大吉山钽铌钨矿床地质特征及找矿模型

大吉山钽铌钨矿位于3组构造复合部位,矿体赋存于燕山期白云母花岗岩中,形态产状与岩体一致,矿石矿物成分复杂,主要组分Ta2O5、Nb2O5含量变化简单、均匀,WO3含量变化复杂、不均匀,表现为富矿巢特点.构造控岩控矿作用和燕山期重熔型花岗岩成岩成矿演化是主导成矿作用,与石英脉型钨矿床在成因、时空间密切联系,可概括为"五层楼"加"基座"式找矿模型.

GEOLOGICAL CHARACTERISTICS AND PROSPECTING MODEL OF DAJISHAN NIOBIUM-TANTALUM-TUNGSTEN DEPOSIT

Dajishan niobium-tantalum-tungsten deposit is located in the compound site of three suites of structures. Orebodies occurred in muscovite granite body like rich-nest, and its occurrence and shapes are consistent with the body. Ore compositions are complex. Primary compositions are Ta_2O_5, Nb_2O_5 and WO_3. Content of Ta_2O_5 and Nb_2O_5 is homogeneous, but content of WO_3 is not. Main mineralization factors are ore-controlling and magma-controlling structures and Yanshanian remelting granitoid evolution. Niobium-tantalum-tungsten mineralization has tight relations with quartz vein type tungsten mineralization in genesis, apace and time. Prospecting model can be concluded as "five-story" plus "pedestal".