摘要
琼中地区存在由片麻岩、混合岩、麻粒岩和紫苏花岗岩组成的高级变质杂岩。对其中片麻岩和麻粒岩开展了单颗粒锆石 Ｐｂ － Ｐｂ 年代学研究，分别获得１４８３ ±１３ Ｍａ 和４９９ ±２４ Ｍａ 的年龄数据。结合现有地质资料， 认为琼中地区先后经历了新太古代表壳岩系形成、中元古代变质—岩浆再造和加里期构造热事件改造等３ 个主要演化阶段。
The high grade metamorphic complexes in middle Hainan Island are composed of gneisses, migmatites, granulites and charnockites.Having Studied Pb_Pb dating of single zircons from gneisses and granulites,the authors hold that the complexes were transfomed by two Mesoproterozoic and Caledonian tectonic events.Based on geological analysis,it is suggested that the basement in middle Hainan Island has experienced three important evolutional stages, i.e.the formation of Neoarchean supercrust rocks, the Mesoproterozoic metamorphic_magmatic reformation and the transformation by the Caledonian tectonic event.
基金
国家自然基金
关键词
高级变质杂岩
麻粒岩
紫苏花岗岩
铅-铅测年
high grade metamorphic complexes gneisses granulites charnockites single zircon Pb-Pb dating middle Hainan Island
