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Geoscience ›› 2013, Vol. 27 ›› Issue (4): 818-830.

• Petrology • Previous Articles     Next Articles

Research on U-Pb Chronology in Xitian Pluton of Hunan Province

CHEN Di,MA Ai-jun,LIU Wei,LIU Yao-rong,NI Yan-jun   

  1. ( Hunan Institute of Geological Survey, Changsha, Hunan410116,China )
  • Online:2013-08-10 Published:2013-08-07

Abstract:

In this paper, the U-Pb geochronology of zircon of the 8 samples in Xitian pluton of Hunan Province has been measured, using SHRIMP and LA-ICP-MS technique. All zircons from Xitian granite pluton have the oscillatory zoning and high Th/U ratio revealed by the cathodoluminescence (CL) images, which suggest that zircons are magmatic zircons. Based on the new data and the latest reported high-precise dating of the related granites, the magmatic activities in the study area can be ascribed to four stages as follows: The first stage of Indosinian(230-224 Ma),the peak was about 228 Ma;The second stage of Indosinian was about 215 Ma; The first stage of Yanshanian(160-147 Ma),the peak was about 151 Ma; The second stage of Yanshanian was after 141 Ma.

Key words: Xitian pluton, SHRIMP, LA-ICP-MS, U-Pb chronology, Hunan

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