北祁连桦树沟(铁)铜矿床地球化学特征及成因

GEOCHEMISTRY AND METALLOGENESIS OF THE HUASHUGOU COPPER

桦树沟（ 铁）铜矿床矿石及含矿岩系的稀土元素、微量元素、稳定同位素、流体包裹体以及同位素年代学等地球化学研究表明，铜矿床形成于近大陆边缘的海底裂谷环境，成矿物质主要来自元古代基性火山岩，硫、碳主要来自海水。火山—沉积岩系经深循环水—热系统的作用，成矿物质被浸出和搬运，并经海底喷溢作用沉淀于海盆洼地中形成含矿层，后期变质作用使成矿物质活化、转移和富集。矿床成因为喷气（流）沉积—变质改造型（

The studies on REE, trace elements, stable isotopes, fluid inclusions and geochronology indicate that the Huashugou copper (iron) deposit was formed in a submarine rift near continental margin. The ore-forming material came from the Proterozoic basic volcanic rocks, and S, C from sea water. The ore-forming material in the volcanic-sedimentary rocks was extracted and mobilized by deep circulating fluid, deposited on the submarine depression in the submarine exhalation process, and then enriched in the metamorphic process. It is originally a sedimentary-exhalation―metamorphic reformed copper (iron) deposit.