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 element than is feasible with traditional optical microscopy. Backscattered Scanning Electron Microscopy presents a concise precis of the BSE strategy. This complete advisor makes use of plentiful photographs to demonstrate the kind of info BSE yields and the appliance of the strategy to the research of sediments and sedimentary rocks. The authors assessment using this petrographic method on all of the significant sedimentary rock varieties, together with sediment grains, sandstones, shales, carbonate rocks, rock varnish, and glauconite. additionally they describe photograph research innovations that let quantification of backscattered scanning electron microscope pictures. seriously illustrated and lucidly written, this ebook will offer researchers and graduate scholars with the most up-tp-date learn in this vital geological device.
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Additional resources for Backscattered Scanning Electron Microscopy and Image Analysis of Sediments and Sedimentary Rocks
Scale bar = 20 42 energy-dispersive analysis has determined that the Warham siderite contains little substituted Mg (< 3%), although Ca substitution may be up to 10 mol % (Fig. 23). Many of the concretions contain well-preserved root material in which the cells are both infilled and partially replaced by authigenic siderite and iron monosulfide (Allison and Pye, 1994; EARLY DIAGENETIC PHENOMENA Figs. 25). Many shells within the concretions are partially or wholly replaced by siderite (Figs. 27), detrital aragonite being more susceptible to replacement than detrital calcite.
Detail of internal compositional zonation within a manganese nodule from the Pacific Ocean. Scale bar = 100 jum. 16. K. (Q = quartz; P = porosity; S = siderite); (b) windowed BSE image showing distribution of siderite cement (white); (c) windowed and inverted BSE contrast image showing distribution of porosity (white). Scale bars = 100 JJLVT\. 1 7. K. Scale bar = 200 /xm. 18. 17, showing coating of iron monosulfide (FeS, arrowed) on Mg-calcite crystals. Scale bar = 100/im. 40 siderite cement and unfilled porosity.
36. Geothite-jarosite subglacial precipitate (white) from Mitdalsbreen, Norway. Goethite and jarosite penetrate along fissures in the underlying bedrock. Scale bar = 100 /xm. 37. Goethite-jarosite (G-J) subglacial precipitate (white) developed on schist bedrock, from Mitdalsbreen, Norway. Many of the grains included within the precipitate are silt- to sand-size quartz and feldspars, suggesting that a significant proportion of the grains has been derived from an allochthonous source. 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 Scanning Electron Microscopy and Image Analysis of Sediments and Sedimentary Rocks by David H. Krinsley, Kenneth Pye, Sam Boggs Jr, N. Keith Tovey