Fluid Inclusion 40Ar/39Ar Dating Technique and Its Applications
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摘要: 同位素地质年代学的各种定年方法都有其特定的测定对象（矿物或全岩）和适用范围，致使许多金属矿床难以进行年龄测定.为解决此难题，建立了流体包裹体40Ar/39Ar定年方法，经过30年的探索发展和不断改进完善，已广泛应用于热液矿床、变质岩和石英脉的形成年龄测定，甚至成功应用于松辽盆地深层天然气成藏年龄研究.在详细介绍流体包裹体提取技术和气体纯化技术的基础上，着重总结我们团队运用流体包裹体40Ar/39Ar定年技术在热液矿床和天然气藏形成年龄研究方面取得的重要成果，以及气体混合线的概念及其年龄意义.
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关键词:
- 40Ar/39Ar定年 /
- 流体包裹体 /
- 成矿年龄 /
- 油气成藏年龄
Abstract: Various isotope geochronometers have their specific dating objects (minerals or whole rocks) and age ranges.It is difficult to date the ages of hydrothermal deposits.To solve this problem, the 40Ar/39Ar progressive crushing technique to date the ages of fluid inclusions is established.This technique has been improved and developed for thirty years, widely applied to determine the forming ages of hydrothermal deposits, metamorphic rocks and quartz veins, as well as the natural gas fields in deep Songliao Basin.In this article, the experimental techniques of fluid inclusion extraction and gas purification are introduced in detail, followed by the important applications in hydrothermal deposits and gas/oil fields as illustrations of 40Ar/39Ar dating by the stepwise crushing technique.The gas-mixing patterns yielded by crushing are also discussed.-
Key words:
- 40Ar/39Ar dating /
- fluid inclusion /
- mineralization age /
- petroleum accumulation age
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图 2 有机杂气纯化系统示意图
据He et al.(2015)和邱华宁(2015)
Fig. 2. Schematic diagram of organic gas purification system
图 3 闪锌矿流体包裹体、40Ar/39Ar年龄谱与等时线(1σ)
Fig. 3. Fluid inclusions, 40Ar/39Ar age spectra and inverse isochrons of two sphalerite samples by progressive crushing
图 4 漂塘钨矿09PT01白云母(Ms)和锡石(Cst)40Ar/39Ar年龄谱、等时线和K-Cl-Ar相关图解
Fig. 4. 40Ar/39Ar age spectra, inverse isochrons and K-Cl-Ar correlations for a muscovite and a cassiterite
图 5 松辽盆地深层营城组火山岩石英中含烃盐水包裹体及其激光拉曼分析
据吴河勇等(2010).图a显示含烃盐水包裹体沿微裂隙分布的次生包裹体；图b中激光拉曼分析呈现非常明显的甲烷峰，表明这些次生包裹体是天然气藏形成过程中捕获的
Fig. 5. Secondary fluid inclusions and Raman spectrum of volcanic quartz, Songliao Basin
图 6 松辽盆地深层CO2气藏石英流体包裹体40Ar/39Ar年龄谱和等时线(1σ)
Fig. 6. Age spectrum and inverse isochron of quartz DQ55Q from CO2 reservoir, Songliao Basin
图 7 半坑古油藏断裂带内沥青伴生石英阶段击碎分析40Ar/39Ar年龄谱与等时线(1σ)
据Liu et al.(2011).以对应的等时线初始值分段扣除非放射性成因40Ar计算表观年龄
Fig. 7. Age spectrum and inverse isochron of a quartz from the Bankeng paleo-reservoir, middle Yangtze Block
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