Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (2): 443-460.doi: 10.13278/j.cnki.jjuese.201602112

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Geochronology, Petrogenesis, Source and Its Structural Significance of Houtougou Monzogranite of Wulonggou Area in Eastern Kunlun Orogen

Yan Wei1, Qiu Dianming2, Ding Qingfeng1, Liu fei1   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Editorial Department of Journal of Jilin University, Changchun 130026, China
  • Received:2015-08-14 Published:2016-03-26
  • Supported by:

    Supported by the Fundamental Research Funds for the Central Universities (JCKY-QKJC34) and the National Natural Science Foundation of China(41572056)

Abstract:

This paper presents a detailed research work on LA-ICP-MS zircon U-Pb geochronology, geochemistry, and zircon Hf isotope of the Houtougou monzogranite in Wulonggou area of the eastern Kunlun orogen. The LA-ICP-MS zircon dating of the Houtougou monzogranite yields an average 206Pb/238U age of (419.0±1.9) Ma, belonging to Late Silurian. Its geochemical features show that the Houtougou monzogranite belongs to a high-K calc-alkaline series of A2-type granite, and is characterized by high SiO2, high K2O, high Y (>33×10-6) and Yb, low Al2O3 and Sr (<100×10-6), with a significant negative Eu anomaly, enriched in Rb, Th, U, La, Ce, and Nd, depleted of Nb, Ta, Ba, Sr, P, and Ti. The zircon Hf Isotopic data demonstrate that their εHf(t) values range from 0.2 to 5.1 with the model ages (TDM2) of 1066 to 1371 Ma. It implies that their primary magma was likely derived from partial melting of lower Mesoproterozoic mafic crust. The trace elements and their characteristic ratios show that the Houtougou monzogranite emplaced in the post-orogenic stage of the eastern Kunlun orogen in Late Silurian. In view of the above facts, the closure of Proto-Tethys occurred in Late Silurian (~419 Ma) rather than Early Devonian in the eastern Kunlun orogen.

Key words: Houtougou monzogranite, lithological geochemistry, zircon U-Pb geochronology, zircon Hf isotopic systematic, eastern Kunlun orogen

CLC Number: 

  • P588.121

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