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吉林南部通化地区古元古代辽吉花岗岩的侵位年代与形成构造背景
引用本文:路孝平,吴福元,张艳斌,赵成弼,郭春丽.吉林南部通化地区古元古代辽吉花岗岩的侵位年代与形成构造背景[J].岩石学报,2004,20(3):381-392.
作者姓名:路孝平  吴福元  张艳斌  赵成弼  郭春丽
作者单位:1. 吉林大学地球科学学院,长春,130061;吉林省区域地质矿产调查所,长春,130062
2. 中国科学院地质与地球物理研究所,北京,100029
3. 吉林省区域地质矿产调查所,长春,130062
4. 吉林大学地球科学学院,长春,130061
基金项目:国家自然科学基金(40272045),中国科学院“百人计划”资助
摘    要:辽吉南部古元古代花岗岩极为发育,其中最著名的是具有条痕状构造的正长花岗岩,俗称辽吉花岗岩。因该花岗岩具有条带状、条痕状和似层状构造特征,而被前人认为是由太古宙或元古宙沉积地层经变质变形作用形成,或是交代成因的混合岩。本文通过对分布于吉林南部通化地区辽吉花岗岩的典型代表一钱桌沟岩体的详实野外地质填图及地球化学研究,确定该岩体属岩浆成因的“A”型花岗岩,其岩浆侵位年龄为2160Ma左右。结合目前获得的该区古元古代地层的碎屑锆石年龄,本文认为辽吉花岗岩是辽吉地区古元古代地层沉积的基底岩石,是地层沉积之前地壳拉张作用的结果,属于一种非造山型花岗岩。

关 键 词:成因类型  侵位年代  A型花岗岩  古元古代  通化地区  吉林南部
文章编号:1000-0569/2004/020(03)-0381-92
修稿时间:2003年4月23日

Emplacement age and tectonic setting of the Paleoproterozoic Liaoji granites in Tonghua area, southern Jilin province
LU XiaoPing,WU FuYu,ZHANG YanBin,ZHA ChengBi,GU ChunLi College of Earth Scicnces,Jilin University,Changchun,China Rngional Geological and Mineral Resources Survey of Jilin Province,Changchun,China Institute of Geology and Geophysics,Chinese Academy of Scicnces,Beijing,China.Emplacement age and tectonic setting of the Paleoproterozoic Liaoji granites in Tonghua area, southern Jilin province[J].Acta Petrologica Sinica,2004,20(3):381-392.
Authors:LU XiaoPing  WU FuYu  ZHANG YanBin  ZHA ChengBi  GU ChunLi College of Earth Scicnces  Jilin University  Changchun  China Rngional Geological and Mineral Resources Survey of Jilin Province  Changchun  China Institute of Geology and Geophysics  Chinese Academy of Scicnces  Beijing  China
Abstract:Paleoproterozoic granites are widely distributed in southern Liaoning and Jilin Provinces. The most well-known is the streak-like syenogranites which was called "Jiaoji Granites", in the Chinese literatures. It was thought before that this kind of granites either came from the Archean or Paleoproterozoic strata by metamorphism and deformation, or was migmatite by metasomatism. As a typical example of above granites, the Qianzhuogou pluton, located in Tonghua, southern Jilin Province, is chosen for a detailed field mapping and geochemical study in this paper. It is shown petrologically and geochemically that this pluton is A-type granite with emplacement age of about 2160 Ma. Combined with the ages of the detrial zircons in the Paleoproterozoic strata, it was suggested that the Liaoji Granites were the basement rock on which the Paleoproterozoic strata were deposited. It was formed by extension resulted in the deposition of Paleoproterozoic strata, therefore, the Liaoji Granites were anorogenic tectonically.
Keywords:Genetic type  Emplacement age  A-type granite  Paleoproterozoic  Tonghua area  Southern Jilin province
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