An EPMA Ultraviolet Cathodoluminescence Micro-Area Measuring System and Its Application to Petrogenetic Analysis for Clasolites
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摘要: 在JCXA 733电子探针上采用一种实用的微区紫外-可见阴极荧光的探测方案, 可以分析样品表面微区的不可见和可见的荧光.荧光的波长和强度特性与物质的成分、结构、缺陷, 物质的形成条件、经历、所处环境条件等密切相关.相对于常规的可见阴极荧光测试技术, 探测紫外和红外阴极荧光可以在更宽的波段上获取更多更新的样品内在信息.用此方法对河北唐山石英砂岩及其微小次生加大边进行阴极荧光分析, 发现它们具有不同的紫外荧光特征, 还有对应波长为2 87nm的辐射损伤色心, 由此可以推测至少有两期胶结作用, 且石英碎屑来源复杂.这为分析胶结作用期次和碎屑物物源提供了新的技术方法, 对于沉积盆地分析和油气储集具有重要的实用意义.Abstract: A practical detection scheme with JCXA-733 EPMA-based micro-ultraviolet visible cathodoluminescence has been constructed to analyze both invisible and visible luminescence phenomena for the micro-area surface of solid samples. The wavelength and intensity of the luminescence depend largely on composition, crystal structure and crystal defection of the materials, and also on the growth conditions, growth processes and the environmental conditions where occur the materials. Ultraviolet and ultra-infrared detection of samples will yield more inherent information over broad waveband. Application of this method to the analysis of the source for quartz detritus and of the generation relation between micro rims of secondary enlargement quartz in glauconite-bearing quartz sandstone from Tangshan region, Hebei Province, reveals both the distinct features of ultraviolet luminescence and the radiate-damnification-induced color center at 287 nm wavelength. Hence, it can be deduced that this sandstone experienced two generations of cementation and that its quartz detritus were derived from complex sources. This technique provides a new tool for the investigation into the detritus sources and cementation histories for clasonites and shows a great significance for the analysis of sedimentary basins, oil and gas reservoir.
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Key words:
- cathodoluminescence (CL) /
- micro-area analysis /
- ultraviolet (UV) /
- spectrum
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图 2 碎屑石英及次生加大边
Qd.碎屑石英; Qo.石英次生加大边; 数字编号是分析位置号, 对应CL图谱上的编号
Fig. 2. Drawing showing textural relationship between detrital quartz and cement quartz for analysis
图 3 石英加大边(a) 和碎屑石英(b) CL光谱
图中波长刻度不是整数是因为进行了波长校正
Fig. 3. CL spectra for cement quartz (a) and detrital quartz (b)
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