Use cathodoluminescence (CL) imaging for micro-characterization of sedimentary rocks. Reveal the textures and contrasts of interest at the microscale.
Sedimentary rocks present a valuable source of iron and natural fertilizer. Furthermore, they form the main source of fossil fuels (oil, natural gas, and coal) and thus hold great practical value. The microscale/nanoscale porosity and structure can be used to interpret the geological history of the rock. These also directly affect the overall chemical, mechanical, and fluid transport properties of the rock and hence studying the rocks at those length scales is of interest.
SEM-based cathodoluminescence spectroscopy can be used to quantitatively map the quartz composition of sandstones which enables, for instance, the rigorous segmentation of granular material and cemented material. Similar approaches are available for carbonate and apatite based rocks. As these different minerals have a unique CL response, the technique can also be applied to more inhomogeneous mixed samples.
Performing large-area measurements allows establishing general cathodoluminescence structure of rock and small-scale hyperspectral measurements allow to gain more detailed insight into specific regions. By combining CL imaging with other analytical SEM-based techniques such as BSE, EBSD, WDS, and EDS fully comprehensive automated sedimentary rock studies can be performed.
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