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华北克拉通元古代的三次伸展事件
引用本文:邵济安,张履桥,等.华北克拉通元古代的三次伸展事件[J].岩石学报,2002,18(2):152-160.
作者姓名:邵济安  张履桥
作者单位:1. 中国科学院地质与地球物理研究所岩石圈构造演化开放研究实验室,北京,100029;北京大学地质系,北京,100871
2. 内蒙古地质研究所,呼和浩特,010020
3. 中国地震局地质研究所,北京,100029
基金项目:国家自然科学基金资助项目(40072073),中科院知识创新工程重大课题(KZCX1-07)的研究成果
摘    要:本文根据作者在山西、河北一带获得的三组元古代年龄数据,即基性岩墙群1.855Ga的Rb-Sr等时线年龄;太古代地层大面积钾质交代的^40Ar-^39Ar坪年龄1.262Ga和^49Ar-^39Ar等时线年龄1.274Ga;以及基性岩墙群0.731-0.601Ga的K-Ar稀释法年龄。结合前人研究资料,作者认为华北克拉通存在1.8-1.7Ga,1.3-1.2Ga,和0.8-0.7Ga三次伸展事件,它们之间相隔0.5GA。最后一次伸展事件可以延续到晚元古代末。文章最后提出了华北克拉通这三次事件与全球超大陆裂解事件是否响应和如何响应的问题。

关 键 词:克拉通  元古代  伸展事件  基性岩墙群  钾质交代  超大陆裂解  氩同位素
修稿时间:2001年9月24日

Three Proterozoic extensional events in North China Craton
SHAO JiAn,ZHANG LuQiao and LI DaMing . laboratory of Lithosphere Tectonic Evolution.Three Proterozoic extensional events in North China Craton[J].Acta Petrologica Sinica,2002,18(2):152-160.
Authors:SHAO JiAn  ZHANG LuQiao and LI DaMing laboratory of Lithosphere Tectonic Evolution
Institution:SHAO JiAn,ZHANG LuQiao and LI DaMing . laboratory of Lithosphere Tectonic Evolution,Institute of Geology and Geophysics > Chinese Academy of Sciences,Beijing,China. Department of Geology,Peking University,Beijing,China. Geological Bureau of Inner Mongoli,Huhhot,China. Institute of Geology,China Seismological Bureau,Beijing,China
Abstract:In this work three successive extensional events are identified according to three groups of representative Proterozoic ages obtained in rock samples from Shanxi and Hebei provinces by the authors. The data are respectively the Rb-Sr isochronal age 1. 885Ga of basic swarm dikes, the 40Ar-39Ar plateau age 1. 262Ga and 40Ar-39Ar isochronal age 1. 274Ga of a large area of potassic alteration, and the K-Ar dilution method age 0. 731-0. 601Ga of basic swarm dikes. With other information from previous authors incorporated, the three extensional events are determined as occurring in the North China Craton during 1. 8-1. 7Ga, 1. 3-1. 2Ga, and 0. 8-0. 7Ga respectively, separated from each other by 0. 5Ga. It is discussed in this work whether or how the three events in the North China Craton responded to the breaking events of the global supercontinent.
Keywords:Extensional event  Basic swarm dikes  Potassic alteration  Breaking of the supercontinent  
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