【摘要】 鲁西地区泰山岩群雁翎关组为华北克拉通新太古代典型花岗绿岩带的重要组成部分,形成时代大于2.6Ga。对其中变质砾岩中的一花岗质砾石进行了锆石SHRIMP定年,(2632±18)Ma年龄为砾石所代表的花岗质岩石的形成时代,表明雁翎关变质砾岩中至少部分砾石为构造成因。该砾石可解释为花岗岩脉经构造变形而形成。结合前人研究成果,对泰山岩群形成时代和绿岩带基底岩石特征进行了探讨。更多还原

【Abstract】 Yanlingguan Formation of Taishan Group Complex in western Shandong is an important part of the Neoarchean typical granite-greenstone belt in North China Craton,with an formation age of > 2.6 Ga.Zircons from one granitic gravel sample of the metaconglomerate were chosen for SHRIMP U-Pb dating,and an age of(2632± 18)Ma is interpreted as the formation age of the granitic rocks of gravel,which suggests that at least part of gravels in the metaconglomerate were of tectonic origin.And the gravel might be formed from granite dikes through structural deformation.Combined with previous researches,we discussed the formation age of the Taishan Group and the petrologic characteristics of the basement rocks in the greenstone belt.更多还原