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Zircon LA-ICPMS U-Pb Geochronology of the Beryl-Bearing Pegmatite and Its Geological Significance,Western Yunnan,Southwest China

Li Zaihui，Tang Fawei，Lin Shiliang，Cong Feng，Xie Tao，Zou Guangfu   

  1. Chengdu Institute of Geology and Mineral Resources, Chengdu610081，China
  • Received:2013-07-28 Online:2014-03-26 Published:2014-03-26

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1021

Abstract:

Zircon LA-ICP-MS U-Pb dating and geochemical analyses were carried out for the beryl-bearing pegmatite of Tengchong-Lianghe area, western Yunnan. Dating results revealed that the beryl-bearing pegmatite were formed at (48.1±0.8) Ma (MSWD=4.0). Zircon morphology and trace element feature indicate that the zircons suffered from hydrothermal alteration. The beryl-bearing pegmatite shows similar characteristics with respect to major elements, trace elements and rare elements with muscovite granite which formed during 55-52 Ma. They are sub-alkaline series, peraluminous granite with strongly Eu depletion, relatively enriched HREE with （La/Yb）N=1.61-1.92 and showing typical M-type of REE tetrad effect. The genesis of beryl-bearing pegmatite is related to the evolution of muscovite granitoids and the crystallization temperature of beryl-bearing pegmatite is 581 ℃. It indicates the overthickened crust tectonic setting caused by India-Asia continental collision.

Key words: beryl-bearing pegmatite, geochemistry, zircon U-Pb dating, REE tetrad effect, western Yunnan

CLC Number: 

  • P597
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