内蒙古安乐锡多金属矿床特征及成矿模式

安乐锡多金属矿床产于地球构造变异带幔洼区，主矿体赋存在压性构造透镜体外缘断裂中，呈复合脉产出。矿区次火山岩和侵入角砾岩发育。锡石稀土元素特征与基性—超基性岩中镍矿有相似之处。矿床可能是含锡多金属的上地幔（或硅—镁层）物质部分熔融的流体多期次喷贯到断裂中成矿。构造变异带幔洼区中多期次活动的断裂，次火山岩和侵入角砾岩发育地段的锡多金属异常，复杂矿物组合的地质体为其找矿标志。

GEOLOGICAL FEATURES AND METALLOGENIC MODEL OF ANLO TIN POLYMETALLIC DEPOSIT IN INNER MONGOLIA

Anlo tin polymetallic deposit exists in depression area of the tectonic variation belt,the main ore body of which is located in the faults outside the compressive strueture lens and occurs as the forms of multiple veins.In Anlo region,Subvolcanic rocks and intrusive breccia are wildly distributed,the REE characteristics of cassinite is alike to that of nickle deposit in basic ultrabasic rocks,so the deposit probably is finally formed with the fluid,which comes from partial melting of upper mantle (or Si-Mg strata) rich in tin polymetals,injecting into the faults multiperiodically.The criteria for ore prospecting include the revived faults in the depression area of tectonic variation belt,the tin polymetallic anomalies in the area rich in subvolcanic rocks and intrusive breccia and geological body with complicated mineral compositions.