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Gold Science and Technology ›› 2023, Vol. 31 ›› Issue (3): 396-407.doi: 10.11872/j.issn.1005-2518.2023.03.134

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

Geological Characteristics and Genesis of Yudai Copper Deposit in Kalatag District，Eastern Tianshan

Lei CHEN1,2(),Baofu DUAN1,Dao LV1,Jianpeng ZENG1,Shuo ZHANG1,Xingfu ZENG1,Meijun HUANG3()   

  1. 1.School of Earth Science, East China University of Technology, Nanchang 330013, Jiangxi, China
    2.Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha 410083, Hunan, China
    3.Mineral Exploration Institute of Jiangxi Geological Survey and Exploration Institute, Nanchang 330038, Jiangxi, China
  • Received:2022-10-08 Revised:2023-02-20 Online:2023-06-30 Published:2023-07-20
  • Contact: Meijun HUANG E-mail:chenleicsu@163.com;154070698@qq.com

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Abstract:

Yudai copper deposit is a newly discovered and medium-sized copper deposit located in the Kalatag district，northern Dananhu-Tousuquan island-arc belt，eastern Tianshan，NW China.Through field geological survey and laboratory research，the geological characteristics and genesis of the deposit were discussed.The ore-bearing geological formation is a set of volcanic-pyroclastic rocks，and the orebody is hosted in the porphyritic quartz diorite and volcanic rocks of the Daliugou Formation.It is controlled by the faults and is mainly vein and lenticular type.The ore types are mainly disseminated and veined and the structures are mainly granular，disseminated and veined.The metal minerals are mainly chalcopyrite and pyrite，and the gangue minerals are mainly quartz，followed by chlorite and sericite.The ore-forming process can be divided into four stages，namely quartz-magnetite stage，K-feldspar-quartz-pyrite stage，quartz-pyrite-chalcopyrite-molybdenite stage and quartz-carbonate-gypsum stage.The hydrothermal alteration is characterized by K-feldspar，silica，chlorite，epidote，sericite and carbonate.The alteration is typically zoned from center to outer with K-feldspar-silica zone，silica-sericite zone，argillic zone and chlorite-epidote- carbonate zone，and K-feldspar-silica zone，silica-sericite-pyrite zone and chlorite-epidote-carbonate zone from top to bottom. The metallogenic geological conditions，ore body characteristics and hydrothermal alteration of the Yudai copper deposit are consistent with the porphyry copper deposit in the Dananhu-Tousuquan island-arc belt.Therefore，it is considered that Yudai copper deposit belongs to porphyry copper deposit.

Key words: porphyry copper deposit, geological characteristics, ore genesis, Yudai copper deposit, Kalatag district, eastern Tianshan

CLC Number: 

  • P618.41

Fig.1

Simplified tectonic map of the Central Asia Orogenic Belt and adjacent regions（a），sketch map of the tectonic units of North Xinjiang （b） and geological map of eastern Tianshan and the distribution of ore deposits（c）（Fig.a modified after Seng?r et al.，1993；Fig.b modified after Chen et al.，2012；Fig.c modified after Mao，2014）"

Fig.2

Regional geological map of Kalatage district（modified after Chen et al.，2017）"

Fig.3

Geological sketch map of Yudai copper deposit"

Fig.4

Section map and alteration zoning of the No.56 prospecting line in Yudai copper deposit"

Fig.5

Hand specimens and microscopic characteristics of ores in Yudai copper deposit"

Fig.6

Alteration zoning characteristics of trench in Yudai copper deposit"

Fig.7

Metallogenic stages and mineral growth sequences of Yudai copper deposit"

Fig.8

Vein type characteristics and interspersed relationship in the metallogenic stages of Yudai copper deposit"

Table 1

Comparison of the geological characteristics of the typical porphyry deposits in the Dananhu-Tousuquan island-arc belt"

矿床名称构造位置成矿时代赋矿围岩控矿构造成矿岩体矿体特征
土屋—延东大南湖—头苏泉岛弧带南缘石炭纪下石炭统中基性火山岩EW向区域性断裂和韧性剪切带斜长花岗斑岩厚板状、似层状，总体产状为180°∠43°~80°
灵龙—赤湖大南湖—头苏泉岛弧带南缘石炭纪下石炭统中基性火山岩EW向区域性断裂和韧性剪切带斜长花岗斑岩脉状、似层状
玉海大南湖—头苏泉岛弧带东缘志留纪无（矿区出露的新生代盖层与成矿作用无关）EW向区域性断裂和韧性剪切带花岗闪长岩似层状、透镜状，产状为166°∠10°
三岔口大南湖—头苏泉岛弧带东缘志留纪下石炭统粉砂岩、页岩、凝灰岩和砂岩等EW向区域性断裂和韧性剪切带花岗闪长斑岩脉状、透镜状，走向NE-SW
玉带大南湖—头苏泉岛弧带北缘志留纪中奥陶统中基性火山岩NNW和NE向断裂石英闪长玢岩脉状、透镜状，总体产状为210°∠55°~70°
矿床名称矿石结构构造金属矿物脉石矿物围岩蚀变矿床规模、品位资料来源
土屋—延东中细粒半自形—他形结构，浸染状、脉状构造黄铜矿、黄铁矿、斑铜矿、辉铜矿、辉钼矿石英、绢云母、绿泥石、高岭石、钾长石、方解石硅化、绢云母化、黑云母化、泥化、青磐岩化、碳酸盐化大型，铜品位为0.35%~0.86%Mao et al.，2022
灵龙—赤湖粒状结构，细脉状、浸染状构造黄铁矿、黄铜矿、斑铜矿、辉铜矿、辉钼矿石英、绢云母、绿泥石、绿帘石、方解石硅化、绢云母化、绿泥石化、绿帘石化、碳酸盐化小型，铜品位为0.10%~1.00%刘仲存等，2020
玉海他形粒状结构，细脉浸染状构造黄铜矿、黄铁矿、辉铜矿、辉钼矿石英、绢云母、绿泥石、绿帘石、方解石硅化、绢云母化、绿泥石化、碳酸盐化中型，铜品位为0.20%~2.18%张照伟等，2016
三岔口粒状结构，脉状、浸染状构造黄铜矿、辉钼矿、辉铜矿、黄铁矿石英、绢云母、绿泥石、绿帘石、方解石硅化、绢云母化、绿泥石化、碳酸盐化中型，铜品位为0.35%~2.34%王超等，2015
玉带粒状结构，浸染状、细脉状构造黄铁矿、黄铜矿、辉钼矿、斑铜矿石英、绢云母、绿泥石、绿帘石、方解石钾化、硅化、绢云母化、泥化、青磐岩化、碳酸盐化中型，铜品位为0.08%~1.02%Chen et al.，2017
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