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Gold Science and Technology ›› 2020, Vol. 28 ›› Issue (6): 825-836.doi: 10.11872/j.issn.1005-2518.2020.06.097

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

Characteristics of the Ore-control Structure in the Zhaishang Gold Deposit in Western Qinling Region

Bin ZHANG1(),Jiajun LIU1,2   

  1. 1.School of Earth Sciences and Resources，China University of Geosciences （Beijing），Beijing 100083，China
    2.State Key Laboratory of Geological Processes and Mineral Resources，China University of Geosciences（Beijing），Beijing 100083，China
  • Received:2020-06-01 Revised:2020-07-05 Online:2020-12-31 Published:2021-01-29

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Abstract:

During the 1990s，with the deepening of research and exploration of carlin-type gold deposit in China on the basis of the connotation of carlin-type gold deposit，some gold deposits were discovered and redefined as carlin-like gold deposits.This is a class of gold deposits that show similar geological characteristics to the carlin-type gold deposit，but their geochemical characteristics are obviously different.The Zhaishang gold deposit located in the western part of the Li-Min metallogenic belt within the western Qinling Mountains is a very important carlin-like disseminated gold deposit.Since it was discovered through geochemical anomaly information and civil mining information in 2 000，many workers have carried out geological，geochemical，geophysical，remote sensing，engineering and other aspects of exploration，as well as researches on mineral composition，texture and structure of rock，orebody distribution，fluid source and ore-forming conditions，showing the superior metallogenic geological conditions and great prospecting potential of the deposit.Based on a large number of field work data and analysis of ore-forming characteristics in the mining area，we mainly studied the No.31 vein and the Zhamashu ore section in the South ore belt，taking the measurement and analysis of structural traces of different scales as the basis.On the basis of the analysis of the ore control law of the structure，the “three in one” ore-forming model of ore-forming geological body，ore-forming structure，ore-forming structural plane and ore-forming characteristics was summarized to guide the prospecting systemati-cally.The results of field observation and statistical analysis on the structural fissures of the Zhaishang gold deposit show that the most developed joints are in the NW-SE direction of 106°~137°，and the joints in the NE-SW direction of 196°~229° come second.It is indicated that the SN-trending compressive stress in Indosinian period，which is an important structural period of the gold deposit，formed most of the joint fractures of the deposit.And the deposit is mainly formed in Indosinian and Yanshanian tectonic movements，the orebody is controlled by folds，faults and strata.In Yanshanian period the deposit was mainly controlled by NE-trending positive torsional stress，which led to the successive activity of NW-trending structure formed in the Indosinian period，the emplacement of magmatic hydrothermal fluid along fractures，the mixing of atmospheric precipitation，and the superimposition of mineralization on the early orebodies.

Key words: structural features, analysis of joints, metallogenic model, carlin-like gold deposit, Zhaishang gold deposit, western Qinling Mountains

CLC Number: 

  • P618.51

Fig.1

Geological structure and gold deposit distribution map of the West Qinling and its adjacent areas （modified after Du[19] and Yu[20]）"

Fig.2

Geological map of the Zhaishang gold deposit（modified after Liu, et al[24]）"

Fig.3

Characteristic of ore textures in the Zhaishang gold deposit（All microphotographs are in reflected light，according to Liu et al[28]）"

Fig.4

Geological cross-section map of the Zhaishang gold deposit（modified after Liu,et al[24] and cross-section of geological map in Zhaishang area）"

Fig.5

Fold structure in the Zhaishang area"

Fig.6

Joint analysis diagram of the Zhaishang gold deposit"

Fig.7

Fracture structure in the Zhaishang gold deposit"

Fig.8

Tectonic-metallogenic model of the Zhaishang gold deposit"

Fig.9

Outcrop and microscopic micrograph of altered diorite porphyrite（modified after Meng[11]）"

Fig.10

Metallogenic stage diagram（modified after Meng[11]）"

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