The Ar-Ar Age of the Nanxiong Fault Zone in Guangdong Province
详细信息
- 责任者：Li Chu’an (Guangdong Geological Survey ; Guangzhou 510080 ; China) ; Zou Heping
- 刊名：Acta Scientiarum Naturalium Universitatis Sunyatseni
- 出版年：2011
- 卷期：50(1)
- 关键词：氩—氩计时 ; Ar-Ar dating ; 断裂带 ; fracture zones ; 广东 ; Guangdong Province
- 页码：p.129-132
- 图表：3 illus., 1 table, 14 refs.
- 分类号：0300
- 出版序号：20120038
- issnNo：ISSN0529-6579
- isbnNo：CN44-1241/N
摘要
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. The Ar-Ar chronology data of the Nanxiong fault zone provide a new geochronological constraint on the Cretaceous lithospheric extension in South China.
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