Home | Contact Us | Sitemap | 中文 | CAS | Director's Email
 
Location:Home > Research > Research Progress
U-Pb ages and Hf isotope compositions of zircons of Taihua Group in Xiaoqinling area, Shaanxi Province TEXT SIZE: A A A

This paper presents new geochemical, LA-ICPMS U-Pb zircon dating and LA-MC-ICPMS zircon Hf isotopic results for a biotite plagioclase gneiss from the Taihua Group at the South of Huashan pluton, Shaanxi Province. Geochemical results indicate that the protolith is intermediate-acidic calc-alkaline granitic rock, with low REE content (Sigma REE = 83. 13 x 10(-6)) and high Pb and LILE element contents (e. g. Rb, Ba). The (176)Hf/(177)Hf ratio of zircons from this sample varies from 0. 281258 to 0. 281404 with obviously negative epsilon(Hf)(t) values (-6. 86 similar to -11. 23). The Hf model ages vary from 2. 96 to 3. 24Ga, indicating that the original magma of the protolith derived from Mesoarchean crust. Comparisons show that the biotite plagioclase gneiss of Xiaoqinling area has similar source of Mesoarchean crust with the Taihua Group in Lushan area, but the timing of formation may be different. Structure of zircons, the Th/U ratio and age indicate that the Tailhua Group in the Xiaoqinling area experienced an important thermal event at similar to 1. 91Ga, which has relationship with the global collision event during convergence of Columbia Supercontinent. The Taihua Group of Xiaoqinling area is part of the southern margin of North China craton, but the Taihua Group in different area has distinction in composition, timing of formation and metamorphic age. Therefore, the Taihua Group is the complex and may be at least separated into two units with Neoarchean and Paleoproterozoic ages, respectively.

  Publication name  ACTA PETROLOGICA SINICA Volume: 27  Issue: 10  Pages: 3095-3108  Published: OCT 2011
  Author(s)  Shi Yu; Yu JinHai; Xu XiSheng; Tang HongFeng; Qiu JianSheng; Chen LiHui
  Corresponding author  

 SHI Yu
 shiyu_61@163.com, jhyu@nju.edu.cn
 Nanjing Univ, State Key Lab Mineral Deposits Res, Sch Earth Sci & Engn, Nanjing 210093, Peoples R China 

 Author(s) from IGCAS  TANG HongFeng

View here for more details from the Web of Knowledge

Copyright © Institute Of Geochemistry, Chinese Academy of Sciences All Rights Reserved.
Address: 99 West Lincheng Road, Guanshanhu District, Guiyang, Guizhou Province 550081, P.R.China
Tel: +86-851-85895239 Fax: +86-851-85895239 Email: web_en@mail.gyig.ac.cn