大别-苏鲁地体超高压变质岩中的副矿物——锆石  

Zircon from UHP metamorphic rocks in the Dabie-Sulu terrane, China

作　　者：刘福来[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037

出　　处：《地质通报》2007年第9期1101-1122,共22页Geological Bulletin of China

基　　金：国家重点基础研究发展规划项目(编号:2003CB716502);国家自然科学基金重大项目(编号:40399143)资助。

摘　　要：激光拉曼和锆石阴极发光图像研究结果表明,大别-苏鲁强退变质岩石(包括正片麻岩、副片麻岩、斜长角闪岩、含蓝晶石石英岩、大理岩、云母片岩等)的锆石中,均保存以柯石英为代表的超高压矿物包裹体,且记录了十分一致的超高压变质温压条件:T=732～866℃,p=2.8～4.0GPa,表明大别-苏鲁地体曾发生过巨量物质深俯冲-超高压变质的壮观的地质事件。Laser Raman spectroscopy and cathodoluminescence images reveal that inclusions of UHP minerals represented by coesite occur in zoned zircons from strongly retrograded metamorphic rocks in Dabie-Sulu UHP terrane, including orthogneiss, paragneiss, amphibolite, kyanite-bearing quartzite, impure marble and mica schist, and that they all record very uniform temperature-pressure conditions of UHP metamorphism： T=732-866℃ and p=2.8-4,0 GPa. The common occurrence of UHP mineral inclusions in zircons of eclogite and its country rocks in the Dabie-Sulu terrane suggests that voluminous continental materials were subducted to the mantle depth （〉120 km） and experienced UHP metamorphism.

关 键 词：锆石 超高压矿物包裹体 巨量物质深俯冲 大别-苏鲁地体 

分 类 号：P588.34[天文地球—岩石学] P578.941[天文地球—地质学]