摘要
东山铜(金)矿位于新疆准噶尔盆地东南部,哈尔里克古生代复合岛弧带东段,带内矿床成因类型研究程度较低,南北两侧岛弧带内近年均发现较大规模斑岩型铜矿。东山铜金矿体呈脉状、网脉状产于花岗斑岩体边部花岗闪长岩节理裂隙中,矿石矿物主要有黄铜矿、黄铁矿、磁铁矿、赤铁矿等,与典型斑岩型铜矿类似。主要含矿岩体花岗闪长岩SiO_2、Al_2O_3、MgO含量分别为64.3%~68.15%,15.6%~16.6%,1.29%~1.69%。岩体Y和Yb含量低但具较高的Sr值,具埃达克岩特征;岩体大离子亲石元素Rb,Ba,U,K等元素相对富集,高场强元素Nb,Ta,Zr等相对亏损,具明显的Nb,Ta,Ti负异常特征,表明其形成于岛弧环境。埃达克岩和岛弧环境是新疆北部斑岩型铜矿的两个典型特征,本文通过矿床地质特征及含矿岩体地球化学特征研究,对比东山铜(金)矿与新疆北部斑岩型铜矿的成矿特征及构造环境,认为东山铜(金)矿的矿床成因类型应为斑岩型铜金矿床且区内具斑岩型铜矿的成矿潜力。
The Dongshan Cu (Au) deposit is located in the southeastern part of the Junggar Basin in Xinjiang, belong- ing to the eastern part of the Harlike Paleozoic island arc belt.The genetic type of ore deposits in the belt is relatively low, and in recent years, near by the belt many large scale porphyry copper deposits have been found. This paper is of certain significance for finding porphyry copper deposits in the belt. The orebodies are produced in the fissures of grano- diorite in the striped type or in vein. The ore minerals are composed of chalcopyrite, pyrite, magnetite and hematite, is similar to typical porphyry copper deposits. The SiO2, Al2O3 and MgO content of the ore-contained granite-diorite is 64.3% - 68.15%, 15.6% - 16.6% and1.29% - 1.69%, respectively. The grnite-diorites axe charactered by high Sr content and the low content of Y and Yb, meaning this rocks may be adakite. The granite-diorites are enriched in Ta, U, K and other large ion lithophile elements, lost in field strength elements Nb, Ta and Zr, and have significant Nb, Ta and Ti negative anomaly, indicating that the rocks were formed in island arc environment. The adakite and island arc environ- ment are two typical characteristics of porphyry copper deposits in northern Xinjiong. This paper do the research of geo- logical characteristics of the deposit and the geochemical characteristics. By comparing the metallogenic characteristics and tectonic setting of the Dongshan Cu(Au) deposit with the northern porphyry Cu deposit in the northern part of Xinjiang, we infer that this study area have the mineralization potential of the porphyry copper deposit and the Dongshan Cu (Au) is a porphyry-type Cu(Au) deposit.
作者
朱西奎
孙韶栋
路通
邢伟伟
曾华栋
郑媛媛
Zhu Xikui;Sun Shaodong;Lu Tong;Xing Weiwei;Zeng Huadong;Zheng Yuanyuan(No.6 Geological Survey Team,Bureau of Xingliang Geological Exploration,Hami,Xinjiang,839000,China;Hebei Institute of Regional Geological and Mineral Resource Survey,Langfang,Hebei,065000,China)
出处
《新疆地质》
CAS
CSCD
北大核心
2018年第3期335-341,共7页
Xinjiang Geology
基金
中央返还新疆两权价款项目新疆伊吾县下马崖东一带1:5万(K46E005024
K46E006022
K46E006023
K46E006024
K47E006001)五幅区域地质矿产调查(T15-1-LQ21)