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CUI Fanglei, WANG Xiaowei, XU Xueyi, et al. Geochronology and Genesis of the Diabase-Dykes from Qijiaojing-Balikun Area in Eastern Tianshan Mountain[J]. Northwestern Geology, 2015, 48(2): 43-56.
Citation: CUI Fanglei, WANG Xiaowei, XU Xueyi, et al. Geochronology and Genesis of the Diabase-Dykes from Qijiaojing-Balikun Area in Eastern Tianshan Mountain[J]. Northwestern Geology, 2015, 48(2): 43-56.
shu

Geochronology and Genesis of the Diabase-Dykes from Qijiaojing-Balikun Area in Eastern Tianshan Mountain

  • 1.

    Xi'an Center of Geological Survey, CGS, Xi'an 710054, Shaanxi, China;Schoolof Earth Science and Resources, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    Xi'an Center of Geological Survey, CGS, Xi'an 710054, Shaanxi, China

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  • Received Date: October 25, 2014
  • Revised Date: March 08, 2015
  • Published Date: June 04, 2015
    Graphical Abstract
    • Abstract
  • The diabase-dykesin Carboniferous, featured by relatively higher Al2O3 and MgO, lower TiO2, and deficient P2O5 and K2O, are widespread in Qijiaojing-Balikun area in East Tianshan Mountain, Xinjiang. Analysis on geochemical characteristics show that REE patterns is right ward oblique characterized by LREE enrichment and HREE depletion;trace elements distribution curve demonstrates LILE enrichment in Cs and K, and HFSE depletionin Nb, Ta, Zr and Hf;uniform abundance of SiO2 and LILE fluctuate in significantly;the magma formatting temperature is close to the interface temperature between asthenosphere and lithosphere, all of the above indicate that the original magma of the diabase-dykes derives from partial melting of enriched mantle wedge, which is metasomated by liquid or melt; the high Mg#(0.64—0.67), low Ce/Y (1.55—1.79) and Dy/Yb (1.97—2.02), and the La/Sm-La diagram shows that the primitive magma of the diabase-dykes with a low evolution may come out of high degrees of partial melting from garnet-phase peridotite; lazy elements such as Zr, Hf and Y, and discrimination diagrams suggest that the diabase-dykes are probably formed in an intraplate environment.The LA-ICP-MS zircon 206Pb/238U age of 314.7±1.5 Ma indicates that Bogda orogenic belt should be extensional environment from late Carboniferous.
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