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Micro-thermometry and Raman density analysis of fluid and melt inclusions in corundum megacrysts from basalts in Changle, Shandong Province
Author(s): 
Pages: 489-504
Year: Issue:  6
Journal: Acta Petrologica et Mineralogica

Keyword:  流体包裹体熔融包裹体测温拉曼密度分析刚玉巨晶山东昌乐;
Abstract: 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/cm3(多数<0.3 g/cm3)或位于0.65~0.75 g/cm3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0.64~0.78 g/cm3.各类熔融包裹体中,一类在1 100~1 300℃均一,另3类在1 040~1 280℃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CO2相、富熔体相不均一捕获所致.以熔融包裹体最低均一温度(1 000~1 100℃)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350~640 MPa,经静岩压力换算深度为12~23 km,即中-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.
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