多宝山铜矿床成矿作用地球化学研究

A STUDY ON ORE-FORMING GEOCHEMISTRY OF DUOBAOSHAN COPPER DEPOSIT,HEILONGJIANG PROVINCE

多宝山矿床位于区域铜的高背景场中。矿床外围及矿带周围存在有铜的降低场，表明降低场提供部分成矿物质铜是可能的。矿床的硫主要来源于深部。成矿热液钾硅化期为岩浆水，石英绢云母化期为岩浆水与大气降水的混合。矿床元素组合为：Ｃｕ、Ｍｏ、Ａｕ、Ａｇ、Ｐｂ、Ｚｎ、Ａｓ、Ｓｂ、Ｂｉ、Ｗ，由矿带向外出现Ｃｕ、Ｍｏ、Ａｇ→Ｐｂ、Ｚｎ的水平分带，由上向下出现Ｓｂ→ＡＳ→Ｚｎ→Ｐｂ→Ａｇ→Ｃｕ→Ａｕ→Ｍｏ→Ｂｉ→Ｗ的轴向分带。最后讨论了矿质沉淀机制以及硫同位素、元素组合、含矿热液、Ｈ、Ｏ同位素、成矿物化条件等成矿作用的演化和动力学机制。

Duobaoshan copper deposit lies in the higher background field of copper. There exists reduced field of copper beyond this deposit and ore belts. Therefore, it is possible that a part of copper of the deposit comes from that reduced field. And the sulfur comes mainly from the deep magma chamber. Hydro-thermal solution of potassic-silication stage is magma water, and that of phyllic ateration stage is a mixture of magma water with a part of rainwater. Guide elements of the deposit are Cu, Mo,Au, Ag,Pb, Zn, As,Sb, Bi, W.The horizontal zoning, from ore belt to its outside, is Cu,Mo, Ag→Pb,Zn. And axialzoning, from top to bottom, is Sb→As→Zn→Pb→Ag→Cu→Au→Mo→Bi→W. Finally, the mechanism of ore-forming is discussed and the evolution of surfur isotope, combination of elements, ore-bearing solution, H-O isotope,physical-chemical condition and the mechanism of dynamics of ore-forming are delt with in this paper as wel.