By David H. Krinsley, Kenneth Pye, Sam Boggs Jr, N. Keith Tovey
Backscattered scanning electron microscopy (BSE) unearths the minerals, textures, and materials of sediments and rocks in a lot better aspect than is feasible with traditional optical microscopy. Backscattered Scanning Electron Microscopy presents a concise precis of the BSE procedure. This finished consultant makes use of plentiful pictures to demonstrate the kind of details BSE yields and the appliance of the strategy to the examine of sediments and sedimentary rocks. The authors overview using this petrographic method on all of the significant sedimentary rock forms, together with sediment grains, sandstones, shales, carbonate rocks, rock varnish, and glauconite. in addition they describe snapshot research suggestions that let quantification of backscattered scanning electron microscope photos. seriously illustrated and lucidly written, this booklet will offer researchers and graduate scholars with the most up-tp-date examine in this very important geological software.
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Additional info for Backscattered Scanning Electron Microscopy and Image Analysis of Sediments and Sedimentary Rocks
The BSE signal received by each quadrant is affected slightly differently by the surface topography of the specimen. , 1966). This facility can be useful if it is necessary to separate true topography from pseudotopographic contrast generated by differential scattering effects at crystal boundaries. Early solid-state detectors did not produce good TV-rate images (Robinson and Nickel, 1983), but this problem has been largely overcome with later versions (Hall and Lloyd, 1983). Modern solid-state detectors have signal to noise characteristics comparable with scintillator-photomultiplier detectors and have the advantage of being compact and relatively inexpensive.
Scale bar = 100 51 Sandstones Although the petrographic microscope remains the basic tool for analysis of sandstones, petrographic microscopy is being increasingly supplemented by newer analytical methods. Backscattered electron microscopy (BSE) ranks as one of the more useful of these newer techniques because BSE, coupled with energy-dispersive X-ray analysis (EDX), provides a powerful tool for mineral identification, porosity determination, and study of fine-scale grain-to-grain and intragrain relationships (Chapter 3).
Initial identification of minerals is made by using EDX to determine the relative abundance of chemical elements in the mineral. Once a given mineral has been identified, its brightness or intensity is determined on the basis of a BSE image gray-level scale extending from 0-255. , 56-97 for kaolinite, 98-109 for quartz, 110-131 for K-feldspar). Once the segmentation thresholds for each mineral are set, the image analyzer can automatically determine the area of each mineral in a given image field and thus can calculate the relative abundance of that mineral in the image field 53 SANDSTONES (Dilks and Graham, 1985).
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