中文摘要：

通过详细的测温并辅以新发展的激光拉曼分析流体包裹体密度技术，对山东昌乐玄武岩内刚玉巨晶中的流体和熔融包裹体进行了测试，鉴定出：刚玉中多类流体包裹体为富CO2包裹体，也含少量其他挥发分，密度低于0．55g／cm^3（多数〈0．3g／cm^3）或位于0．65～0．75g／cm^3范围，前者指示包裹体遭受泄漏；另外一类流体包裹体为富CO2盐水包裹体，也含少量其他挥发分，密度0．64--0．78g／cm^3。各类熔融包裹体中，一类在1100-1300℃均一，另3类在1040～1280℃均一，但熔融包裹体中也有许多无法均一，是由于其内固体物质粘滞性高同时升温时间有限或富c02相、富熔体相不均一捕获所致。以熔融包裹体最低均一温度（1000-1100℃）代表刚玉内包裹体的捕获温度，用“等容线法”限定包裹体捕获压力为350-640MPa，经静岩压力换算深度为12～23km，即中一下地壳深度。大量富CO2包裹体在测温过程中无法观察到相变行为，是鉴定昌乐刚玉的重要标志，而富CO2及含CO2盐水包裹体与熔融包裹体密切伴生及熔融包裹体不均一捕获的特点，反映捕获温压条件下深部流体和熔体存在不混溶现象，也表明昌乐刚玉形成于中一下地壳CO2过饱和的高温熔体环境。

英文摘要：

The corundum megacrysts in basalts from Changle of Shandong Province, as the main source of blue sapphires in China, contain varied types of fluid and melt inclusions. Knowledge of their micro-thermometry, compositions, densities, and trapping temperatures （T） and pressures （P） is insufficiently known, which has hindered the study of source areas of sapphires, phase behaviors of fluids/melts in the Earth＇ s interior, and genesis of corundum megacrysts. The authors performed detailed mireo-thermometric measurement of the inclusions and used a newly-developed technique to analyze the densities of some fluid inclusions that were hardly obtained from micro-thermometry. Fluid inclusions are CO2-rich with minor other volatiles and have lower densities of 0 -0.55 g/cm^3（mostly lower than 0.3 g/cm^3）or otherwise higher densities of 0.65- 0.75 g/cm^3. The fluid inclusions with lower densities resulted from leakage. The other type of fluid inclusions is rich in H2O-CO2 with minor other volatiles and has low salinities with bulk densities of 0.64 - 0.78 g/cm^3. Except for a few which can be homogenized at 1 100--1 300℃, the two types of melt inclusions mostly cannot realize whole homogenization, which is attributed to the high viscidity of solid materials within the inclusions. For the other three types of melt inclusions, except for some which can be homogenized at 1 040-- 1 280℃, the others cannot be homogenized due to heterogeneous trapping of immiscible fluids and melts. Consequently, the lowest homogeneous temperatures of 1 000-1 100℃ are considered to be the real trapping temperatures. On the basis of the temperatures and by using isochores of fluid inclusions, the trapping pressures are constrained at 350--640 MPa, corresponding to 12--23 km litho-static pressures of the lower/middle crust. The phase changes in many CO2-rich inclusions cannot be observed during heating and cooling, which seems to be an important symbol for distinguishing Changle corundum from corundums of other areas. In addition