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By David Henry Krinsley

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 approach. This finished advisor makes use of considerable photos to demonstrate the kind of details BSE yields and the appliance of the strategy to the research of sediments and sedimentary rocks. The authors evaluate using this petrographic approach 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 publication will supply researchers and graduate scholars with the most up-tp-date examine in this vital geological instrument.

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Extra resources for Backscattered scanning electron microscopy and image analysis of sediments and sedimentary rocks

Example text

Modern solid-state detectors have signal to noise characteristics comparable with scintillator-photomultiplier detectors and have the advantage of being compact and relatively inexpensive. However, they are somewhat fragile and subject to breakage unless care is taken to ensure adequate clearance between a sample and the detector. Low-Voltage Backscattered Electron Detectors A number of detectors have been developed specifically to assist image acquisition from sensitive and uncoated samples (mainly biological specimens and nonconducting materials) at low-kV and small probe currents.

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. In the more poorly sorted muddy marsh facies, siderite, Mg-calcite, and iron monosulfide crystals are typically much smaller than in the sandy facies and occur as a partially displacive cement. The morphology of the cement crystals is dependent upon a number of factors, including the available space for crustal growth and the chemistry of the ambient pore fluids.

35. Laminated subglacial calcite precipitate from Tsanfleuron, Switzerland. Scale bar = 300 /Am. which is much thicker and shows well-developed smallscale lamination, consists of more than 85% calcite, whereas the thin and more discontinuous upper layer contains less than 50% calcite, the remainder comprising detrital siliciclastic grains. 36 shows a contrasting goethite/jarosite subglacial precipitate from Mitdalsbreen, Norway. In this instance the goethite and jarosite have penetrated fissures in the bedrock underlying the surficial precipitate.

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