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熔融包裹体中的硅酸盐子矿物、金属相和流体相可以动态地反映岩浆演化过程中岩浆的成分变化和金属成矿物质从熔浆中出熔分离的过程。本文选取南大西洋中脊15°S(SMAR15°S)热液区玄武岩斜长石熔融包裹体作为研究对象,通过扫描电镜能谱分析和激光拉曼分析,揭示熔融包裹体中熔体相的成分和金属矿物的种类,探讨岩浆作用对成矿的贡献。研究表明,斜长石熔融包裹体中存在黄铜矿、黄铁矿、磁铁矿和铬铁矿等金属子矿物,它们随脱气作用从岩浆中分离并进入岩浆流体相中冷凝结晶。熔融包裹体中金属子矿物与母岩无明显蚀变,共同指示岩浆流体对SMAR15°S热液区块状硫化物的形成可能具有一定贡献。SMAR15°S热液区热液硫化物可能存在岩浆来源。
Silicate mineral, metal phase and fluid phase in melt inclusions can dynamically reflect the composition change of magma and the separation of metal mineralization from the melt during magmatic evolution. In this paper, basaltic plagioclase inclusions in the 15 ° S (SMAR15 ° S) hydrothermal area of the Southern Atlantic Ridge are selected as the research object. The composition of the melt phase in the melt inclusions is revealed by scanning electron microscopy and laser Raman analysis And the types of metal minerals, and discuss the contribution of magma to metallogenesis. The results show that there are chalcopyrite, pyrite, magnetite and chromite mineral inclusions in the plagioclase melt inclusions, which are separated from the magma by degassing and enter the magma fluid phase to condense and crystallize. There is no obvious alteration of metallogenic minerals and parent rocks in the melt inclusions, indicating that the magmatic fluids may contribute to the formation of massive sulfides in the SMAR15 ° S hydrothermal zone. SMAR15 ° S Hydrothermal Area Hydrocarbons may be of magmatic origin.