Earth Science Frontiers ›› 2011, Vol. 18 ›› Issue (5): 206-212.

• Article • Previous Articles     Next Articles

Precise IDTIMS zircon UPb age and wholerock geochemistry of the Nanlinshan mafic intrusion in the southern Lancangjiang arc terrane, Sanjiang area, SW China.

关键词：U-Pb年龄；锆石；ID-TIMS；岛弧；南林山；澜沧江   

  1. 1. State Key Laboratory of Geological Processes and Mineral Resources； School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
    2. No.2 Gold Geological Party of CAPF， Huhhot 010010， China
    3. Yunnan Institute of Geological Survey, Kunming 650051， China
  • Received:2011-05-28 Revised:2011-07-20 Online:2011-09-18 Published:2011-09-18

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Abstract:

 The Nanlinshan gabbroic intrusion occurred in the southern Lancangjiang arc terrane, Sanjiang area, SW China, which consists of gabbro and diorite. The UPb age of zircons from the diorite determined by IDTIMS is 29844±033 Ma. The diorite and gabbro samples are all characterized by moderate enrichment of light rareearth elements relative to heavy rareearth elements and depletion in some high field strength elements such as Nb, Ta, Zr, and Hf. These characteristics are similar to that of the island arc, and the Nanlinshan intrusion can be considered as an evidence for intraoceanic subduction in the Early Permian in the region.

Key words: U-Pb dating, zircon, ID-TIMS, island arc, Nanlinshan, Lancangjiang

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