Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (5): 1317-1326.doi: 10.13278/j.cnki.jjuese.20180290

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Zircons LA-ICP-MS Chronology, Geochemical Signatures and Geological Significance of Gaoyaohai BIF-Type Iron Deposit in Guyang Greenstone Belt, Inner Mongolia

Li Guangyao, Li Zhidan, Wang Jiaying, Wen Sibo   

  1. Tianjin Center, China Geological Survey, Tianjin 300170, China
  • Received:2018-11-12 Published:2019-10-10
  • Supported by:
    Supported by National Natural Science Foundation of China(41502082)and Project of China Geological Survey(12120113057300, DD20160129, DD20190813, D20190119, DD20160094)

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Abstract: The Gaoyaohai BIF-type iron deposit in Inner Mongolia is located in the northern margin of Western Block of North China Craton,and occurs in the Guyang greenstone belt. The iron deposit is hosted in amphibolites of the Neoarchean-Paleoproterozoic Maohudong Formation Se'ertengshan Group. The iron ores develop needle-columnar granular structure with banded structure. The mineral compositions are mainly magnetite, quartz,and hornblende. The zircon LA-ICP-MS U-Pb dating from the host rock,amphibolite,shows that the weighted average age of (1 933±12) Ma represents the Gaoyaohai BIF ore-rich thermal event. Through protolith restoration,the amphibolites are metamorphic rock, which originated from sub-alkaline basalt series based on the Zr/Ti-Nb/Y diagrams. The geochemical characteristics of the amphibolites indicate that the original rock may be T-MORB. Combined with the tectonic background of T-MORB formation and the regional BIF metallogenic regularity, it is considered that the Gaoyaohai iron deposit formed in the tectonic environment of island arc superimposed mantle plume.

Key words: Gaoyaohai BIF-type iron deposit, zircon U-Pb age, Guyang greenstone belt, Se'ertengshan Group

CLC Number: 

  • P611
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