Zircon LA-ICP-MS U-Pb Dating of Granitic Intrusion in the Core of Lushan Metamorphic Core Complex and Its Geological Significance
详细信息
- 责任者：Li Xuegang (Key Laboratory of Tectonic and Petroleum Resources ; Ministry of Education ; China University of Geosciences ; Wuhan 430074 ; China) ; Yang Kunguang
- 刊名：Journal of Mineralogy and Petrology
- 出版年：2010
- 卷期：30(4)
- 关键词：变质核杂岩 ; metamorphic core complexes ; 铀—铅计时 ; U-Pb dating ; 庐山 ; Lushan Mountains
- 页码：p.36-42
- 图表：4 illus., 1 table, 19 refs.
- 分类号：0802
- issnNo：ISSN1001-6872
- isbnNo：CN51-1143/TD
摘要
Lushan metamorphic core complex (MCC) is the shallow response of lithospheric extending and thinning during the Mesozoic in South China. Based on the study of zircon LA-ICP-MS U-Pb geochronology and characteristics of metamorphism and deformation of Mesozoic granitic intrusions in the core of MCC, it was considered that intense magmatic activity occurred during (123.3～133.0) Ma which lags behind the formation of Lushan metamorphic core complex. Granitic intrusions are nearly parallel to NNE strike belts and the position of intrusion band may be the rifting and collapse parts of lithosphere due to extension. Macroscopically, intrusion does not have obvious characteristics of active invasion. Inherited zircons of Donggushan intrusion indicates that there existed once 900 Ma magmatic activity in the depth of crust, which may be the record of Jiangnan Greenville orogenic event.
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