Geochronology and Hf isotopes of granite gravel from Fanjingshan, South China: Implication for the precambrian tectonic evolution of western Jiangnan orogen
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- 作者：Jinbao Su (1)
Yueqiao Zhang (2)
Shuwen Dong (3)
Xuanhua Chen (3)
Yong Li (2)
Jianjun Cui (2) - 关键词：Jiangnan orogeny ; Nanhua rift ; Rodinia ; Neoproterozoic
- 刊名：Journal of Earth Science
- 出版年：2014
- 出版时间：August 2014
- 年：2014
- 卷：25
- 期：4
- 页码：619-629
- 全文大小：2,207 KB
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Yueqiao Zhang (2)
Shuwen Dong (3)
Xuanhua Chen (3)
Yong Li (2)
Jianjun Cui (2)
1. School of Earth Sciences and Engineering, Hohai University, Nanjing, 210098, China
2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China
3. Chinese Academy of Geological Sciences, Beijing, 100037, China - ISSN：1867-111X
文摘
The debate of assembly time between the Yangtze and Cathaysia blocks has aroused the disputation on the formation mechanism of Jiangnan orogen, South China. Therefore widespread magmatism of 830-50 Ma in South China is interpreted as the product of either plume or arc magmatism, which results in distinctive depositional background in the Neoproterozoic. Granite gravel located at the unconformity between the Banxi Group and Fanjingshan Group of the western Jiangnan orogen was collected, which gave a new age limit to the deposition of the Banxi Group and Nanhu rift. Zircons from the granite gravel crystallized yield a weighted mean 206Pb/238U age of 789±11 Ma, which probably represents the end of the Jiangnan orogeny and marks the onset of Nanhua rift. These zircons have negative ? Hf(t) of ?.1 to ?.0, with T DM of 1.38-.52 Ga and T crust of 1.81-.98 Ga indicating an old continental crust origin for the granite.