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YANG Zai-chao, XIAO Pei-Xi, GAO Xiao-Feng, et al. LA-ICP-MS Dating of the Aegirine-Augite Syenite of Yushishan Nb-Ta Deposit in Eastern Altun and Its Constraints on the Metallogenetic Age[J]. Northwestern Geology, 2014, 47(4): 187-197.
Citation: YANG Zai-chao, XIAO Pei-Xi, GAO Xiao-Feng, et al. LA-ICP-MS Dating of the Aegirine-Augite Syenite of Yushishan Nb-Ta Deposit in Eastern Altun and Its Constraints on the Metallogenetic Age[J]. Northwestern Geology, 2014, 47(4): 187-197.
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LA-ICP-MS Dating of the Aegirine-Augite Syenite of Yushishan Nb-Ta Deposit in Eastern Altun and Its Constraints on the Metallogenetic Age

  • 1. Geological Survey, China University of Geosciences, Wuhan 430074, China;

  • 2. Xi'an Center of Geological Survey, CGS, Xi'an 71005, China;

  • 3. Gansu Geological Survey, Lanzhou 73000, China

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  • Received Date: September 11, 2014
  • Revised Date: October 19, 2014
  • Available Online: July 28, 2022
  • Published Date: December 04, 2014
    Graphical Abstract
    • Abstract
  • Lying in the joint of Hongliugou-Lapeiquan ophiolitic melange zone (eastern part of the Altun Mountains), Qilian orogenic belt and Oulongbuluke microcontinent, Yushishan Nb-Ta Deposit is a large-size deposit recently discovered. Based on the study of its metallogenic background, the major ore-bearing strata is found to be Ao'yougou Formation of Changchengian Period. The lithological association includes metamorphic volcanic rock and marble, mixed with aegirine-augite syenite, where develop minerals rich in Nb-Ta such as fine-grain pyrochlore and aegirine-augite. The LA-ICP-MS dating for zircons from an aegirine-augite syenite sample yields the diagenetic age of 776.8±2.5 Ma, indicating that the metallogenic age is similar or slightly later than the mineralization of the rock. Combined with petrological-mineralogical characteristic under the microscope and metallogenic age, the aegirine-augite syenite and Nb-Ta deposit were probably formed in continental rift tectonic background induced by the breakup of Rodinia supercontinent in Nanhua Period.
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