By Sam Boggs Jr, David Krinsley
Minerals in sedimentary rocks emit attribute noticeable luminescence known as cathodoluminescence (CL) while bombarded by way of excessive power electrons. CL emissions should be displayed as color photographs in a cathodoluminescence microscope or as high-resolution monochromatic photographs in a scanning electron microscope. this gives info now not on hand through different concepts at the provenance of the mineral grains in sedimentary rocks, and insights into diagenetic alterations. The publication, first released in 2006, starts off with an simply understood presentation of the elemental ideas of CL imaging. this can be by way of an outline and dialogue of the tools utilized in CL imaging, and a close account of its functions to the examine of sedimentary rocks. the amount is a complete, simply understood description of the functions of cathodoluminescence imaging to the research of sedimentary rocks. it is going to be an enormous source for educational researchers, execs and complex graduate scholars in sedimentary geology.
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Additional info for Application of Cathodoluminescence Imaging to the Study of Sedimentary Rocks
The Technosyn stage was originally produced by 21 Cathodoluminescence imaging Technosyn Electron gun Objective lens Top plate Window To vacuum pump Sample Vacuum chamber Window Sample holder X–Y stage movement Stage centering attachment Condenser Nuclide Luminoscope Objective lens To vacuum pump Window M X–Y stage movement Electron gun Sample holder Sample Vacuum chamber Window Condenser Fig. 1. Schematic cross-section views of the Technosyn and Luminoscope cathodoluminescence stages. (After Barker and Wood, 1986.
Energy-dispersive X-ray spectroscopy (EDS) When an electron beam such as that from an SEM interacts with a sample, electrons are ‘‘promoted’’ from a lower-energy shell to a higherenergy shell (a process referred to as excitation), leaving a so-called ‘‘hole’’ in the lower-energy shell. When an electron then drops from a higher-energy shell back to a lower-energy shell to ﬁll this hole, X-rays are emitted. Inasmuch as the energy of X-ray photons is related to the energy difference between electron shells, the X-ray photons are characteristic of the elements present in the specimen undergoing analysis.
Ground from soils or unconsolidated sediments by ﬁrst impregnating the sample with epoxy resin. For some purposes, rock chips, such as cuttings from well bores, and loose grains can be glued to a slide or plug and examined in the SEM without being ground to standard thin-section thickness. An alternative technique is to grind a ﬂat surface on the mounted grains, glue this ﬂat surface to another slide, then grind away the ﬁrst glass slide to produce a ‘‘thin section’’ of the grain mount. See Trewin (1988) for details of these preparation methods.
Application of Cathodoluminescence Imaging to the Study of Sedimentary Rocks by Sam Boggs Jr, David Krinsley