内蒙古孟恩陶勒盖银铅锌铟矿床的微量元素地球化学  

TRACE ELEMENT GEOCHEMISTRY OF MENG'ENTAOLEGAI Ag-Pb-Zn-IN DEPOSIT,INNER MONGOLIA, CHINA

作　　者：张乾[1] 刘志浩[1] 战新志[1] 邵树勋[1] 

机构地区：[1]中国科学院地球化学研究所,贵州贵阳550002

出　　处：《矿物学报》2004年第1期39-47,共9页Acta Mineralogica Sinica

基　　金：国家自然科学基金项目(批准号:40172037)

摘　　要：孟恩陶勒盖银铅锌铟多金属矿床位于内蒙古东部,是产于海西期酸性岩浆岩体内部的热液脉状矿床,40多个矿体分布于东西长6km、南北宽200～1000m的范围内,成矿温度西高东低。矿床有用组分以Pb、Zn为主,伴生有Ag、Sn、In和Ga,其中Ag1800t,Sn2000多t,In400多t,Ga100多t,构成一个典型的多金属矿床。一部分Ag以银矿物形式存在,另一部分Ag存在于方铅矿和闪锌矿中。除锡石和黄锡矿外,方铅矿也含有较高的锡。In和Ga主要存在于闪锌矿中。矿石中w(Ag)=82×10-6～516×10-6,w(Cd)=94×10-6～1430×10-6,w(In)=12×10-6～295×10-6,w(Ga)=3×10-6～82×10-6;方铅矿中w(Ag)=1580×10-6～4995×10-6,w(Sn)=735×10-6～2785×10-6,In和Ga很低;闪锌矿中w(Ag)=280×10-6～2030×10-6,w(Cd)=0 18%～0 44%,w(In)=85×10-6～2660×10-6,w(Ga)=11×10-6～155×10-6。从西向东,Sn和In含量降低,Ag和Ga含量增高。这一变化与成矿温度由西向东的降低一致。The Meng'entaolegai Ag-Pb-Zn-In polymetal deposit is located in the eastern part of Inner Mongolia and occurs as a hydrothermal vein deposit within a Hercynian acidic magmatic massif. More than 40 orebodies are distributed in an area measuring 6 km in length from east to west and 200 m to 1000 m in width from south to north. The ore-forming temperatures tend to decrease from west to east. The useful constituents of the deposit are dominated by Pb and Zn, associated with Ag, Sn, In and Ga, of which Ag accounts for 2000 t; Sn, >2000 t; and Ga, >100 t, constituting a typical polymetal deposit. A part of Ag occurs as silver minrals, and the rest of it is present in galena and sphalerite. In addition to cassiterite and stannite, galena also contains a high amount of tin. In and Ga are present largely in sphalerite. The ore contains 82×10^(-6) to 516×10^(-6) Ag, 94×10^(-6) to 1430×10^(-6) Cd, 12×10^(-6) to 295×10^(-6) In and 3×10^(-6) to 82×10^(-6) Ga; galena contains 1580×10^(-6) to 4995×10^(-6) Ag, 735×10^(-6) to 2785×10^(-6) Sn, and is extremely low in In and Ga; sphalerite contains 280×10^(-6) to 2,030×10^(-6) Ag, 0.18% to 0.44% Cd, 85×10^(-6) to 2260×10^(-6) In and 11×10^(-6) to 155×10^(-6) Ga. From west to east the contents of Sn and In tend to decrease while those of Ag and Ga tend to increase. This variation trend is in consistency with the decrease of ore-forming temperature from west to east.

关 键 词：微量元素 地球化学 多金属矿床 地质特征 岩浆岩 

分 类 号：P618.7[天文地球—矿床学] P595[天文地球—地质学]