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Gold Science and Technology ›› 2023, Vol. 31 ›› Issue (5): 707-720.doi: 10.11872/j.issn.1005-2518.2023.05.090

• Mineral Exploration and Resource Evaluation •     Next Articles

Numerical Simulation of Metallogenic Processes of Dayingezhuang Gold Deposit in Jiaodong Peninsula and Its Prospecting Significance

Wenfa SHAN1,2,3,4(),Xiancheng MAO2,3(),Zhankun LIU2,3,Hao DENG2,3,Jin CHEN2,3,Wei ZHANG2,3,5,Haizheng WANG6,Xin YANG6   

  1. 1.Computational Geosciences Research Centre, Central South University, Changsha 410083, Hunan, China
    2.School of Geosciences and Info-Physics, Central South University, Changsha 410083, Hunan, China
    3.Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, Hunan, China
    4.Hunan Mass Media Vocational and Technical College, Changsha 410100, Hunan, China
    5.School of Municipal and Geomatics Engineering, Hunan City University, Yiyang 413099, Hunan, China
    6.Zhaojin Mining Industry Co. , Ltd. , Zhaoyuan 266009, Shandong, China
  • Received:2023-06-15 Revised:2023-08-22 Online:2023-10-31 Published:2023-11-21
  • Contact: Xiancheng MAO E-mail:wenfashan@qq.com;mxc@csu.edu.cn

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Abstract:

The formation of the Dayingezhuang gold deposit involves the coupled effects of tectonic deformation，pore-fluid transport，heat transfer，and hydrogeochemical reactions.In this paper，FLAC3D nume-rical simulation software and modern mineralization rate concept were used to carry out numerical simulation of force-heat-fluid-chemical coupling of Dayingezhuang gold deposit，so as to explore the controlling effect of fracture structure，bulk deformation，and chemical process coupling on the emplacement of gold orebody.The simulation results demonstrate the following findings： From the perspective of physical process，the steep-slow transition and its local undulation zones along the Zhaoping fault tend to develop larger volume strains with differences of up to 1% compared to the surrounding rocks.This uneven strain distribution leads to the formation of uneven ore-holding spaces and pore pressure variation distribution.Significantly differences between high values of positive and negative pore pressure gradients are observed near the zones with large volume strains，while the differences in other zones are less notable.From the perspective of chemical process，mineralizing fluids tend to converge and stagnate at sites with high volume strain during their migration from the deep to the shallow parts.This convergence of mineralizing fluids leads to a greater precipitation of gold orebodies （mineralization rate less than 0），indicating the occurrence of intense water-rock reactions.In contrast，the areas where the mineralizing fluids don’t converge exhibit a predominance of positive mineralization rate dis-tribution，suggesting the absence of significant gold orebody precipitation.Furthermore，the ROC curve analysis with an AUC value of 0.815 provides quantitative evidence of the strong correlation between the mineralization rate and known gold orebodies，suggesting that this coupling of multiple physical-chemical processes at the same sites may be a key factor governing the formation of Dayingezhuang gold deposit. Based on these observations，it can be inferred that the deep-seated regions of Dayingezhuang deposit hold considerable mineralization potential.

Key words: altered rock type gold deposit, numerical simulation, ore-forming fluid, ore-controlling factor, mineralization rate, Dayingezhuang gold deposit

CLC Number: 

  • P618.51

Fig.1

Distribution and regional geological map of gold deposits in Jiaodong Peninsula（modified after Yang et al.，2019；Deng et al.，2022）"

Fig.2

Geological map of Dayingezhuang gold deposit in Jiaodong （modified after Mao et al.，2019）"

Fig.3

Numerical simulation process of ore-forming process of Dayingezhuang gold deposit"

Fig.4

Variations of CAu(HS)2-e and its gradient equilibrium concentration with temperature and pore pressure"

Fig.5

Numerical simulation model of metallogenic period of Dayingezhuang gold deposit and its tectonic stress background"

Table 1

Rock parameters used in the simulation"

参数名称玲珑花岗岩断层破碎带胶东杂岩
密度/（kg?m–3）2 5802 5002 870
体积模量/（×1010 Pa）1.340.501.71
剪切模量/（×109 Pa）2.580.301.80
内聚力/（×107 Pa）5.704.705.30
抗拉强度/（×106 Pa）3.770.405.16
膨胀角/（°）3.204.705.30
摩擦角/（°）28.0014.8033.00
孔隙度/%20.0031.0021.00
渗透率/（×10-12）1.8010.002.50
热导率/（W?m–1?K–1）3.602.752.80

Fig.6

Simulated volumetric strain of typical exploration line profile of Dayingezhuang gold deposit and its corresponding profiles［Ⅰ（60）、Ⅱ（76） and Ⅲ（88）］"

Fig.7

Z-direction pore-fluid pressure gradient of typical exploration line profile of Dayingezhuang gold deposit and its corresponding profiles［Ⅰ（60）、Ⅱ（76） and Ⅲ（88）］"

Fig.8

Z-direction temperature gradient of typical exploration line profile of Dayingezhuang gold deposit and its corresponding profiles［Ⅰ（60）、Ⅱ（76） and Ⅲ（88）］"

Fig.9

Mineralization rate of typical exploration line profile of Dayingezhuang gold deposit and its corresponding profiles［Ⅰ（60）、Ⅱ（76） and Ⅲ（88）］"

Fig.10

Profile of No.70~No.90 exploration line （a） and its corresponding mineralization rate map（b） of Dayingezhuang gold deposit"

Fig.11

ROC curve between mineralization rate and known orebodies of Dayingezhuang gold deposit"

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