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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (6): 706-717.doi: 10.11872/j.issn.1005-2518.2018.06.706

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Geological Characteristics and Ore-controlling Factors of Liyuan Gold Deposit, Shanxi Province

Peijiao JU1,2()   

  1. 1. School of Earth Sciences,East China University of Technology,Nanchang 330013,Jiangxi
    2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment MonitoringCentral South University,Ministry of Education,Changsha 410083,Hunan
  • Received:2018-03-16 Revised:2018-09-04 Online:2018-12-31 Published:2019-01-24

Abstract:

Liyuan gold deposit is located in the tectonic-magmaic-polymetallic metallogenic belt of Taihang Mountain.The outcropping strata are mainly banded gneiss and amphibolite of Neo-Archean Fuping Group. The orebody is generally hand-shaped and mainly occurs in the NNE-trending structural zone.The metal minerals in ore are mainly pyrite,followed by galena,sphalerite and chalcopyrite.The non-metallic minerals are mainly quartz, potassium feldspar, plagioclase and sericite.The precious metal is natural gold (silver-gold ore). The wall-rock alteration closely related to gold mineralization are mainly silicification,sericitization and pyrite mineralization.The formation of the deposit can be divided into two episodes,including hydrothermal episode and epigenetic episode.The hydrothermal episode is the main mineralization period,which can be divided into four stages,namely,quartz silification stage,quartz-pyrite stage,quartz-sulfide stage and quartz-carbonate stage.Based on field geological survey and indoor analysis,the ore-bearing wall-rocks and strutural ore-controlling raw were summarized,the prospecting mark was specified,and the metallogenic process was preliminarily analyzed. It is considered that Liyuan gold deposit belongs to magmatic hydrothermal altered rock type gold deposit controlled by fracture zone.The results provide certain scientific basis for gold prospecting in this area.

Key words: geological characteristics, orebody characteristics, ore-controlling factors, mineralization stage, metallogenesis, Liyuan gold mine, Shanxi Province

CLC Number: 

  • P612

Fig.1

Geological map of Liyuan gold deposit"

Fig.2

Morphological characteristics of orebodies in each middle section"

Fig.3

Characteristics of orebody boundary"

Fig.4

Micrograph of natural gold (silver gold)"

Table 1

Electronic probe composition of gold"

序号 Au Ma Cu Ka Ag La Te La Sb La Bi Ma Total
1 59.453 0 35.695 0.080 0 0.540 95.769
2 66.731 0.033 30.550 0.073 0 0.581 97.968
3 66.274 0 31.344 0.063 0 0.465 98.145
4 65.469 31.130 0.005 96.604
5 67.769 30.536 0.037 98.342
6 61.231 31.379 0.115 0.558 93.283
7 63.312 31.830 0 0.401 95.542
8 61.637 31.574 0.047 0.604 93.861
9 63.740 29.374 0.044 0.487 93.645
10 58.348 36.092 0.064 0.379 94.883
11 61.271 30.723 0.063 0.445 92.502
12 62.567 28.751 0.063 0.416 91.798
13 60.407 0.043 36.453 0.109 0 0.390 97.403

Table 2

Atomic percentage of each element(%)"

序号 Au Ma Cu Ka Ag La Te La Sb La Bi Ma Total
1 47.461 0 52.033 0.099 0 0.406 100
2 54.131 0.083 45.251 0.091 0 0.444 100
3 53.428 0 46.14 0.078 0 0.354 100
4 53.523 46.471 0.006 100
5 54.836 45.118 0.046 100
6 51.355 48.055 0.148 0.441 100
7 51.976 47.714 0 0.31 100
8 51.393 48.072 0.06 0.474 100
9 54.061 45.492 0.058 0.389 100
10 46.788 52.846 0.079 0.287 100
11 51.974 47.588 0.083 0.356 100
12 54.144 45.432 0.085 0.339 100
13 47.326 0.105 52.149 0.132 0 0.288 100

Fig.5

Electron probe analysis diagram of silver gold"

Fig.6

Microscopic characteristics of pyrite"

Fig.7

Microscopic characteristics of other metallic minerals"

Fig.8

Characteristics of ore texture and structure"

Fig.9

Alteration characteristics of wall-rock"

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