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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (6): 718-728.doi: 10.11872/j.issn.1005-2518.2018.06.718

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Metallogenic Characteristics and Metallogenic Model of the Gold Deposits in Huisenwulaxi Area of Ejin Banner,Inner Mongolia

Jie XIN1,2(),Wentian MI1,2,3,4,5,*(),Yuqing GUAN1,Zhong XI6,Xuesong ZHANG1   

  1. 1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Central South University,Changsha 410083,Hunan,China
    2. Key Laboratory of Geoscience Spatial Information Technology of Ministry of Land and Resources,Chengdu University of Technology,Chengdu 610059,Sichuan,China
    3. Geomathematics Key Laboratory of Sichuan Province,Chengdu University of Technology,Chengdu 610059,Sichuan,China
    4. Sichuan Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,Sichuan,China
    5. School of Mines,Inner Mongolia University of Technology,Hohhot 010051,Inner Mongolia,China
    6. Inner Mongolia First Geological Mineral Exploration Institute,Hohhot 010020,Inner Mongolia,China
  • Received:2018-01-14 Revised:2018-06-23 Online:2018-12-31 Published:2019-01-24
  • Contact: Wentian MI E-mail:xinjie1990@126.com;miwentian1982@163.com

Abstract:

The Huisenwulaxi gold deposit,located in the northern Alxa block,is a prospective area with great potential for exploration.It has important geological significance to discuss the metallogenic characteristics and metallogenic model of the gold deposit.By summarizing the geological characteristics of the deposit,regional geochemical characteristics,results of fluid inclusions and trace elements,preliminary discussions was conducted on the genesis and metallogenic model of the gold deposit.Geochemical and trace element data revealed that the Huisenwulaxi area is characterized by the high gold background content.Permian Ha’ersuhai Formation has played a role of a mineral source layer.The study of fluid inclusion indicated that the temperature of mineralization was between 240 ℃ and 260 ℃,which was an moderate temperature environment.Folds,schistositized zone and structural fractural zone in the area composed the ore-conducting tectonic and ore-containing tectonic.Huisenwulaxi gold deposit is altered rock type gold deposit.Affected by meso temperature magmatic hydrothermal.The metallogenic model of gold deposit is early preliminary enrichment of gold and the initial formation of primary source bed when the crusts of ancient Mongolia sea subducted to Alxa block,along with the magmatic instrusion of the late Permian,the remobilization,migration and enrichment of gold,secondary enrichment of gold deposits occurred in the late stage under the influence of structural deformation and weathering denudation.

Key words: trace elements, fluid inclusion, Permian, gold deposit, metallogenic characteristics, metallogenic model, Huisenwulaxi, Inner Mongolia

CLC Number: 

  • P618.51

Fig.1

Tectonic location and geological sketch map of northern Alxa block(modified by Zhang, et al[13])"

Fig.2

Geological map of Huisenwulaxi gold deposit"

Fig.3

Typical mineralized alteration zone and rock sample photo of Huisenwulaxi gold deposit"

Table 1

Characteristics of orebodies in the Huisenwulaxi gold deposit"

矿化蚀变带(含金矿化带)编号 矿体编号 矿体规模 产状 Au平均品位/(×10-6
长度/m 平均厚度/m 走向/(°) 倾向/(°) 倾角/(°)
HSP1 Au1-1 170 1.48 180° 270° 85° 1.51
Au1-3 65 0.86 170° 260° 83° 1.22
Au1-4 80 0.95 170° 260° 79° 1.00
HSP1-1 Au1-5 75 0.95 170° 260° 80° 1.06
HSP2 Au2-1 510 1.22 190° 280° 78° 3.60
Au2-2 430 1.28 194° 284° 82° 1.85
Au2-3 75 0.99 205° 295° 87° 16.39
HSP3 Au3-1 70 2.15 175° 265° 85° 1.38
HSP5 Au5-2 60 0.98 40° 130° 76° 1.15
Au5-3 55 0.97 40° 130° 75° 1.12
Au5-5 145 0.59 40° 130° 65° 2.16
Au5-6 90 0.82 36° 126° 68° 11.26
Au5-7 360 1.94 36° 126° 68° 2.50
Au5-8 90 0.87 38° 128° 72° 1.22
Au5-9 130 0.97 40° 130° 65° 25.21
Au5-10 150 0.96 44° 134° 83° 1.21
Au5-11 90 0.89 220° 310° 75° 1.76
HSP6 Au6-1 70 0.93 195° 285° 65° 1.15
HSP9 Au9-2 70 4.64 210° 300° 75° 1.28

Table 2

Homogeneous temperature analysis results of quartz vein in the Huisenwulaxi gold deposit"

样品编号 赋存矿物 大小/μm 气液比/% 盐度[w(NaCl)]/% 均一温度/℃
AP6-Q1L 石英脉 4×6~7×12 20~30 1.06~15.47 183~318(28)
AP6-Q2L 石英脉 3×5~6×10 25~30 1.47~5.71 242~358(31)
AP6-Q3L 石英脉 4×4~6×12 20~25 2.90~11.93 210~411(27)
AP6-Q4L 石英脉 3×3~6×6 20~25 3.87~6.74 227~375(19)
AP6-Q5L 石英脉 2×5~5×10 25~35 3.39~7.31 279~377(18)

Fig.4

Microphotograph showing the characteristics of fluid inclusion in the Huisenwulaxi gold deposit"

Fig.5

Temperature histogram of fluid inclusions"

Fig.6

Salinity histogram of fluid inclusions"

Fig.7

Scatter plot of temperature-salinity of fluid inclusions"

Table 3

Measurement results of mineral elements of metallogenic deposit rocks in the Huisenwulaxi gold deposit(×10-6)"

样品编号 微量元素及含量
Be Sr Y Nb Ba La Ce Pr Nd Sm Eu Gd Dy Re Pb U Zr Hf Au
AP2-02 4.87 2021 56.4 184 763 342 607 67.8 237 33.4 9.72 27.3 13.7 0.009 32.6 7.8 1415 31.6 0.008
AP6-01 7.36 591 48.4 253 1380 258 441 47.1 163 24.5 7.51 21.4 12.3 0.007 16.9 11.2 570 19 0.03
AP6-03 2.11 653 40.7 122 782 245 448 49.6 179 24.5 6.95 20.3 10.2 0.005 25.9 7.96 592 16 0.043
AP8-01 0.67 163 9.76 5.26 2315 15.8 29.5 3.45 12.5 2.24 1.03 2.05 1.32 0.001 10.6 1 135 5.77 0.019
AP9-03 2.55 56.9 16 10.5 426 33.8 64 7.56 27.2 5.06 0.64 3.91 3.39 0.002 31.5 3.48 145 5.14 0.003

Fig.8

Schematic diagram of tectonic evolution in the study area"

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