By David Henry Krinsley
Backscattered scanning electron microscopy (BSE) unearths 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 presents a concise precis of the BSE procedure. This finished consultant makes use of considerable photographs to demonstrate the kind of details BSE yields and the applying of the strategy to the learn of sediments and sedimentary rocks. The authors evaluate using this petrographic process on all of the significant sedimentary rock kinds, together with sediment grains, sandstones, shales, carbonate rocks, rock varnish, and glauconite. additionally they describe snapshot research concepts that let quantification of backscattered scanning electron microscope photos. seriously illustrated and lucidly written, this e-book will supply researchers and graduate scholars with the most up-tp-date examine 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
1979). The osmium tetroxide is taken up preferentially by the organic matter in the specimen and is subsequently easily identified by its relatively high atomic number contrast. SAMPLE COATING AND MOUNTING The finished polished sections or chips are coated with 100-150 A of carbon in a vacuum sputter coater prior to SEM examination. For most samples carbon is preferred for coating because gold gives rise to a high degree of scattering from the surface film, which tends to suppress the atomic number contrast from the underlying specimen.
By adjustment of the contrast mechanism, zircon and ilmenite can be differentiated and counted separately. , Ball and McCartney, 1981; Pye, 1984a). If a wide range of mineral types is present in a sample, including some with similar BSE coefficients and overlapping gray levels, it may be necessary also to employ automated X-ray microanalysis to differentiate and quantify the different mineral phases. The second main way in which BSE images are useful in the study of individual grains relates to the quantification of grain size and form.
Scale bar = 10 ^tm. 30. Partially dissolved amphibole grain in Quaternary dolocrete, from central Kenya. Scale bar = 30 jitm. 31. Manganese oxide vein ing (white) in Quaternary dolocrete, from central Kenya. Scale bar = 30 /xm. 47 SEDIMENT GRAINS, WEATHERING, AND EARLY DIAGENETIC PHENOMENA solution following stripping of the overlying sediments. The dolomite in these zones is cross-cut by veins in which the main cement is low-Mg, nonferroan calcite, surrounding fairly numerous siliciclastic inclusions.
Backscattered scanning electron microscopy and image analysis of sediments and sedimentary rocks by David Henry Krinsley