赣皖交界婺源地区中生代花岗岩体的锆石LA-ICP-MS U-Pb年龄及其地质意义
Geological Science and Technology Information(2014)
Abstract
邦彦坑岩体、段莘岩体和青山岭岩体位于江南造山带东段,是赣东北中生代花岗岩群的重要组成部分,然而它们的确切形成年龄仍不清楚.采用LA-ICP-MS技术测定了上述3个岩体的锆石U-Pb年龄.这些锆石的CL图像及Th/U比值均具岩浆成因特征;测试结果指示邦彦坑岩体并不是形成于晚青白口世,而是形成于晚侏罗世(约151 Ma),而段莘岩体和青山岭岩体形成于早白垩世(128~125 Ma).邦彦坑岩体和段莘、青山岭岩体可能分别为华南中生代晚期180~155 Ma和129~122Ma 2个岩石圈伸展事件的岩浆作用产物.
MoreKey words
Mesozoic granites,zircon LA-ICP-MS U-Pb dating,Jiangnan orogenic belt of Northeastern Jiangxi,lithospheric stretching tectonics
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