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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (4): 489-496.doi: 10.11872/j.issn.1005-2518.2019.04.489

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

Characteristics of Ore-controlling Structures and Prospecting Indicators in the Western Tungsten Deposit Area of Zhen’an,South Qinling

Yunfeng GAO1(),Xingke YANG1(),Shiqi RUAN1,Ke HAN1,Weisheng ZHANG1,Wei ZHU2   

  1. 1. School of Earth Science and Resources,Chang’an University,Xi’an 710054,Shaanxi,China
    2. Shaanxi Mineral Resources and Geoological Survey,Xi’an 710054,Shaanxi,China
  • Received:2018-07-20 Revised:2018-11-16 Online:2019-08-31 Published:2019-08-19
  • Contact: Xingke YANG E-mail:308647910@qq.com;xky6105@163.com

Abstract:

The western tungsten deposit area of Zhen’an is located in the south Qinling tectonic belt.The main exposed strata in the area are Paleozoic carbonate rocks.The magmatic rocks are mainly rouge dams,lazy benches and Sihaiping granite bodies.The fault development in the area provides a ore-conducting and ore-bearing structure for the tungsten ore formation in the area.The skarn-type tungsten mineralization occurred in the near EW strike fracture zone.In addition,the NE-NNE-oriented quartz vein-type tungsten mineralization also developed,which together constitute the main tungsten-molybdenum mineralization type in this area.This paper mainly conducts field investigation and indoor research on typical tungsten deposits such as Qipangou and Hetaoping in the mining area,and has obtained the following knowledge:(1)The ore-controlling structure in the ore-concentrating area is a tectonic fracture in two different directions from the EW and the NE-NNE direction.(2)According to the tectonic background of the area,the tectonic fractures in the NE-NNE of the ore-concentrating area are formed by the Late Indosinian-Yanshanian tectonic activities,and the near-east tectonic fractures are mainly formed by the Indosinian tectonic activities.Compared with the Yanshanian tungsten-molybdenum ore-forming period,the near-east-west fault is a pre-mineral structure,while the NE-NNE fault fracture belongs to the metallogenic structure.(3)The type of tungsten mineralization in the ore-concentrating area is mainly composed of hydrothermal quartz vein type and fault-controlled skarn type.The quartz vein type is mainly controlled by the NE-NNE fault and joint fissures, and the skarn type is mainly controlled by the near-east-west fault fracture zone.

Key words: ore-controlling structure, skarn type, quartz vein type, prospecting indicator, scheelite, western Zhen’an area, South Qinling

CLC Number: 

  • P618.51

Fig.1

Regional geological map of the study area"

Table 1

Orebody characteristics of typical deposits in the study area"

矿体编号 矿体规模 出露标高/m 产状 WO3平均品位/% 矿体类型 出露矿区
长度/m 厚度/m
W1 >900 5.48 607.40~572.66 35°∠75° 0.622 矽卡岩型 核桃坪
W2 >900 1.97 580.00~625.00 35°∠75° 0.421 矽卡岩型
地耳沟钨矿段 60~80 0.10~3.52 600~650 295°∠65° 0.226~1.64 石英脉型
K1 570 1.09 1 030~122 285°∠75° 1.08 石英脉型 棋盘沟
K2 160 0.46 1 100~117 270°∠73° 1.09 石英脉型

Fig.2

Geological map of the Hetaoping tungsten deposit"

Fig.3

Rose map of quartz vein trend in Hetaoping mining area"

Fig.4

Outcrop of Hetaoping mining area"

Fig.5

Geological section map of Hetaoping mining area"

Fig.6

Geological map of Qipangou mining area"

Fig.7

Characteristics of ore body in Qipangou mining area"

Fig.8

Geological section of Qipangou mining area"

Fig.9

Rose map of joint occurrence in Qipangou mining area"

Fig.10

Quartz veins(a) and tungsten mineralization(b) in the near-east and near-north-south fractures"

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