Weathering rates in granitic boulders measured by P-wave speeds

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Authors:Crook, Richard, Jr.; Gillespie, Alan R.
Author Affiliations:Primary:
Private address, Sierra Madre, CA, United States
Williams Coll., Dep. Geol., United States
Jet Propul. Lab., United States
Volume Title:Rates of chemical weathering of rocks and minerals
Volume Authors:Colman, Steven M., editor; Dethier, David P.
Source:Rates of chemical weathering of rocks and minerals, edited by Steven M. Colman and David P. Dethier, p.395-417. Publisher: Acad. Press, Orlando, FL, United States. ISBN: 0-12-181490-4
Publication Date:1986
Note:In English. 45 refs.; illus. incl. 4 tables, sketch map
Summary:Data have been taken from P-wave speed measurements in granite clasts from coarse alluvial terrace deposits and glacial moraines in six areas of semi-arid California. The method of determining compressional wave speeds is described and a sampling strategy outlined. Observed decreases in P-wave speed in the early stages of weathering are largely due to the formation of micro-fractures, but other processes are also involved. P-wave speeds appear to decrease with the logarithm of the age of the clastic deposit and until rind formation occurs, is a good guide to age. [K.M.C.]
Subjects:Body waves; Elastic waves; Geophysical methods; Geophysical surveys; Granitic composition; P-waves; Rates; Sedimentary petrology; Seismic methods; Seismic waves; Surveys; Weathering; California; United States
Abstract Numbers:89M/2824
Record ID:1986086178
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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