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LA-ICPMS U-Pb Dating of Zircons in Dacite Porphyry at North Guidong Pluton in Nanling Mountain and Its Geological Significance
Pages: 268-273,262
Year: Issue:  5
Journal: Uranium Geology

Keyword:  Guidong plutondacite porphyryzircon U-Pb datingCaledonian period;
Abstract: 贵东岩体位于南岭大东山-贵东花岗岩带的东部地区,在岩体北部外围的上洞、河口及全南等地有英安斑岩出露,本文利用LA-ICPMS锆石U-Pb原位测年方法对采自上洞、河口等地的英安斑岩进行了年代测定,结果表明:英安斑岩的年龄为450.8 Ma,属加里东期岩浆作用产物.这与前人认为该岩体的形成时代为晚侏罗世(约145 Ma)有显著不同.
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