南京大学学报(自然科学版) ›› 2018, Vol. 54 ›› Issue (2): 236.
梁华英1*,张 健1,2,黄文婷1,陈喜连1,2,任 龙1,2,李凯旋1,2,王秀璋1
Liang Huaying1*,Zhang Jiang1,2,Huang Wenting1,Chen Xilian1,2, Ren Long1,2,Li Kaixuan1,2,Wang Xiuzhang1
摘要: 斑岩型铜(±金-钼)矿床和高氧化岩浆具紧密成因联系,我国及世界主要斑岩铜钼金矿床岩浆期多发育磁铁矿-赤铁矿组合,个别矿床见岩浆期石膏. 这表明斑岩铜(±金-钼)矿床成矿岩浆logf(O2)>ΔFQM+2,岩浆中的硫主要为氧化硫,斑岩型矿床的硫主要为还原硫. 斑岩矿床在岩浆演化晚期及钾化阶段多发育磁铁矿,而岩浆-成矿系统中亚铁(Fe2+)和氧化硫反应,可被氧化成为Fe3+,形成磁铁矿,氧化硫被还原. 因此提出斑岩矿床成矿早期磁铁矿化,使氧化硫被还原形成还原硫,为斑岩矿床硫化物沉淀析出提供充足还原硫,在斑岩矿床形成过程中起着关键作用. 据成矿岩体多发育磁铁矿,提出斑岩型矿床找矿中应注意高磁化率中酸性岩带;斑岩矿床主要成矿多发育于黄铁绢英岩化阶段,而在弱酸性环境下的黄铁绢英岩化过程中,磁铁矿会被黄铁矿交代,磁铁矿减少,矿化较强处磁化率会降低. 因此,高磁化率带岩体中低磁化率区或高低磁化率变化频繁地段应为寻找富矿的重点地段.
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