Process of crustal formation of the Rayner Complex, Enderby Land, East Antarctica

变质作用P-T轨迹与年代学的对应关系是探讨大陆形成演化的重要问题。东南极恩德比地是进行此项研究的适宜地区之一。本研究旨在重新审视恩德比地及其附近的地质框架。这一结果将制约前寒武纪超大陆的形成，特别是有望揭示中、晚元古代全球性造山运动--格伦维尔事件。主要结果如下：1）Rayner杂岩和Lutzow-Holm杂岩（LHC）具有相似的顺时针P-T轨迹的变质历史。2)Sor Ronaltist山脉的英云闪长岩和LHC的变质闪长花岗岩具有相似的年代学和地球化学特征。岩石成因解释为这些p.lutonic岩石的熔融热板转化为石榴角闪岩。3)通过对纳皮耶杂岩中含镁橄榄石和镁橄榄石共生体的详细岩相学研究，揭示了超高温变质作用的物理条件达到1000 ℃以上和7-8 kbar。此外，还发现了两期P-T轨迹，表明热深圳湾岩体侵入中地壳是热源。

The correspondence between metamorphic P-T path and geochronology is the most important issue on the discussion of the formation and evolution of continents. Enderby Land in East Antarctica is the one of the suitable areas for this study. This study aims re-examination of the geological framework in the Enderby Land and it's vicinity. The results would constrain the formation of the supercontinets in Precambrian, particularly it is expected to reveal the Grenvilian event, the world-wide orogeny in the middle to late Proterozoic. Following results have been obtained so far ; 1) The Rayner Complex and the Lutzow-Holm Complex (LHC) show similar metamorphic history of the clockwise retrograde P-T paths. 2) Tonalitic rocks in the Sor Rondane Mountains and metatrondjhemite in LHC have similar geochronological and geochemical characteristics. The petrogenesis for these p.lutonic rocks is interpreted by the melting of hot slabs which were transformed into garnet amphibolite. 3) Detailed petrographic study on the sapphirine-and osumilite-bearing paragenesis in the Napier Complex revealed that the physical condition of ultra-high temperature metamorphism reached more than 1000C and 7-8 kbar. Moreover, two-stage P-T paths were found, suggesting the intrusion of hot pluton into the middle crust as the heat source.