准噶尔北缘典型金矿床的稀土元素地球化学特征

准噶尔北缘存在浅成低温热液型金矿床、韧性剪切带蚀变糜棱岩型金矿床及浅成岩-构造蚀变岩型金矿床等主要矿化类型．通过分析比较这些主要矿化类型金矿的REE资料,建立了各典型金矿床的REE配分模式,探讨了各矿化类型金矿床之间的REE地球化学行为差异及其与成矿的关系．结果表明,就成矿作用而言,浅成岩-构造蚀变岩型金矿床比较简单,韧性剪切带蚀变糜棱岩型金矿床较复杂,浅成低温热液型金矿最复杂．

REE geochemical characteristics of some typical gold deposits in northem margin Junggar

In northern margin of Junggar, there are some basic metallurgical types of gold deposits named epithermal gold deposits, altered mylonite type gold deposits related to ductile shear zone, hypabassal and structeral altered rocks type gold deposits, and so on. By analyzing and comparing its REE date related to these typical gold deposits, some chondrite normalized REE distribution patterns for these gold deposits are established and the differences in REE geochemical action related to gold deposits and its relationship between gold mineralization and REE characteristics are discussed. The differences of REE actions of different gold deposits mean that their mineralizing process and forming environment are different. It has been thought that the mineralization of hypabassal and structural altered rocks type gold deposits is relatively simple, the altered mylonite type gold deposits related to ductile shear zones is more complicated, and the epithermal gold deposits is the most complicated one to their REE geochemical features. The mineralizing process of hypabassal and structural altered rocks type gold deposits is mainly controlled by its host intermediate acid hypabassal complexes and correlative regional metamorphism, the mineralization of epithermal gold deposits is mainly controlled by some small scale complexes, volcanic strata, volcanic apparatus and compound fractures ,and altered mylonite type gold deposit is broadly controlled by ductile shear zone and its concrete mineralization is mainly controlled by mylonitization.