Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (2): 461-468.doi: 10.13278/j.cnki.jjuese.201602113

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Geochemical Characteristics and Tectonic Setting of Gejiumu Lithosome in Nanjian County, Yunnan

Xu Chao1, Xiao Yuanfu2, Shen Lijun2, Chang Jing2, Li Hongxiao2, Zhao Yanan2, Yang Kairui2   

  1. 1. Shandong Lunan Geological Engineering Investigation Institute, Yanzhou 272100, Shandong, China;
    2. College of Earth Science, Chengdu University of Technology, Chengdu 610059, China
  • Received:2015-04-20 Published:2016-03-26
  • Supported by:

    Supported by China Geological Survey Projects(1212011220386)

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Abstract:

Gejiumu Lithosome located in the western Yunnan alkali-rich porphyry band, which belongs to the southern section of Jinshajiang-Red River alkali-rich intrusive lithosome. An analysis is conducted to figure out the geochemical characteristics of the rock mass. The result shows that Gejiumu Lithosome is characterized by high potassium, alkali, and belongs to a high potassium calc-alkali or potassium basalt series. The trace and lanthanon elements analysis show that the ratios of LREE/HREE and (La/Yb)N are 12.60-19.25 and 17.02-34.87 respectively, belonging to the light lanthanon enrichment type, with the delta Eu of 0.73-0.98, a slight negative Eu anomaly. The magma of Gejiumu Lithosome should come from a high-pressure environment of the upper mantle or the lower crust, with mantle metasomatism experienced and alkali-rich magma mixed. The weighted average age of the zircon U-Pb dating (LA-MC-ICPMS) is (37.91±0.35) Ma (n=27 MSWD=0.99). The studies show that Gejiumu Lithosome formed in the late India-Eurasia collision of tectonic transformation stage, also known as the early stage of the post collision.

Key words: geochemical, tectonic setting, Gejiumu Lithosome, Nanjian county, Yunnan

CLC Number: 

  • P595

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