Read e-book online Atlas of Metamorphic Rocks and Their Textures PDF

By Bruce W. Yardley, W. S. MacKenzie, C. Guilford

ISBN-10: 0470216778

ISBN-13: 9780470216774

ISBN-10: 0582301661

ISBN-13: 9780582301665

This ebook gathers the best ever choice of metamorphic rock photos. Divided into sections. part One contains photomicrographs of a large rangeof rock of alternative chemistries metamorphosed below a number of actual stipulations and in numerous metamorphic settings. part bargains with textures attribute of metamorphic rocks. In all it comprises over 250 color images, followed through brief descriptions and dialogue, making this the main visually beautiful of the entire significant other volumes.

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Extra info for Atlas of Metamorphic Rocks and Their Textures

Example text

End member particle shapes are compact, platy, and elongated. As in the case of Zingg’s shape fields, note that lines of equal (maximum projection) sphericity plotted on this diagram can cross several form fields. More recently, Illenberger (1991) presented a triangular shape diagramp(Fig. 11) in which a sphericity parameter called the Corey shape index, defined as S= IL; is plotted against a disc-rod index [(L − I)/(L − S)], where L, I, and S refer to the lengths of the long, intermediate, and short axes, respectively.

Also, the average grain-size and sorting of samples cannot be determined very accurately by visual inspection of grain-size graphs. To avoid these difficulties, mathematical methods that permit statistical treatment of grain-size data can be used to derive parameters that describe grain-size distributions mathematically. Average grain size Three mathematical measures can be used to describe the average size of grains in a sediment sample. The mode is the most frequently occurring particle size in a population of grains.

3 Grain shape 47 the best of the commonly used procedures for determining sphericity and roundness are limited by observational subjectivity and low discriminating power. For example, measurement of the three axes of a particle does not provide a unique characterization of particle form. Particles with quite different form may have the same numerical sphericity when measured in this manner. On the other hand, measurement of grain shape by Fourier analysis leads to more exact characterization of (two-dimensional) shape, and may thus hold greater potential for provenance and environmental interpretation.

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Atlas of Metamorphic Rocks and Their Textures by Bruce W. Yardley, W. S. MacKenzie, C. Guilford


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