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A field method for making a quantitative estimate of altered tuff in sandstone

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A field method for making a quantitative estimate of altered tuff in sandstone; 1954; TEI; 174; Cadigan, R.A.

Summary

The use of benzidine to identify altered tuff in sandstone is practical for field or field laboratory studies associated with stratigraphic correlations, mineral deposit investigations, or paleogeographic interpretations. The method is based on the ability of saturated benzidine (C12H12N2) solution to produce a blue stain on montmorillonite-bearing tuff grains. The method is substantiated by the results of microscopic, X-ray spectrometer, and spectrographic tests which lead to the conclusion that: (1) the benzidine stain test differentiates grains of different composition, (2) the white or gray grains which are stained a uniform blue color are fragments of altered tuff, and (3) white or gray grains which stain in a few small spots [...]

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Author :
R.A. Cadigan
Publisher :
U.S. Geological Survey

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Type Scheme Key
local-index unknown tei174
local-pk unknown 70095716
series unknown Trace Elements Investigations

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journalTrace Elements Investigations
languageEnglish

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