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Application Status and Progress of Isotopic Geochemistry in Research of Emeishan Large Igneous Province (ELIP)

You Minxin，Liu Jianmin   

  1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing100081，China
  • Received:2013-10-20 Online:2014-07-26 Published:2014-07-26

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Abstract:

The authors had systematically summarize and analyze the previous research results of isotopic geochemistry in Emeishan large igneous province (ELIP). According to the isotopic geochemical data of basalt and intrusions in ELIP, combined with its biostratigraphy, we propose a rough period of 251-263 Ma as the formation age of each rock unit in ELIP. Mafic-ultramafic instrusions in ELIP formed in ~259 Ma, and the basalts, which was viewed as the bulk of ELIP formed in 251-253 Ma. The isotopic geochemical data of Sr-Nd, Re-Os, Lu-Hf and O indicate that the ELIP originate from either mantle plume or subcontinental lithosphere mantle (SCLM). The Emeishan basalts show similar Sr-Nd isotopic characteristcs to the mafic intrutions which is rich of Fe-Ti oxide; and the maficultramafic instrusions bearing Cu-Ni sulfides are closer to crust material, which might be related to crust contamination.

Key words: Emeishan large igneous province, isotopic geochemistry, geochronology, causes

CLC Number: 

  • P597
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