J4 ›› 2010, Vol. 40 ›› Issue (3): 573-580.

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Rare Earth Element Geochemistry and U-Pb Age of Zircons from Granites in Tengchong-Lianghe Area, Western Yunnan

CONG Feng1, LIN Shi-liang1, XIE Tao1, LI Zai-hui1, ZOU Guang-fu1, LIANG Ting2   

  1. 1.Chengdu Center,China Geological Survey, Chengdu 610081|China;
    2.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
  • Received:2009-08-21 Online:2010-05-26 Published:2010-05-26

Abstract:

Based on detailed regional geological survey, the internal textures, rare earth element composition and U-Pb age of zircons from granites in Tengchong-Lianghe area, western Yunnan, were studied by cathodoluminescence (CL) and LA-ICP-MS, respectively. Both the oscillatory zoning and chondrite-normalized REE pattern characterized by a steeplyrising slope from the LREE to the HREE with the obviously positive Ce anomaly and negative Eu anomaly, indicate the magmatic genesis of these zircons from the granites. The zircons in the granite (D0053) yield a weighted mean 206Pb/238U age of (127.9±1.0) Ma (MSWD=2.9, n=27). Those in granite (D4310) yield a weighted mean 206Pb/238U age of (58.3±0.5) Ma (MSWD=1.8, n=21). The results indicate that there happened widely the Early Cretaceous and Early Tertiary granitic magmatisms in Tengchong-Lianghe area, western Yunnan, as the magmatic response to the tethys evolution.

Key words: western Yunnan, granite, zircon, rare earth element, U-Pb age

CLC Number: 

  • P581
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