新疆额尔齐斯金矿带典型金矿床特征及成矿预测

Geological Characteristics and Metallogenic Prediction of Typic Gold Deposit in Ertix,Xinjiang

额尔齐斯金矿带位于新疆阿尔泰南缘,是东准噶尔大型金矿化集中区。区域出露地层主要有泥盆系与石炭系陆源碎屑岩类,构成成矿的母岩层;区内岩浆活动频繁,以华力西中晚期酸性—中酸性侵入岩为主,火山岩主要呈带状展布的玄武岩—安山岩—英安岩类;构造极为发育,以NW、NWW向深断裂为主,构造带发育强烈片理化、劈理化和糜棱岩化等强塑性变形,具韧—脆性剪切变形特征,各序次构造及其交会部位控制了矿床的导矿、容矿空间,造成区内金矿床点严格就位于NW-NWW向断裂及其次级扩容空间,且其矿石呈现破碎蚀变、糜棱岩化等动力变形特征;区内成矿历经泥盆纪—早石炭世预富集期和晚石炭世—二叠纪构造变形主成矿期,矿体主要赋存于韧—脆性、脆性剪裂空间内;区域金成矿远景选区以构造控矿特征为主,并对金矿点密集分布、异常集中区进行优先筛选。

The Ertix gold belt lies in the southern margin of the Ahay area in Xinjiang.h is a larger gold mineralization area in the eastern Junggar.The stratum are mainly clastic rock of the Devonian and Carboniferous,which become the parent stratum in the area.There are frequent magmatic activities in the region, which are based mainly on the acid and neutral acid incursion rocks in the middle and later Variscan.Distribution of volcanic rocks are mainly for linearly basalt, andesite and dacite class in zone.The structure is mainly the deep fault in NW-NWW, which has strong ductile deformation of schistosity,cleavage and mylonitization,and has the character of ductile-brittle shear deformation.All sorts of sequence structure and its crossing area controlled the ore-guided and ore-containing space, and resuhed gold deposits stringent located in the fault of NW-NWW and secondary dilatancy space, and the ore is showed the feature of broken alternation and mylonitization that have been dynamic deformation.The ore-forming period include the preconcentration in Devonian to early Carboniferous and in later Carboniferous to Permian.It main occurrence in ductile-brittle and brittle shear crack in space.Gold metallogenic region was dominated by structural ore-controlling characteristics of the selection. It is preferentially filtered goht points which are densely distributed and abnormal concentration area .