摘要
本文通过对肥东群变质岩的锆石单矿物 U—Pb 法同位素地质定年研究表明:肥东群的原岩形成时间为1994.68±<sub>95</sub><sup>102</sup>Ma,属于下元古代。该变质岩在688.33±<sub>32</sub><sup>30</sup>Ma 又遭受了一次热力事件,这与张八岭变质岩系最初变质作用发生的时间几乎是同期的。该区所经历的热力事件与晋宁运动的余波年龄相当。
The result of U-Pb isotopic dating of single zircon from metamorphic rocks of Feidong Group shows that the protolith of Feidong Group formed 1994,68±_(95)^(102) Ma ago,belonging to Lower Pro- terozoic.The metamorphic rocks were subjected to a thermal event about 688.33±_(32)^(30) Ma ago when the rocks of Zhangbaling Group were metamorphosed.The thermal event is equivalent to the latest Jinning Movement.
出处
《安徽地质》
1993年第3期22-25,共4页
Geology of Anhui
