U-Pb ages and Hf isotopes for detrital zircons from quartzite in the Paleoproterozoic Songshan Group on the southwestern margin of the North China Craton

被引:120
作者
Diwu ChunRong [1 ]
Sun Yong [1 ]
Yuan HongLin [1 ]
Wang HongLiang [1 ]
Zhong XingPing [1 ]
Liu XiaoMing [1 ]
机构
[1] NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
来源
CHINESE SCIENCE BULLETIN | 2008年 / 53卷 / 18期
基金
中国国家自然科学基金;
关键词
detrital zircons; North China Craton; Hf isotope; the Songshan Group; quartzite;
D O I
10.1007/s11434-008-0342-1
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In situ U-Pb dating and Lu-Hf isotopic analysis were carried out for detrital zircons from quartzite in the Paleoproterozoic Songshan Group on the southern margin of the North China Craton (NCC). The results provide further constraints on the crustal formation and evolution history of NCC. Four Pb-207/Pb-206 age populations were obtained from 99 analyses, with clusters at similar to 3.40 Ga, 2.77-2.80 Ga, similar to 2.50 Ga and 2.34 Ga, respectively. The 3.40 Ga old zircons have similar Hf isotopic compositions to those from Archean rocks in the Jidong and Anshan areas of NCC. However, crustal remnants older than 3.6 Ga have been identified in the southern margin of NCC, the South China Craton, the northwestern part of the Qinling Orogen and its adjacent area. Thus, it is not easy to trace the source rock from which the 3.40 Ga detrital zircons were derived. It can be inferred that the crustal remnants older than 3.40 Ga might have been widely distributed in the North China Craton. The 2.77-2.80 Ga zircons make up a relatively small proportion and have the highest epsilon(Hf) (t) values (up to 6.1 +/- 1.6), consistent with the Hf isotopic composition of the depleted mantle at 2.83 Ga. Their single-stage Hf model age of 2.83 Ga is close to their crystallized age, suggesting that their source rocks were extracted from the contemporaneous depleted mantle. The similar to 2.50 Ga zircon grains constitute about 85% of the total grain population and their Hf isotopic compositions indicate major growth of juvenile crust at similar to 2.50 Ga but minor reworking of ancient crust. The youngest zircon dated in this study gave an U-Pb age of 2337 +/- 23 Ma, which can be considered the maximum depositional age of the formation of the Songshan Group.
引用
收藏
页码:2828 / 2839
页数:12
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