Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (2): 425-442.doi: 10.13278/j.cnki.jjuese.201602111

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Formation and Significance of Adakitic Rocks in Datong Pluton of Early Paleozoic Magmatic Arc of Western Kunlun Orogen

Cao Ying, Wang Jian, Liu Jianguo, Bao Zhenyan, Song Yue, Li Ai   

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

    Supported by the National Natural Science Foundation of China(41472051) and the Foundation of China Geological Survey(1212011121088,12120114044401)

Abstract:

Datong pluton is located between Kegang-Kudi-Qimanyute ophiolite belt and Mazha-Kangxiwa ophiolite belt in the western Kunlun orogen. This paper presents the study of petrography, major and trace elements, geochemistry, zircon U-Pb chronology, and Hf isotopic data of the adakitic rocks, which are in and surround Datong pluton. The adakitic rocks consist of biotite monzonitic granite and quartz monzonitic granite, occurring in small isolated plutons and dykes in the shoshonitic Datong pluton. The adakitic rocks are characterized by high SiO2 (≥60.34%), Al2O3 (≥14.73%), total alkali(w(K2O+Na2O)≥6.40%), low MgO(≤2.35%)and high Sr(≥504×10-6), low Y(≤17.20×10-6), and high Sr/Y(average 70.88). They are prominently enriched in LREE and LILE, depleted of HREE and HFSE, with variably negative Eu anomalies and Ta, Nb, P, and Ti depletion. The zircon U-Pb dating for the adakitic rocks from both isolated and within Datong pluton yields the weighted mean ages of (443.6±1.4) Ma-(462.0±1.0) Ma, which are consistent with the formation of Datong pluton. The zircon εHf (t) values for the adakitic rocks are in the range of -7.28-4.56 (average -0.84). Combined with the regional tectonic evolutionary history, the adakitic rocks eventually emplaced in the shallow level of crust after partial melting of the oceanic crust and the overlain terrigenous sediments during the southward subduction and interaction with the overlain mantle wedge subsequently. The comparison between the shoshonitic Datong pluton with the adakitic rocks is of important significance to understand the formation and geological evolution of the early Paleozoic magmatic arc of the western Kunlun orogen.

Key words: western Kunlun, Datong pluton, Early Paleozoic, magmatic arc, adakitic rocks

CLC Number: 

  • P588.12

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