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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (1): 25-32.doi: 10.11872/j.issn.1005-2518.2019.01.025

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Intergrated Geophysical Constraint to the NW-trending Fault Zone in the Xiling Gold Deposit，Sanshandao，Shandong Province

Shipeng LIU,Shuya WANG,Xinxin FENG,Chuanyin YIN   

  1. 1. Shandong Gold Geology and Mineral Resources Co. ，Ltd. ，Laizhou 261400，Shandong，China
  • Received:2017-08-20 Revised:2018-03-29 Online:2019-02-28 Published:2019-03-19

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Abstract:

The Xiling gold deposit of Sanshandao is located in the coast of Bohai sea.It connected with the north sea area gold deposit and they explore a huge gold deposit of nearly 1 000 t of gold resources.The deposit need to be mined underground and undersea.The faults in the region are well developed and distributed in NE and NW directions.The NE-trending faults are ore-controlling structures.The NW-trending faults in the region have different degrees of water conductivity，it has a great impact on the safe mining of the deposit，so it is very important to ascertain the spatial distribution of the NW trending faults.In view of geological conditions and geophysical characteristics of the area，the exploration test in the east of mining area by using high precision magnetic method and audio magnetotelluric （AMT） method to conducted.According to the magnetic anomalies and electrical anomalies，the NW-trending faults F-1，F-2 and NE-trending faults F-3 and F-4 were interpreted in plane，four faults were interpreted in L1 section and three faults were interpreted in L2 section.Comprehensive judgment interpretation information shows that the NW-trending F-1 fault responds well both in plane and profile.Comparing with the NW trending structure research data in the north sea area，the results show that F-1 fault of Xiling gold deposit was agree well with B-F4 fault of north sea features.It is inferred that the NW-trending F-2 fault in Xiling mining area is broken by the F-3 fault.The study shows that the comprehensive geophysical prospecting method in the area is feasible and effective.It provide a geophysical evidence for verifying the existence of the new fault structure and judging the water-rich and water-conducting properties of the fault for the next drilling，also provided the basis for future development and utilization of mineral deposits.

Key words: integrated geophysical exploration, fault, Xiling gold deposit, Sanshandao, Jiaodong, seabed mining, Audio-frequency Magneto Tellurics(AMT)

CLC Number: 

  • P618.51

Fig.1

Regional structure distribution map"

Table 1

Statistical table of physical properties of rock and ore in Xiling gold mine"

岩性 块数 电阻率ρ/（Ω·m） 磁化率K（4π×10-6SI） 剩余磁化强度Jr（×10-3A/m）
平均值 变化范围 平均值 变化范围 平均值 变化范围
二长花岗岩 15 2970 203～8 100 147 6～288 17 0～45
花岗闪长岩 108 4250 625～7 470 348 0～2 188 145 0～838
斜长角闪岩 188 319 50～606 923 26.8～35 960 267 0～9 225
黑云斜长片麻岩 54 941 116～3 060 570 0～1 480 100 0～500
黑云变粒岩 30 - - 52.4 0～859 9.27 0～197
黑云母片岩 30 559 237～1 090 23 0～235 14 0～357

Fig.2

High precision magnetic ? T contour map of Xiling mine"

Fig.3

L1 profile resistivity inversion section by audio-frequency magentotelluric sounding（AMT）"

Fig.4

L2 profile resistivity inversion section by audio-frequency magentotelluric sounding（AMT）"

Fig.5

Schematic diagram of Xiling geophysical and northern sea inferred fault gold mining area"

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