Episodic Growth and Multiple Modification of Precambrian Lower Crust in the Southeastern Margin of North China Craton: Petrologic, Geochronological and Hf-Isotopic Evidences
详细信息
- 责任者：Liu Yican (Key Laboratory of Crust-Mantle Materials and Environments ; Chinese Academy of Sciences ; Hefei 230026 ; China) ; Wang Andong
- 刊名：Journal of Earth Sciences and Environment
- 出版年：2012
- 卷期：34(4)
- 关键词：变质岩 ; metamorphic rocks ; 地壳生长 ; crustal growth ; 铀—铅计时 ; U-Pb dating ; 华北地台 ; North China Platform ; 安徽 ; Anhui Province
- 页码：p.1-11
- 图表：5 illus., 67 refs.
- 分类号：0802
- issnNo：ISSN1672-6561
- isbnNo：CN61-1423/P
摘要
The Early Precambrian is regarded to be a crucial stage for continental crust formation. The Precambrian lower-crustal rocks in the southeastern margin of North China Craton occur as the exposed metamorphic basement (named as the Wuhe metamorphic complex) and xenoliths in the Mesozoic dioritic to monzodioritic porphyry. These rocks provide an excellent natural laboratory to study formation and evolution of the Precambrian lower crust in the region. Integrated investigations on metamorphic petrology, petrologic geochemistry, Hf-isotope and zircon U-Pb geochronology of the rocks suggested that the Precambrian lower crust beneath the studied region experienced an episodic growth and multiple modification history.