摘要
公婆泉铜矿位于塔里木－中朝板块中段过波类型区岛弧环境中。矿床产于钙碱系列中酸性浅成－超浅成相斑岩体内．矿床受斑岩体、古火山机构和区域北西西向主干断裂控制．据容矿岩石、矿石矿物、微量元素、硫、铝、氧、氢、碳同位素、包体地球化学、稀土元素分析研究，认为矿床具矿化蚀变多阶段、矿质多来源的成矿特点．属中高温气成热液－海相火山斑岩型矿床．
The deposit seated at the Gongpoquan-Yaodongnuru island arc subzone of the oceanic fringe volcanic belt is located on the Pochengshan-Yingzuihongshan island arc of the nor them fringe transitional area in the middle section of Tarim-Sino-Koorean plate.The deposit is spatially controlled by the island arc zone and the NWW regional major fault.The deposit occurs in subdacitic porphyry, quartz dioritic porphyrite and granodiritic porphyry body as well as in their nearby wall rock.The ore-bearing porphyry is an ultra-hypabyssal to hypabyssal rock,derived from the island arc environment,which belongs to calcalkaline series intermediate to acid granitic rock.Isotope composition of S and Ph shows that ore-forming substance derives from the deep-seated magma,and is superimposed by remelting substance of the crust.And isotope composition of H,O and C shows that in the early and middle period of ore-forming there exists mainly magmatic water and in the late period of ore-forming,the meteoric water is on much increase.Alteration of the deposit is very intense,with the K metasomatism and H metasomatism alteration assemblage as well as alteration zoning being characterized by porphyry copper deposit.The research reveals the oreforming temperature to be about 400℃,and the deposit belongs to one of the middle to high temperature pneumatolyto-hydrothermal-marine volcanic porphyry type.
出处
《西北地质科学》
1995年第1期115-122,共8页
Northwest Geoscience
