新疆哈密翠南金矿成矿分析

Metallogenic analysis of cuinan gold deposit,Hami,Xinjiang

翠南金矿位于秋格明塔什-黄山韧性剪切带之南翼,构造复杂多样,变形变质独特。金矿床的赋矿地层为下石炭统干墩组含黄铁矿化石英脉的碎屑岩中,碎屑岩系产生强烈变形和碎裂,与此同时华力西中、晚期的中酸性重熔岩浆岩广泛侵位,带来大量热源和热液,促使矿源层产生去硅、去铁变化,分散的Au随着热液活动而活化、迁移。多期热液活动,一方面使围岩产生多种蚀变,另一方面Au质不断运移、富集,当进入韧性剪切带内破碎的糜棱岩等有利构造部位运移富积成矿。

Cuinan gold deposit is located in the south wing of qiugmingtash Huangshan ductile shear zone,with complex structures and unique deformation and metamorphism.The ore bearing strata of the gold deposit are the clastic rocks of pyritized quartz vein of gandun formation of Lower Carboniferous.The clastic rocks have strong deformation and fragmentation.At the same time,the intermediate acid heavy lava of middle and late Variscan is widely emplaced,which brings a lot of heat source and hydrothermal fluid,and promotes the production,desilication and iron removal of the source bed.The dispersed Au is activated and migrated with the hydrothermal activity.The multi-stage hydrothermal activity,on the one hand,makes the surrounding rock produce many kinds of alteration,on the other hand,the Au is continuously migrating and enriching,when it enters the favorable structural parts such as the broken mylonite in the ductile shear zone,it is migrated and enriched for mineralization.