江苏东海县磨山片麻状碱性花岗岩锆石SHRIMP定年研究
Acta Geologica Sinica（2008）
Abstract
对东海县磨山片麻状碱性花岗岩中变质锆石和变质复合锆石进行SHRIMP U-Pb定年:①对变质锆石和变质复合锆石的新壳共测定8个点,其206Pb/238U加权平均年龄为212±3.6 Ma(MSWD=7.55),反映了磨山片麻状碱性花岗岩的变质时间,即成岩时间,属于印支期,相当于晚三叠世;②变质复合锆石的老核(继承锆石),多为发育有规则韵律环带的岩浆碎屑锆石,对其中3个颗粒进行了测定,U-Pb年龄分别为866 Ma、378 Ma和370Ma,暗示其来源是异地多时代的.同时还表明其寄主岩的原岩应是沉积岩,其时代不会早于晚古生代.
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Key words
Donghai County,Gneissic alkali granite,Jiangsu Province,Moshan,SHRIMP U-Pb age and its geology importation,Zircon
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