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Chinese Science Bulletin

, Volume 54, Issue 9, pp 1543–1554 | Cite as

Paleoproterozoic reworking of ancient crust in the Cathaysia Block, South China: Evidence from zircon trace elements, U-Pb and Lu-Hf isotopes

  • Rui Liu
  • HanWen ZhouEmail author
  • Li Zhang
  • ZengQiu Zhong
  • Wen Zeng
  • Hua Xiang
  • Song Jin
  • XinQian Lu
  • ChunZhong Li
Articles/Geochemistry

Abstract

A combined study of zircon LA-ICP-MS U-Pb dating, trace elements and Hf isotope was carried out for gneissic granite from the Sanzhishu area in Jingning, SW Zhejiang Province. Nearly all the zircons separated from the granite exhibited oscillatory zoning and high Th/U ratios (>0.1). The REE profile showed a pronounced positive Ce anomaly, negative Eu anomaly and an enrichment of HREE, which are typical characteristics of magmatic zircon. Thirteen concordant or nearly concordant analytical data yielded a weighted mean 207Pb/206Pb age of 1860±13 Ma (MSWD=0.084), representing the formation age of the granite. The magmatic zircons had negative εHf(t) values of −15.6 to −10.0 and two-stage Hf model ages of 3.1 to 3.4 Ga, indicating that the granites were formed by reworking of ancient crust. The major- and trace-element data indicate that the gneissic granites are metaluminous high-K calc-alkaline rocks and exhibit the same geochemical characteristics as aluminous A-type granites, implying the emplacement of the granite in a post-orogenic extensional tectonic setting. We conclude that the Paleoproterozoic crustal reworking event in the Cathaysia Block of South China marked the transition from assembly to break-up of the Columbia supercontinent.

Keywords

zircon U-Pb age Hf isotope Paleoproterozoic crustal reworking southwestern Zhejiang Province 

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Copyright information

© Science in China Press and Springer-Verlag GmbH 2009

Authors and Affiliations

  • Rui Liu
    • 1
  • HanWen Zhou
    • 1
    Email author
  • Li Zhang
    • 1
    • 2
  • ZengQiu Zhong
    • 1
  • Wen Zeng
    • 1
  • Hua Xiang
    • 1
  • Song Jin
    • 1
  • XinQian Lu
    • 3
  • ChunZhong Li
    • 3
  1. 1.State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth SciencesChina University of Geosciences (Wuhan)WuhanChina
  2. 2.State Key Laboratory of Continental DynamicsNorthwest UniversityXi’anChina
  3. 3.The 7th Geological Team of Zhejiang ProvinceLishuiChina

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