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山东新泰孟家屯岩组锆石特征及其年代学意义
引用本文:杜利林,庄育勋,杨崇辉,万渝生,王新社,王世进,张连峰.山东新泰孟家屯岩组锆石特征及其年代学意义[J].地质学报,2003,77(3):359-366.
作者姓名:杜利林  庄育勋  杨崇辉  万渝生  王新社  王世进  张连峰
作者单位:1. 中国地质科学院地质研究所,北京,100037
2. 中国地质调查局,北京,100035
3. 山东省地质调查院,济南,250013
4. 山东省地质科学实验研究院,济南,250013
基金项目:地质矿产部跨世纪人才基金,同位素开放实验室基金
摘    要:本文借助于离子探针技术(SHRIMPⅠ),对孟家屯岩组的石榴子石石英岩、含十字石石榴黑云母片岩、斜长角闪岩,以及孟家屯岩组的围岩条带状黑云斜长片麻岩(原岩为英云闪长岩)等进行了锆石年代学测定,并结合阴极发光和背散射电子图像反映出的锆石形态和微区特征,得出不同锆石微区的年龄。经分析有几组年龄值,分别为:2742Ma和2717Ma,2695Ma,2642~2620Ma。结合笔者其他的研究分析,它们分别代表孟家屯岩组源区岩石年龄、英云闪长岩的侵入年龄、变质作用年龄。在此基础上,较为完整的论述了孟家屯岩组演化历史。本文的同位素年代学资料为鲁西孟家屯岩组最新的资料,尤其是首次获得了孟家屯岩组准确的源区岩石年龄,并且准确地限定了孟家屯岩组的形成时代。对研究孟家屯岩组,以及泰山岩群和整个鲁西的地质演化历史有重要的意义。

关 键 词:山东新泰  孟家屯岩组  锆石  特征  年代学  源区岩石年龄  地质演化
修稿时间:2002年12月23

Characters of Zircons in the Mengjiatun Formation in Xintai of Shandong and Their Chronological Significance
DU Lilin,ZHUANG Yuxun,YANG Chonghui,WAN Yusheng,WANG XinsheWANG Shijin,ZHANG Lianfeng Institute of Geology,CAGS,Beijing,China Geology Survey,Beijing,Geological Survey of Shandong,Ji''nan,Shandong Geological Academy,Ji''nan.Characters of Zircons in the Mengjiatun Formation in Xintai of Shandong and Their Chronological Significance[J].Acta Geologica Sinica,2003,77(3):359-366.
Authors:DU Lilin  ZHUANG Yuxun  YANG Chonghui  WAN Yusheng  WANG XinsheWANG Shijin  ZHANG Lianfeng Institute of Geology  CAGS  Beijing  China Geology Survey  Beijing  Geological Survey of Shandong  Ji'nan  Shandong Geological Academy  Ji'nan
Abstract:Zircons in the garnet quartzite, staurolite-bearing garnet-biotite schist, amphibolite, and banded biotite plagiogneiss are dated by means of SHRIM n , and the shape and micro-texture of the zircons observed with CL and BSE. Ages of 2742 Ma, 2717 Ma, 2695 Ma, and 2642 - 2620 Ma are obtained in different micro-regions of the minerals. These ages are the age of the protolith of the Mengjiatun Formation, eruption age of tonalite, and age of the main metamorphic stage. The evolution of the Mengjiatun Formation is reconstructed. The most important result is the age of the protolith, which confines the sedimentation age of the Mengjiatun Formation. These results are significant in studying the Mengjiatun Formation, Taishan Group, and the geological evolution of western Shandong.
Keywords:SHRIMP II  Mengjiatun Formation  zircon  age  protolith  geochronology  
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