【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。更多还原

【Abstract】 Zircons from diopside syenite-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 Hi- malayan 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.更多还原