滇西鹤庆地区六合透辉石正长斑岩锆石SHRIMP U-Pb年龄及其意义  

Zircon SHRIMP U-Pb age of diopside syenite-porphyry at Liuhe,Heqing,western Yunnan,China

作　　者：夏斌[1] 耿庆荣[1] 张玉泉[1] 

机构地区：[1]中国科学院广州地球化学研究所边缘海地质重点实验室,广东广州510640

出　　处：《地质通报》2007年第6期692-697,共6页Geological Bulletin of China

基　　金：国家自然科学基金重点项目(编号:40534019);中国科学院知识创新工程重要方向项目(编号:KZCX2-SW-117)资助

摘　　要：鹤庆县六合透辉石正长斑岩中的锆石有2种成因类型:一是岩浆锆石,二是具有老核新壳的岩浆复合锆石。用锆石SHRIMP U-Pb定年法,测定了岩浆锆石和岩浆复合锆石的新壳2部分,其年龄为37.8Ma±1.1Ma,属于喜马拉雅早期,相当于早渐新世。结合前人的资料,对斑岩的属性、源区及岩浆复合锆石的老核等问题进行了探讨。Zircons from diopside syemte-porphyry at Liuhe, Heqing, western Yunnan, have two genetic types： magmatic zircons and inherited zircons with old cores and new growth zones, SHRIMP U-Pb zircon dating of the magmatic zircons and the new growth zones of the inherited zircons shows that the age of the rock is 37.8±1.1 Ma, indicating an early Himalayan age, which corresponds to the early Oligocene. According to the age data, combined with the previous study, the attributes and source of the porphyry and the old cores of the magmatic inherited zircons with growth zones are discussed.

关 键 词：锆石SHRIMP U—Pb年龄 透辉石正长斑岩 滇西鹤庆地区 

分 类 号：P588.133[天文地球—岩石学] P597.3[天文地球—地质学]