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 larger element than is feasible with traditional optical microscopy. Backscattered Scanning Electron Microscopy presents a concise precis of the BSE procedure. This entire consultant makes use of plentiful photographs to demonstrate the kind of info BSE yields and the appliance of the strategy to the learn of sediments and sedimentary rocks. The authors evaluate using this petrographic approach on all of the significant sedimentary rock forms, together with sediment grains, sandstones, shales, carbonate rocks, rock varnish, and glauconite. additionally they describe photograph research options 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 examine in this very important geological instrument.
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Scale bar = 100 jum. 26. K. Scale bar = 20 /xm. 27. K. Remaining areas of aragonite (A) appear relatively dark. Scale bar = 100 /xm. f-'t 45 SEDIMENT GRAINS, WEATHERING, AND EARLY DIAGENETIC PHENOMENA complex textural and mineralogical compositional pattern in the rock. 28 shows a relatively young groundwater calcrete collected from a dry stream bed developed on granitoid gneiss in semiarid Kenya (Pye and Coleman, in press). The rock has a high detrital matrix to cement ratio, the detrital component consisting mainly of sand- and silt-size quartz and feldspar fragments, with subsidiary mica.
1990). Cementation and replacement by secondary carbonate minerals is also an important process in many arid and semiarid zone soils. Pedogenic calcareous horizons, cemented mainly by calcite, dolomite, or a mixture of the two, may become exposed by surface erosion, leading to the formation of duricrusts. 23. , determined by electron microprobe analysis. V \ . -IS? /** - j • ;:. 24. K. Scale bar = 100/^m. 25. K. Scale bar = 100 jum. 26. K. Scale bar = 20 /xm. 27. K. Remaining areas of aragonite (A) appear relatively dark.
32). 28. Calcite cement (C) in the matrix of a late Holocene groundwater calcrete, from central Kenya. Scale bar = 50 jitm. 29. Dolomite (D) and calcite (C) in a Quaternary dolocalcrete, from central Kenya. Note the greater abundance of siliciclastic inclusions in the calcitef i I led fissure. 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.