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滇中苍山群和苴林群的变质作用演化与地球化学研究
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摘要
滇中地区位于扬子、华夏和印支三大块体的结合部位。对该区元古代基底
    岩群的变质作用和地球化学进行综合研究,不仅对于搞清元古代成矿作用机制
    和矿产资源的合理利用具有重要的经济意义,而且对于正确认识地球化学急变
    带的形成机制和确定华南块体在Rodinia古陆中的位置均具有重要的理论意义
    和科学价值。
     通过矿物生长顺序、变质温压条件、石榴石生长环带和~39Ar-~40Ar定年研究,
    作者在直林群中十字石-蓝晶石等变带内获得了具有逆时针方向演化的P-T-t轨
    迹。该轨迹的进变质阶段与岛弧地区的岩浆增生过程密切相关,指示元谋地区
    在中-新元古代期间(1.0~0.85 Ga)存在岛弧构造环境;峰期之后的近等压冷却
    退变轨迹表明该地区未经历强烈的剥蚀,并可能有深部热流的持续供给。前人
    和作者对哀牢山-苍山群变质条件的研究表明该变质带内至少存在两期变质作
    用的叠加:早期为中压型,晚期为低压型。
     元素地球化学研究表明,在苍山群和直林群中均存在两类变基性岩:一类
    为形成于P-MORB环境的变拉斑玄武岩;另一类为形成于板内拉张背景的变
    碱性玄武质岩墙。Nd-Sr-Pb 同位素体系特征进一步表明,变碱性玄武质岩墙
    形成于中-新元古代,其源区为 DMM与 EMⅡ端员的混合,反映板块俯冲作用
    的影响;变拉斑玄武岩形成于古-中元古代,其源区在苍山群为 DMM与 EMⅡ
    端员的混合,而在直林群为 DMM与 EMⅠ端员的混合,暗示在中元古之前二
    者分属不同的地球化学块体。
     扬子块体西缘元古代基底的对比研究表明该区的变质基底主要形成于古-
    中元古代(2.0~1.6 Ga),但可能分属不同的块体;中-新元古代(1.0~0.8 Ga)的
    构造活动可能与Rodinia超级古陆的拼贴和裂解过程密切相关。
Systematic studies on metamorphism and geochemistry of the Proterozoic
    basements in Central Yunnan in the conjunct area among the Yangtze, Cathaysia and
    Indochina Blocks are very important not only for interpreting the mechanism of the
    Proterozoic mineralization and using mineral resources but also for understanding
    the formation of geochemical steep zones and affirming the location of the South
    China Block within the Neoproterozoic Rodinia supercontinent.
    Based on the comprehensive studies of the mineral growth sequence, P-T
    conditions of metamorphism, garnet growth zoning and ~39Ar-~40Ar dating, a cunter-
    clockwise P-T-t path has been reconstructed for a staurolite-kyanite isograde belt in
    the Julin Group. The prograde path was related to the magmatic accretion in arc
    settings, indicating the existence of an arc setting during the Mesoproterozoic-
    Neoproterozoic period. The retrograde near-isobaric cooling path after the peak
    metamorphism reveals that rapid erosion did not occur and sustained heat supplies
    from the upper-mantle were maintained after magmatic accretion in the Yuanmou
    area. The metamorphic conditions estimated by the author, together with the
    published P-T data for the Ailao Shan-Cang Shan Groups show that al least two
    episodes of metamorphism occurred in this area, i.e., the early episode is the
    medium-pressure type, and the late episode is low-pressure type.
    The elemental geochemistry shows that two types of metabasites occurred in the
    Cangshan and Julin Groups. One is the meta-tholeiite formed in a transitional P-
    MORB and arc tectonic environment, and the other is the meta-alkali basaltic dyke
    formed in a within-plate extension environment. The characteristics of the Nd-Sr-Pb
    
    
    
    isotope system further indicate that the meta-alkali basaltic dykes were originat6d
    from a mantle source mixed between two end-members of DMM and EM II sources,
    indicating that their source was reworked by subduction in the Mesoproterozoic-
    Neoproterozoic time; and the meta-tholeiites resulted from a mantle source, fOrmed
    by mixing between the DMM and EM lI end-members for the Cangshan GrouP but the
    DMM and EM l for the Julin Group in the P a l eo protero zo ic -MesoprotCrozo ic period,
    indicating that the two Gruops respectively belonged to the different blocks before
    the Mesoproterozoic time.
    The comparative studies of the Proterozoic basements in the westem margin of
    the YangtZe block show that the metamorphic basements were mainly formed during
    the Mesoproterozoic-Neoproterozoic period (2.0 ~ l.6 Ga) but might belong to
    differeni blocks; the tectonic activities during the Mesoproterozoic-Neoproterozic
    interval (l.0 ~ 0.8 Ga) may be related to the assembly and breakup of the Rodinia
    suPercoatinent.
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