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Geoscience ›› 2017, Vol. 31 ›› Issue (01): 11-19.

• Mineral Deposit and Petrology • Previous Articles     Next Articles

Geological Characteristics, Zircon LA-MC-ICP-MS U-Pb Age of Kailekesaiyi Iron Deposit in Altay, Xinjiang, and Their Geological Implications

GUO Xuji1(), LI Yan2, YANG Chengdong3()   

  1. 1. No.706 Geological Team, Xinjiang Nonferrous Geoexploration Bureau, Altay, Xinjiang 836500, China
    2. Institute of Prospecting Technology Research of Hebei Bureau of Geology and Mineral Exploration, Sanhe, Hebei 065201, China
    3. Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources,Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2016-09-07 Revised:2016-12-02 Online:2017-02-10 Published:2017-03-16

Abstract:

Kailekesaiyi iron deposit, the unique small specularite deposit in Altay, Xinjiang, occurs in a sequence of metamorphic volcanic-sedimentary rocks. The wall-rock is muscovite quartz schist, and the orebodies are stratiform and in accordance with the stratigraphic occurrence. The ores occur as massive, banded, and striped structures. Ore minerals are dominated by specularite (TFeO=87.349%-88.988%,TiO2=0-1.042%,Al2O3=0.036%-0.256%) with sedimentary characteristics. Zircons from the specularite muscovite-quartz schist yield a LA-MC-ICP-MS U-Pb concordant age of (375.6 ± 0.6) Ma, and constrained the ore forming age to the Middle Devonian (ca.376 Ma), suggesting that this deposit is one product of the few Middle Devonian mineralization in Altay. Meanwhile, the ore-bearing metamorphic volcanic-sedimentary rocks are dated to the Middle-Late Devonian Altay Formation, rather than the Early Devonian Kangbutiebao Formation which is considered by the previous scholars.

Key words: iron deposit, geological characteristic, zircon U-Pb dating, Kailekesaiyi, Altay, Xinjiang

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