung Zangbo River (Tibet),Southwestern China,were analysed for the con-tents of helium and neon and their isotopic compositions by stepwise heating. The serpentinites from Bainang showed a high 3He/4He value of 32.66Ra (Ra is referred to the 3He/4He ratio in the present air) in 700 ℃ fraction. At lower temperature,all of the dolerites displayed as very high 3He/4He ratios as ones investigated for hotspots. It was clear that the high 3He/4He ratio was one of immanent characterics in the magma source formed the dolerites,suggesting that there was a large amount of deep mantle fluids in these rocks. In the three-isotope diagram of neon,the data points from the ophiolites of the Yarlung Zangbo River were arranged along the Loihi Line. This is in agreement with the characteristics of he-lium isotopes,revealing that the high-3He plume from deep mantle had played an important role in the formation of the Neo-Tethyan Ocean. The helium isotopic compositions in the basalts were far higher than atomospheric value but lower than the average value of MORB,although there were various de-grees of alteration. The possible reasons were that basaltic 关 键 词：Yarlung Zangbo RIVER (Tibet) OPHIOLITE HELIUM NEON isotope plume
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