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川南德昌地区茨达碱性岩锆石SHRIMP U-Pb定年
Zircon SHRIMP U-Pb dating of the Cida alkali complex in the Dechang area, southern Sichuan, China. Geological Bulletin of China,
【摘要】 对产于攀西古裂谷带内的德昌地区茨达碱性杂岩体中的碱长石英正长岩和钠铁闪石碱性花岗岩进行了锆石SHRIMP U-Pb年龄测定,年龄结果分别为221Ma±6Ma和225Ma±2Ma,表明该碱性岩的结晶年龄或成岩年龄相当于晚三叠世,同时暗示攀西古裂谷的张裂时间为三叠纪。
【Abstract】 Zircon SHRIMP U-Pb dating was performed on alkali feldspar-quartz syenite and arfvedsonite alkali granite in the Cida alkali complex in the Dechang area, in the Panxi paleorift. It gave ages of 221±6 Ma and 225±2 Ma respectively, which suggests that the crystallization or rock-forming age of the alkali complex is Late Triassic and also implies that extension-fracturing of the Panxi paleorift occurred in the Triassic.
【关键词】 SHRIMP年龄;
锆石;
碱长石英正长岩;
碱性花岗岩;
攀西古裂谷;
川南;
【Key words】 SHRIMP age; zircon; alkali feldspar-quartz syenite; alkali granite; Panxi paleorift; southern Sichuan;
【Key words】 SHRIMP age; zircon; alkali feldspar-quartz syenite; alkali granite; Panxi paleorift; southern Sichuan;
【基金】 中国科学院知识创新工程重要方向项目(KZCX2-SW-117)国家自然科学基金项目(40072022)资助
- 【文献出处】 地质通报 ,Geological Bulletin of China , 编辑部邮箱 ,2006年03期
- 【分类号】P588.15;P597.3
- 【被引频次】15
- 【下载频次】223