Detrital zircon of 4.1 Ga in South China  

作　　者：XU YaJun DU YuanSheng HUANG HongWei HUANG ZhiQiang HU LiSha ZHU YanHui YU WenChao 

机构地区：[1]State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430074,China [2]State Key Laboratory of Geological Processes and Mineral Resources,China University of Geoscienees,Wuhan 430074,China [3]Guangxi Bureau of Geology,Mineral Prospecting and Exploitation,Nanning 530023,China

出　　处：《Chinese Science Bulletin》2012年第33期4356-4362,共7页

基　　金：supported by the National Natural Science Foundation of China (40972078 and 40921062);"111" Project (B08030);the Fundamental Research Funds for the Central Universities,China University of Geosciences (Wuhan)

摘　　要：One hadean zircon from the Cambrian sandstone in the southern part of South China has a U-Pb age of 4107±29 Ma with ε Hf(t) value similar to that of the homochronous depleted mantle and Hf model age of 4102±21 Ma.This demonstrates the existence of hadean crustal remnant in South China.A close match between the U-Pb age and Hf model age with the highly position ε Hf(t) value indicates the growth and immediate reworking of juvenile crust from the depleted mantle at ca 4.1 Ga.The prominent "Pan-African" and Grenville zircons derived from the exotic sources were also found in the sample,which indicates a linking between South China and Gondwana in the Cambrian period.The southern part of South China has complex histories of crustal growth and tectonic evolution.One hadean zircon from the Cambrian sandstone in the southern part of South China has a U-Pb age of 4107±29 Ma with εHf（t） value similar to that of the homochronous depleted mantle and Hf model age of 4102±21 Ma. This demonstrates the existence of hadean crustal remnant in South China. A close match between the U-Pb age and Hf model age with the highly position εHt（t） value indicates the growth and immediate reworking of juvenile crust from the depleted mantle at ca 4.1 Ga. The prominent ＂Pan-African＂ and Grenville zircons derived from the exotic sources were also found in the sample, which indicates a linking between South China and Gondwana in the Cambrian period. The southern part of South China has complex histories of crustal growth and tectonic evolution.

关 键 词：中国南方 碎屑锆石 U-PB年龄 GA 地壳增长 模式年龄 亏损地幔 冈瓦纳古陆 

分 类 号：P578.941[天文地球—矿物学] P597.3[天文地球—地质学]