The 40Ar/39Ar geochronology constraint and geological significance of mylonites in Shangyi-Chicheng fault belt on the north of North China Craton  

作　　者：胡玲 宋鸿林 颜丹平 胡道功 

机构地区：[1]Faculty of Geology and Resources, China University of Geosciences, Beijing 100083,Chin [2]Faculty of Geology and Resources, China University of Geosciences, Beijing 100083,China [3]Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081,China

出　　处：《Science China Earth Sciences》2003年第11期1134-1141,共8页中国科学（地球科学英文版）

基　　金：the National Natural Science Foundation of China(Grant No.49772148); the Open Lab of the Geo-dynamics(Grant No.dlkf-9802) under the administration of the Ministry of Geology and Mineral Resources of China.

摘　　要：A dating of two biotite samples taken from the meso- and low-temperature myloniteswithin the Shangyi-Chicheng fault belt on the north of the North China Craton yields 40Ar/39Ar iso-topic ages of (399 1) Ma and (263 2) Ma, respectively. These data reflect an Early Devonian deformation and a Late Carboniferous retrograde metamorphism event along the fault, suggesting that the tectonic activities of the North China Craton in Paleozoic should be reconsidered.A dating of two biotite samples taken from the meso- and low-temperature mylonites within the Shangyi-Chicheng fault belt on the north of the North China Craton yields 40Ar/39Ar isotopic ages of (399 ± 1) Ma and (263 ± 2) Ma, respectively. These data reflect an Early Devonian deformation and a Late Carboniferous retrograde metamorphism event along the fault, suggesting that the tectonic activities of the North China Craton in Paleozoic should be reconsidered.

关 键 词：Shangyi-Chicheng FAULT belt  mylonite  40AR/39AR isotopic ages  re-activity fault. 

分 类 号：P597[天文地球—地球化学]