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Gold Science and Technology ›› 2023, Vol. 31 ›› Issue (2): 262-270.doi: 10.11872/j.issn.1005-2518.2023.02.129

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Study on Rare Earth Mineralization Characteristics of Kuzigan Alkaline Complex in West Kunlun

Zuohuai YANG1,2(),Yanqin GUO1,3(),Shichao LU2(),Liu’an DUAN4,Zhengwei LI2,Xiaoyong LI2,Yanqiang WEI2,Fei SU2,Guoliang YANG2   

  1. 1.College of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an 710065, Shaanxi, China
    2.Urumqi Comprehensive Survey Center on Natural Resources, China Geological Survey, Urumqi 830057, Xinjiang, China
    3.Key Laboratory of Shaanxi Province for Petroleum Accumulation Geology, Xi’an 710065, Shaanxi, China
    4.Yantai Coastal Geological Survey Center, China Geological Survey, Yantai 264001, Shandong, China
  • Received:2022-09-28 Revised:2022-12-09 Online:2023-04-30 Published:2023-04-27
  • Contact: Yanqin GUO,Shichao LU E-mail:cgs-yzh@foxmail.com;guoyanqin@ xsyu.edu.cn;lu-shichao@foxmail.com

Abstract:

Kuzigan alkaline intrusive complex is the largest Cenozoic alkaline complex in the Taxkorgan area of West Kunlun.In recent years,the research on the Kuzigan alkaline complex has mainly focused on the formation age of the rock mass and the source of magmatic materials,but little research has been done on its rare earth mineralization characteristics.Based on the geological background and petrochemical characteristics of Kuzigan complex,the metallogenic characteristics of this type of rare earth ore in Kuzigan area were discussed by means of field investigation,microscopic identification and main trace element analysis.Three samples were taken from aegirine syenite and one contrast sample was taken from syenogranite.The results show that the total rare earth content of all kinds of rocks in the alkali metasomatic rare earth ore of Kuzigan is rich,mainly manifested as Ce and Y enrichment,and positively correlated with F.The REE content of syenite varies from 888.05×10-6 to 1 320.17×10-6,and it is enriched in light rare earth elements(LREE/HREE=13.54~19.65).The curves in the REE chondrite normalized diagram is generally right-leaning,and the differentiation degree of LREE and HREE is not large as a whole.No obvious anomalies of Eu and Ce are found,which has the common characteristics of alkaline syenite.The range of LREE fractionation parameter (La/Sm)N is 3.80 to 26.75.The HREE fractionation degree parameter (Gd/Yb)N varies from 2.94 to 7.98,indicating that the syenite has slight fractionation on both light and heavy rare earths,but the fractionation degree of light rare earth is greater than that of heavy rare earth.The ore-bearing rock of rare earth ore(mineralization) in the Kuzigan alkaline complex is medium-grained aegirine syenite,which contains accessory minerals such as fluorite,apatite and monazite,and is located near the internal contact zone with medium-grained quartz syenite,the two are in gradual contact.The Kuzigan alkaline complex has high REE content and strong LREE enrichment,which is mainly characterized by enrichment of light rare earth elements such as Ce and Y,and is positively correlated with F.It has the prospect of finding alkaline metasomatic rare earth deposits,and should focus on strong potassic,aegirine and carbonate alteration zones.

Key words: metallogenic characteristics, rare earth, alkaline complex rock mass, Kuzigan, West Kunlun

CLC Number: 

  • P618.7

Fig.1

Regional geological tectonic map and mineral distribution map of Taxkorgan area(modified after Li et al.,2018)"

Table 1

Geological characteristics of regional intrusive rocks"

代号岩体名称岩石名称结构构造同位素年龄岩体位置构造环境
ξ6苦子干碱性岩体斑状中粒霓辉正长岩、细粒石英正长岩斑状、半自形粒状结构,块状构造

U-Pb (SHRIMP):11 Ma

U-Pb(ICP-MS):(11.74±0.22)Ma

K-Ar(全):(33.6±0.7)Ma

K-Ar(长石):18.045 Ma

塔县辛滚沟口—迭依布依沟一带板内
ηγ6苏巴什—卡日巴生岩体斑状中粒二长花岗岩、细粒黑云二长花岗岩似斑状、细—中粒花岗结构,块状构造

U-Pb(ICP-MS):(13.99±0.76)Ma

K-Ar(Bi):9.795 Ma,17 Ma

向北延伸出图,向西出边境,辛滚沟以北板内
γ53-2布依阿勒岩体细粒花岗岩细粒花岗结构,块状构造塔什库尔干南30 km布依阿勒一带
δο53-2阿提牙依勒岩体细粒石英闪长岩半自形粒状结构,块状—定向构造塔县铁克晒克力克东—阿提牙依勒沟西和帕日帕克沟口南东一带
ηγ53-1阿然保泰岩体细粒二云二长花岗岩细粒花岗结构,块状—微定向构造

U-Pb(ICP-MS):(118.1±1.7)Ma

U-Pb(Zr):(123±14)Ma

K-Ar(Bi):94.2 Ma

塔什库尔干西南阿然保泰周围,西延出边境板内
阔克加尔亚温岩体斑状细中粒黑云二长花岗岩似斑状结构,块状—定向构造塔县达布达尔西边境线一带的高山地带
δο53-1格林阿勒岩体细粒石英闪长岩细粒半自形粒状结构,块状—定向构造塔县达布达尔北西的格林阿勒—达斯特亥依孜沟一带板内
γο52辛滚沟灰白色细粒英云闪长岩细粒花岗结构,块状—定向构造塔县辛滚沟两侧

Fig.2

Characteristics of Kuzigan alkaline complex"

Fig.3

Microscopic characteristics of aegirine syenite minerals (orthogonal polarization)"

Table 2

Chemical analysis results of silicate rock(×10-6)"

样品编号稀土元素
LiYLaCePrNdSmEuGdTbDyHoErTmYbLuThF
21-TX-1-0415.586.121954575.5318.057.6014.3043.505.7922.103.468.720.905.450.8448.11 966
21-TX-1-0543.762.819855282.5341.055.9013.1039.104.6415.802.376.330.624.110.7338.01 847
21-TX-1-0634.033.816438151.2205.034.708.1324.302.839.131.253.220.281.730.2652.8995
21-TX-2-0110.321.917623620.558.36.582.157.790.894.080.822.500.352.650.592.49589

Fig.4

Correlation diagram between light rare earth mineralization( Ce ) and F in Kuzigan alkaline complex"

Fig.5

Standardized diagram of REE chondrites of Kuzigan alkaline complex(normalized value from Sun et al.,1989)"

Table 3

Rare earth element analysis results of Kuzigan alkaline complex"

样品编号∑REELREEHREELREE/HREELaN/YbNδEu(1)δCe(1)δEu(2)δCe(2)
21-TX-1-041 320.171 229.3590.8313.5427.070.840.590.870.59
21-TX-1-051 316.091 242.4173.6816.8632.550.811.040.850.64
21-TX-1-06888.05845.0543.0019.6564.150.810.990.860.54
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