中山大学学报（自然科学版）2011，Vol.50Issue(1)：129-132,4.
广东南雄断裂带Ar-Ar年龄及其地质意义
The Ar-Ar Age of the Nanxiong Fault Zone in Guangdong Province and Their Geological Significance
摘要
Abstract
The Nanxiong fault zone is a large-scale extension detachment structure. According to the results of Ar-Ar laser step-heating dating of the syntectonic muscovite separated from a mylonite sample in the Nanxiong fault zone, combining with the field surveying and microstructure analysis, the initial extension of the Nanxiong fault zone occurred at 117.3 ±2. 7 Ma in Early Cretaceous. The strong extension and ductile shearing of the fault zone took place at the end of the Early Cretaceous or the beginning of the Late Cretaceous with an Ar-Ar plateau age of 94. 6 ± 0. 4 Ma. Two obvious late-stage thermal perturbations are revealed with the Ar-Ar ages of 88.9 ± 1.0 Ma and 81.1 ±2. 0 Ma. The Ar-Ar chronology data of the Nanxiong fault zone provide a new geochronological constraint on the Cretaceous lithospheric extension in South China. The transition stage from the Early Cretaceous to the Late Cretaceous is an important epoch of the lithospheric extension in the study.关键词
南雄断裂带/拉伸剥离断层/糜棱岩/Ar-Ar年龄分类
天文与地球科学引用本文复制引用
李出安,邹和平..广东南雄断裂带Ar-Ar年龄及其地质意义[J].中山大学学报（自然科学版）,2011,50(1):129-132,4.基金项目
中国科学院南海海洋研究所边缘海地质重点实验室基金资助项目(MSGL0701) （MSGL0701）
