东天山土屋特大型斑岩铜矿成矿地质特征与矿床对比
The mineralization geological characteristics and the deposit comparison of Tuwu largest type porphyry copper deposit in eastern Tianshan Mountain
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摘要: 土屋特大型斑岩铜矿位于东天山吐鲁番—哈密陆块南部边缘岛弧环境中。多期岩浆活动和矿化是铜金属超常堆集的主要因素。海底火山活动和热泉沸腾逸散造就了铜金属的预富集(矿源层),闪长玢岩和斜长花岗斑岩的侵位和叠加矿化使铜金属进一步富化和最终成矿。以细碧角斑质为主的火山岩喷发于潮坪—滨海环境,闪长玢岩、斜长花岗斑岩形成于较强的氧化环境;强还原示踪矿物黄铁矿含量较少。矿石的低品位、矿石的结构构造、蚀变特征以及矿石建造具典型斑岩矿床特征;矿石高品位、矿床形成较低温度及大量硅化蚀变又表现为某些热液矿床特征(次火山岩热液)。典型斑岩铜矿床、次火山热液矿床、土屋铜矿床对比,土屋铜矿床矿床类型仍不失为斑岩型铜矿,并具有自身特征。Abstract: Tuwu largest type porphyry copper deposit is located in the island arc environment in the south margin of Turpan-Hami continental segment of eastern Tianshan Mountain. Many stages of magmatism and mineralization are the main reason of the copper metal unusual accumulation, the volcanic activity and hot spring which boils and spreads in the sea bottom make the copper metal preceding concentration (source bed), and the enplacement and superimposition mineralization of dioriteporphyrite and plagiclases-granitic porphyry in the some space makes the copper metal accumulate further and forms the deposit finally. The volcanic rock which is composed of spilite kera tophyre mainly erupted in tidal flat-littoral environment. The diorite-porphyrite and plagicla ses-granitic porphyry are formed in the shallow place of the earth crust. The mineralization occurs in the strong oxidation environment,so the pyrite which is the indicator mineral of the high reduction environment is little.
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