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对扬子板块西缘泸定—石棉地区黄草山花岗岩体和康定地区下索子花岗岩体中自形锆石 ,采用2 0 5Pb - 2 35U混合同位素稀释法测定了锆石U Pb年龄。测试结果表明 ,黄草山岩体中锆石结晶年龄为 786± 36Ma ,下索子岩体中锆石结晶年龄为 80 5± 15Ma ,表明它们都是晋宁期岩浆活动产物。
The U Pb ages of zircons were determined by the mixed isotope dilution method of 205Pb - 2 35U on the Huangcao Mountain granite body in the Luding - Shimian area of the Yangtze plate and the authigenic zircon in the Xiaxuszi granite body in the Kangding area. The test results show that the crystallization age of zircon in Huangcaoshan Mountain is 786 ± 36Ma and that of the Lower Paleozoic is 805 ± 15Ma, indicating that they are all magmatic activities of Jinning Period.