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Fluid and melt inclusions and their fluid species in corundum megacrysts from the basalts in Changle, Shandong Province, eastern China
Author(s): 
Pages: 377-387
Year: Issue:  4
Journal: GEOCHIMICA

Keyword:  刚玉巨晶流体包裹体熔融包裹体流体组分不混溶作用山东省;
Abstract: 山东昌乐第三纪玄武岩中产有刚玉巨晶,内含丰富的原生和假次生流体包裹体和熔融包裹体.流体包裹体可分为CO2单相包裹体、H2O-CO2两相和三相包裹体.熔融包裹体类型复杂,其中富流体相包裹体可分为含 CO2收缩气泡两相熔融包裹体和气液固多相熔融包裹体.诸类包裹体主要赋含在刚玉晶核外的"主体"部分,以CO2单相流体包裹体和两相熔融包裹体最为发育,并且不同类型包裹体常密切伴生,表明它们形成时流体发生了不混溶作用:出现熔浆相(富含挥发分)、气相(CO2为主)和富水相(H2O-CO2为主)等多相体系.激光拉曼分析结果显示,各类包裹体中的气体组分主要是CO2,另有不等量的N2和H2S,据此划分为纯CO2、CO2-N2、CO2-H2S和CO2-N2-H2S等气体组合类型,没有发现O2、CH4和H2等组分.此外,拉曼分析也证实了流体包裹体和熔融包裹体中存在H2O.上述资料表明,昌乐地区深部流体以CO2为主,同时包含H2O、N2和H2S在内的多种组分,这些流体组分也是刚玉母浆系统的重要成分.
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