By David H. Krinsley, Kenneth Pye, Sam Boggs Jr, N. Keith Tovey
Backscattered scanning electron microscopy (BSE) finds the minerals, textures, and materials of sediments and rocks in a lot higher aspect than is feasible with traditional optical microscopy. Backscattered Scanning Electron Microscopy offers a concise precis of the BSE strategy. This complete consultant makes use of plentiful photos to demonstrate the kind of details BSE yields and the applying of the strategy to the research of sediments and sedimentary rocks. The authors overview using this petrographic method on the entire significant sedimentary rock kinds, together with sediment grains, sandstones, shales, carbonate rocks, rock varnish, and glauconite. in addition they describe snapshot research recommendations that let quantification of backscattered scanning electron microscope pictures. seriously illustrated and lucidly written, this booklet will supply researchers and graduate scholars with the most up-tp-date learn in this vital geological instrument.
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Extra info for Backscattered Scanning Electron Microscopy and Image Analysis of Sediments and Sedimentary Rocks
Example text
Replacement, albitization, dissolution, and precipitation). 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).
Formation of the gypsum crystals took place mainly displacively, close to the water table within eolian sand host sediments. Host grains that became trapped within the growing nodular layer subsequently experienced partial dissolution. Authigenic precipitates, containing various amounts of included detrital material, have been widely reported from subglacial settings. 32. Pelloid of authigenic palygorskite (P) in Quaternary dolocalcrete, from central Kenya. The matrix consists mainly of a mixture of calcite (C) and dolomite (D).
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). , Dilks and Graham, 1985). As discussed in Chapter 2, the intensity or gray level of a given mineral phase in a BSE image is determined by the backscatter coefficient, 17, which is a function of the atomic number of the elements that make up the mineral. 2; the higher the backscatter coefficient, the brighter the mineral appears in BSE.