Earth Science Frontiers ›› 2010, Vol. 17 ›› Issue (2): 178-184.

• Article • Previous Articles     Next Articles

Re-discussion on the metallogenic age of Zhulazaga gold deposit in Alashan Area, Inner Mongolia: Evidence from zircon U-Pb SHRIMP age.

LI  Dun-Jian, DI  Yu-Sheng, YANG  Yong-Jiang, WANG  Pan-Bin, LI  Cheng-Dong, CUI  Lai-Wang, ZHOU  Gong-Yang, LIU  Xiao-Yang, LIU  Xiao-Xue, LI  Sheng   

  1. 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences(Beijing), Beijing 100083, China
    2Tianjin Center, China Geological Survey, Tianjin 300170, China
    3Beijing SHRIMP Center,  Chinese Academy of Geological Sciences, Beijing 100037, China
    4Institute of Geological Survey of Inner Mongolia Autonomous Region, Huhhot  010020, China
  • Received:2010-01-10 Revised:2010-01-30 Online:2010-03-15 Published:2010-04-05

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Abstract:

Zhulazaga gold deposit is a super large strataboundreconstructive gold  deposit that has been found in recent years in Alashan area, Inner Mongolia. The gold deposit occurs in Mesoproterozoic strata and has great ore prospecting potential; so many people are interested in it. The host rocks mainly are calcareous siltstone and silty slate. Single zircon UPb and quartz 40Ar/39Ar methods are applied to determining the UPb ages of metallogenic periods graniteporphyry and postmetallogenic periods dioriteporphyrite, and the 40Ar/39Ar age of Aubearing quartzsulfide ore body in 2006. The measurements on the zircons showed (304±5) Ma from the metallogenic periods graniteporphyry and (2586±57) Ma from the postmetallogenic periods dioriteporphyrite. The measurement on the quartz from the Aubearing quartzsulfide ore body showed (2823±0.9) Ma. Zircon SHRIMP UPb dating of graniteporphyry and dioriteporphyrite in this study showed that the metallogenic periods graniteporphyry has an emplacement age of (280±6) Ma,and the postmetallogenic periods dioriteporphyrite has an emplacement age of (279.7±5.2) Ma. The time difference between the ages of graniteporphyry and dioriteporphyrite is only 0.3 Ma,thus providing a precise metallogenic age of Zhulazaga gold deposit close to 280 Ma(279.7280 Ma).

Key words: graniteporphyry, dioriteporphyrite, zircon SHRIMP UPb age, Zhulazaga gold deposit

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