地幔流体及其金成矿作用——兼论夹皮沟金矿田的地幔流体与成矿

MANTLE FLUID AND ITS ROLE IN GOLD ORE-FORMING PROCESS_TAKING JIAPIGOU GOLD FIELD FOR EXAMPLE

摘要: 地幔流体是以C-H-O为主的体系，富含H、CO₂、CH₄、H₂S、H₂O和大量的不相容元素（如K、P、Li等）及一定量的金属氧化物，在不同地质环境下其组成成分有一定的变化.地幔流体有地幔柱型、洋中脊玄武岩型和岛弧型3种主要源区，通过交代和（或）溶解地幔、地壳岩石等方式迁移、富集而成矿.夹皮沟金矿田内构造-岩浆活动及区域变质作用表明该区地幔活动频繁且强烈，金矿成矿流体具有地幔流体组成和成矿作用特征，显示金矿成矿作用与地幔流体活动密切相关

Abstract: Mantle fluid is a system majorly composed of C-H-O,and riched in H,CO₂,CH₄,H₂S,H₂O and incompatible elements(K,P,Li,etc.)with some metallic oxides.The composition of the mantle fluid varies with depth,lithology and physical-chemical conditions.The mantle fluids are mainly derived from mantle plumes,MORB and arc areas.According to some research results of mantle fluid,the probable metallogenic modes and mechanisms of mantle fluid are summed,and the genetic relationship between the mantle fluid and the large gold deposit field is explained by some examples.