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。
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.
出处
《地质通报》
CAS
CSCD
北大核心
2006年第3期398-401,共4页
Geological Bulletin of China
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
作者简介
林清茶,(1977-),女,博士,从事岩石地球化学研究工作。E-mail:clchlin·163.com