摘要
通过对钴有关化合物的形成条件和理化性质,钴矿床矿物流体包裹体的化学成分、代表性钴矿物的化学成分、共、伴生矿物组合的探究,结合钴成矿地质背景和环境研究认为,钴的氢化物、合金氢化物、羰基化合物、羰基氢化物是内生钴的主要迁移形式。它们形成于地球深部高压、高温、富氢、富CO的强还原环境,通过断裂、裂隙随岩浆、热液迁移至地壳浅部,由于压力、温度骤降,氧逸度渐增、H2和CO逃逸、氧化,上述钴的化合物分解、氧化、硫化、砷化,沉淀富集形成内生钴矿床,并在以后地质事件中进一步叠加富集,形成更富更大的钴矿床。
The study of physical and chemical properties of cobalt chemical compounds, chemical compositions of fluid inclusions from cobalt deposits, chemical compositions of cobalt minerals and associated minerals indicates that cobalt was migrated as hydrides, hydroxides, Au-bearing hydrides, hydroxyl compounds and carbonyl-hydroxyl compounds. These compounds were formed in high temperature and high pressure conditions rich in H and CO, and ascended along fractures and fissures to upper crust and decomposed, oxidized, vulcanized and deposited thanks to decrease in pressure and temperature and increase in oxygen fugacity and escape of H2 and O, forming cobalt deposit.
出处
《四川地质学报》
2010年第3期364-368,共5页
Acta Geologica Sichuan
关键词
钴矿床
迁移形式
成矿机理
cobalt deposit
migration form
ore-forming mechanism
