Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1384-1393.doi: 10.13278/j.cnki.jjuese.201505111

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Sm-Nd Dating of Hydrothermal Calcites from Jiaoli-Lae Mercury Deposit, Guizhou Province

Wang Jiasheng1, Wen Hanjie2   

  1. 1. Faulty of Land Resource Engineering/Southwest Institute of Geological Survey, Kunming University of Science and Technology, Kunming 650093, China;
    2. Institute of Geochemistry, Chinese Academy of Sciences/State Key Laboratory of Ore Deposit Geochemistry, Guiyang 550002, China
  • Received:2014-12-12 Published:2015-09-26

Abstract:

San-Dan mercury metallogenic belt is one of the most important parts of the large-scale low-temperature epithermal metallogenic region in Southwestern China, besides Guizhou-Hunan mercury metallogenic belt. To clarify the source of metallogenetic materials, mineralization ages, and geodynamical background is critical for understanding the mineralization mechanism of this region. Considering that the hydrothermal calcite is one of the main gangue minerals of this belt, Sm-Nd geochronology of hydrothermal calcites is used to date Jiaoli-Lae mercury deposit in the middle of the belt. An isochron age (129±20 Ma, MSWD= 0.21, εNd=-12.9) has been obtained. This age suggests that the Hg mineralization occurred in Late Yanshanian. This provides some important information and clues to discover the formation and evolution of the mercury deposits and other deposits of the large-scale low-temperature epithermal metallogenic region in Southwestern China. Referring to some other previous research, we conclude that this area underwent two main mineralizing stages, i. e., early stage of 145-155 Ma Sb mineralization, and late stage of 120-135 Ma Sb, Au, Hg, As mineralization. The limestone εNd value of wall rocks of the Guotang Formation (Lower Ordovician Series) is -12.6, which is in good agreement with the εNd of the hydrothermal calcite. This indicates that the ore materials of this mercury deposit probably originated from the ore-bearing Ordovician carbonatite.

Key words: Jiaoli-Lae mercury deposit, hydrothermal calcite, Sm-Nd dating, San-Dan mercury metallogenic belt, carbonatite

CLC Number: 

  • P597

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