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 element than is feasible with traditional optical microscopy. Backscattered Scanning Electron Microscopy offers a concise precis of the BSE strategy. This entire consultant makes use of plentiful photographs to demonstrate the kind of details BSE yields and the appliance of the strategy to the learn of sediments and sedimentary rocks. The authors evaluate using this petrographic method on the entire significant sedimentary rock kinds, together with sediment grains, sandstones, shales, carbonate rocks, rock varnish, and glauconite. additionally they describe photo research innovations that permit 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 learn in this very important geological software.
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Extra resources for Backscattered Scanning Electron Microscopy and Image Analysis of Sediments and Sedimentary Rocks
52 IDENTIFICATION OF FRAMEWORK CONSTITUENTS QUANTITATIVE IDENTIFICATION OF FRAMEWORK CONSTITUENTS The fundamental techniques for identifying minerals by using BSE are discussed in Chapters 2 and 9. In these chapters, we describe quantitative techniques for identifying different mineral phases through a combination of X-ray mapping and BSE image analysis, which utilize differences in gray-scale brightness of different mineral phases as displayed in BSE (Tovey and Krinsley, 1991). The BSE method is particularly important in study of shales because of the difficulty of applying petrographic microscopic methods to identification of very fine minerals in shales (Chapter 5).
15). Diagenetic nodules and concretions are also common features in terrestrial soils and sediments. In some instances, the concretions are cemented by a passive cement that partially or wholly infills the primary (and some secondary) pore spaces. K. 16a. 13. Partially dissolved detrital volcanic feldspar in a matrix of fine-grained mud (partly authigenic), Lake Magadi, Kenya. Scale bar = 20 /x-m. 14. A manganese nodule from the Pacific Ocean, showing concentric growth banding. Scale bar = 1000/AID.
By applying a positive bias on the screen on the entrance side of the detector, incoming secondary electrons can be accelerated sufficiently to obtain a topographic image. SPECIMEN PREPARATION Water Removal, Embedding, and Impregnation The quality of the SEM images ultimately obtained is heavily dependent upon sample preparation. A flat, wellpolished surface is the single most important requirement to obtain high-quality atomic number contrast images. Some hard-rock samples can be cut and polished in a relatively straightforward manner; more sensitive or fragile samples require careful pretreatment and handling to ensure that plucking, smearing, selective dissolution, or excessive shrinkage does not occur.