Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (1): 135-145.doi: 10.13278/j.cnki.jjuese.201601112

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Zircon U-Pb Geochronology, Geochemical Characteristics and Geological Significance of Volcanic Rocks of Haerjiawu Formation in Qiada, West Junggar

Tian Zhixian1,2,3, Li Yongjun1,2, Tian Meng4, Yang Gaoxue1,2, Xiang Kunpeng1,2, Tong Lili1,2   

  1. 1. Earth Science & Resources College, Chang'an University, Xi'an 710054, China;
    2. Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi'an 710054, China;
    3. Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
    4. Xinjiang Institute of Geological Exploration for Nonferrous Resources, Urumqi 830000, China
  • Received:2015-04-25 Online:2016-01-26 Published:2016-01-26
  • Supported by:

    Supported by National Natural Science Foundation of China (41273033) and Geological Survey Foundation of Xinjiang Uygur Autonomous Region (XJZBKD2008-04, XJQDZ2009-03)

Abstract:

The Early Permian volcanic rocks in Haerjiawu Formation are distributed in eastern Tangbale ophiolite belt on the southwest margin of Junggar basin. The volcanic rocks are mainly composed of greyish-green or purplish-red (vesicular) (amygdaloidal) basalt, basaltic andesite, and andesite. The high-precision LA-ICP-MS zircon U-Pb dating reveals that they were formed in Early Permian at the age of (296.6±8.1) Ma, MSWD=7.7(93% conf.). Geochemically the volcanic rocks belong to sub-alkaline series. They have relatively high content of alkali (w(Na2O+K2O)=3.95%-6.39%), and enriched in sodium. The LREE are relatively enriched ((La/Yb)N=3.49-14.66) and well fractionated ((La/Sm)N=1.68-3.51); while the HREE fractionation is weak ((Gd/Yb)N=1.38-2.56). Only some of the samples have weak negative Eu anomalies (δEu=0.88-1.15). All samples are enriched in LILE; while HFSE are relatively depleted in Nb and Ta but slightly enriched in Zr, Hf. These characteristics, along with element correlation diagram, indicate that the volcanic rocks in Qiada area mainly generated in intra-plate continent with partial island arc environments. These volcanic rocks were from extensional setting of post-collisional period. These island-arc characteristics are inherited from pre-collisional arc component.

Key words: zircon LA-ICP-MS U-Pb age, geochemistry, tectonic setting, volcanic rocks, Haerjiawu Formation, west Junggar

CLC Number: 

  • P588.1

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