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冲绳海槽火山岩中岩浆包裹体及气体同位素组成研究
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摘要
本文首次对冲绳海槽的浮岩和玄武岩中矿物的包裹体进行了系统的
    分析研究。工作主要包括:包裹体的均一与爆裂温度测量,化学成分与
    气相组分分析,热解释放气体分析,碳、氢、氦、氖同位素分析等。据
    此探讨了岩浆的起源及演化过程、不同火山岩之间的成因联系、岩浆作
    用与热液活动的关系等。
     (1)斜长石中的包裹体至少有两个捕获期,分别对应斜长石的两个
    结晶阶段。斜长石是贯穿岩浆作用始终的结晶相,其包裹体记录了岩浆
    物源与结晶演化过程。
     (2)玄武岩与浮岩中包裹体的化学成分与气相组分具有同系列岩浆演
    化的相关性与继承性,二者同时具有N_2、CO等幔源组分,碳、氢同位素
    组成具有幔源特征,说明玄武岩和浮岩具有共同的地幔来源,分别代表岩
    浆作用早期和结晶分异作用晚期的产物。
     (3)岩浆中富气富水,气相组分的碳、氢、氦同位素组成具有俯冲
    板块脱失流体的特征。俯冲板块脱失流体的混入可能发生在岩浆作用
    早期,或者说俯冲板块脱失流体对地幔熔融产生岩浆起了重要作用。
     (4)岩浆中的挥发性组分不仅是导致地幔熔融产生岩浆的“催化
    剂”,而且是岩浆结晶演化及形成分层岩浆房的主要控制因素之一。
     (5)冲绳海槽的岩浆作用不仅为现代海底热液活动提供了热源,而
    且有气液相的物质供应。
The inclusions hosted in the phenocrysts of basalt and pumice in the
     Okinawa Trough was systematically studied in this thesis for the first time.
     The homogeneous temperature, decrepitation temperature, major element
     compositions and volatile components of the inclusions were determined.
     Meanwhile, the content of volatile components in whole-rock and their
     carbon, hydrogen, helium and neon isotopic compositions of the same
     samples were also analyzed. Based on the obtained data, the magma genesis,
     magma evolution process, relations in the petrogenesis of different kinds of
     volcanic rocks, and effects of magmatism on the hydrothermal activity were
     discussed.
    
     (1) The inclusions hosted in plagioclase were trapped at two periods at
     least, which respectively corresponded to the two stages of crystallization of
     plagioclase. Plagioclase was the mineral crystallized throughout the whole
     magmatic process. So, the inclusions hosted in plagioclase have recorded the
     information of magma source and magma evolution.
    
     (2) The major element compositions of inclusions hosted in basalt and
     pumice samples were correlated and inheritance in the same evolution series.
     The presents of the components N2 and CO generally originated from the
     mantle and the mantle-sourced characteristics of carbon, hydrogen isotopic
     compositions suggest that basalt and pumice were cognate and respectively
     represented the products at early stage of magmatism and at the late stage of
     crystal fractionation.
    
    
    
    
     /
    
    
    
    
    
    
    
    
    
     (3) The magma in the trough was rich in H20 and other volatile
     components. The carbon, hydrogen and helium isotopic compositions of
     volatile components displayed the characteristics of the fluid dehydrated from
     subducting slab. Therefore, the fluid dehydrated from subducting slab should
     have been added to magma at its forming stage or play an important role in
     the melting of mantle.
    
     (4) The volatile component was not only the 揷atalyzer?of melting of
     the mantle to form initial magma but also one of the main factors to control
     the trend of magma evolution and the formation of zoned magma chamber
     under the trough.
    
     (5) The magmatism in the Okinawa Trough contributed a lot to the
     hydrothermal activity not only as heat source but also as material source.
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