Geochronology of Igneous Rocks and Nappe Structures in Lengshuikeng Deposit, Jiangxi Province, China
详细信息
- 责任者：Qiu Junting (School of the Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Yu Xinqi
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(3)
- 关键词：花岗斑岩 ; granite porphyry ; 氩—氩计时 ; Ar-Ar dating ; 江西 ; Jiangxi Province
- 页码：p.812-826
- 图表：illus., 2 tables, 53 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
LA-ICP-MS and 40Ar/39Ar isotopic analysis were carried out to constrain the ages of volcanic rock (Daguding Formation and Ehuling Formation), granite porphyry and nappe structure in the Lengshuikeng deposit, Jiangxi Province. The Daguding Formation was formed during the Late Jurassic with U-Pb age of 160.8±1.9Ma. The Ehuling Formation was formed in an intermittent and multi-period magmatic activity, which began at 159Ma and reached its climax at 146.6±2.2Ma. The zircons from granite porphyry in Lengshuikeng yield U-Pb ages ranging from 163.6±2.1 to 154.3±3.0Ma. The nappe structure F2 firstly activated during Caledonian with a 40Ar/39Ar age of 398.5±2.6Ma, and reactivated after 146.6Ma, leading to the superimposition of Sinian System upon Ehuling Formation and broken the granite porphyry in Lengshuikeng deposit.
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