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Mineral Exploration and Resource Evaluation

Ore-controlling Effect of Structural Geometry Features in the Sanshandao Gold Belt,Jiaodong Peninsula,China: Insights from Numerical Simulation

  • Lingzhi ZHONG ,
  • Xiancheng MAO ,
  • Zhankun LIU ,
  • Keyan XIAO ,
  • Chuntan WANG ,
  • Wu CHEN
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  • 1.School of Geosciences and Info-physics, Central South University, Changsha 410083, Hunan, China
    2.Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Ministry of Education), Central South University, Changsha 410083, Hunan, China
    3.MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Received date: 2022-01-07

  Revised date: 2022-04-06

  Online published: 2022-09-14

Abstract

The morphology,amounts and location of orebodies in the Sanshandao gold belt,Jiaodong Peninsula are closely related to fault.The orebodies are mostly hosted by the fault parts with the characteristics of gentle or dip changing from gentle to steep.In oder to explore the control effect of fault geometry on gold mineralization,the geological model (e.g.,fault zone,orebodies,wall rocks and cover) of the Sanshandao belt was constructed,and the numerical simulation was carried out by FLAC3D software.The simulation results show that the corners of the Sanshandao fault are prone to accumulate greater shear strain (up to 8% than wall rocks) and volumetric strain (up to 2% than wall rocks) in the striking direction,where occurs an expansion space. This results in the formation of local thick gold orebodies at the corner where with a included acute angle of the fault and the NE-SW principal compressive stress.In terms of the dip direction,the gentle parts where the fault zone changes from steep (dip angle greater than 60°) to gentle (dip angle in 30°~40°) occur the dialation (volume strain:1%~2%),while the steep parts occur the compression characteristics (volume strain:-1%~0). This differential stress distribution at different dip parts controls the discontinuous and intermittent distribution of orebodies along the dip direction.From a view of 3D,the ore-forming fluids in the Xinli segment,southern part of the Sanshandao belt,migrates from the SE areas at depth to NW at shallow,while the Sanshandao,Xiling,and Beibuhaiyu segments show a trend of flowing from NE to SW.This difference in fluid flow direction may be attributed to the bending fault intersurface formed by the co-operative deformation in strike and dip directions at Xinli controlling the SE dipping of the expansion zone.Therefore,the SE areas at depth in the Xinli segment,and the NE areas at depth in Sanshandao and Xiling segment have the good metallogenic potential.

Cite this article

Lingzhi ZHONG , Xiancheng MAO , Zhankun LIU , Keyan XIAO , Chuntan WANG , Wu CHEN . Ore-controlling Effect of Structural Geometry Features in the Sanshandao Gold Belt,Jiaodong Peninsula,China: Insights from Numerical Simulation[J]. Gold Science and Technology, 2022 , 30(3) : 352 -365 . DOI: 10.11872/j.issn.1005-2518.2022.03.018

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