| 琼中高级变质杂岩中单颗粒锆石Pb-Pb年龄及其地质意义 |
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| 引用本文：张业明,张仁杰,胡宁,张树淮,段其发.1999.琼中高级变质杂岩中单颗粒锆石Pb-Pb年龄及其地质意义[J].地球学报,20(3):284-288. |
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| 基金项目:国家自然基金 |
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| 中文摘要: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±13Ma和499±24Ma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。 |
| 中文关键词:高级变质杂岩 麻粒岩 紫苏花岗岩 锆石Pb-Pb法测年 琼中地区 |
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| High Grade Metamorphic Complexes in Middle Hainan Island: Ages of the Pb-Pb Single Zircons and Their Geological Significance |
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| Abstract: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. |
| keywords:high grade metamorphic complexes gneisses granulites charnockites single zircon Pb-Pb dating middle Hainan Island |
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