J4 ›› 2010, Vol. 40 ›› Issue (4): 859-868.

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Geochemical Characteristics and LA-ICP-MS Zircon U-Pb Dating of Basic Dykes in the Xiaomiao Area, Eastern Kunlun

REN Jun-hu1, LIU Yi-qun1, ZHOU Ding-wu2, FENG Qiao2, ZHANG Kun3,DONG Zhong-liang3,QIN Ping-li4   

  1. 1.Geology Department/State Key Laboratory of Continental Dynamics,Northwest University,Xi’an 710069,China;
    2.College of Geological Science and Engineering,Shandong University of Science and Technology, Qingdao, Shandong 266510, China;
    3.Exploration and Development Research Institute of Daqing Oilfield Company Ltd., Daqing|Heilongjiang 163712, China;
    4.Research Institute of Regional Geology Mineral Resources,Shaanxi Bureau of Geological and Mineral Resources, Xianyang,Shaanxi 712000, China
  • Received:2009-10-07 Online:2010-07-26 Published:2010-07-26

Abstract:

The basic dykes in Xiaomiao area of Eastern Kunlun intrude into Jinshuikou group. Their geochemistry is characterized by low contents of TiO2, MgO, P2O5 and Na2O＞K2O，meanwhile, they have high contents rare earth elements and enriched in light rare earth elements. Comparing with the primitive mantle, they are distinctly enriched in the large-iron-lithophile elements(such as Rb, Ba, Th, U and Sr) and Th and depletion of high-field-strength element(such as Nb and Ta). Geochemical features of basic dykes indicate that the magma was influenced by the crustal source and related to continental extensional zone (incipient rift). LA-ICP-MS zircon U-Pb dating indicates that the age of (1996-2428)Ma represent the ages of captured zircon，which formed in regional tectonic thermal event during Archean to Palaeoproterozoic period. The age of (733.6±6.6) Ma (MSWD=0.038) may be the crystallized age of the basic dykes, which can be listed as the age of the Rodinia continent spliting. The basic dykes formed in continental rift environment of the Eastern Kunlun.

Key words: geochemistry, LA-ICP-MS ziron U-Pb dating, basic dykes, tectonic setting, Xiaomiao area, eastern Kunlun

CLC Number: 

  • P597
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