Detrital zircon of 4.1 Ga in South China

• 来源期刊: 科学通报(英文版)
• 学科: 地球科学
• 年，卷（期）: 2012,（33）
• 页码范围: 4356-4362
• 页数: 7页
• 分类号: P578.941|P597.3
• 语种: 中文

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.