鲁西地区新太古界雁翎关组中花岗质“砾石”SHRIMP锆石U-Pb定年及地质意义  

SHRIMP zircon dating of granitic gravel from Neoarchean Yanlingguan Formation in western Shandong and its geological significance

作　　者：杨恩秀[1] 陶有兵[1] 张新平 朱继托[1] 万渝生[3] 王世进[1] 

机构地区：[1]山东省地质调查院,山东济南250013 [2]山东省第四地质矿产勘查院,山东潍坊261021 [3]中国地质科学院地质研究所,北京100037

出　　处：《地球化学》2008年第5期481-487,共7页Geochimica

基　　金：国家自然科学基金(40672127);中国地质调查局1∶25万淄博市幅区域地质调查项目(200113000026)

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。Yanlingguan Formation of Taishan Group Complex in western Shandong is an important part of the Neoarehean typical granite-greenstone belt in North China Craton, with an formation age of 〉 2. 6 Ga. Zircons from one granitic gravel sample of the metaeonglomerate 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 metaeonglomerate 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.

关 键 词：新太古代 变质砾岩 花岗质砾石 雁翎关组 

分 类 号：P597[天文地球—地球化学] P581[天文地球—地质学]