Chemical Variations in a Granitic Pluton and Its Surrounding Rocks.
New techniques of x-ray fluorescence spectrography have provided, for the first time, abundant data regarding chemical variability of granitic rocks on different scales. The results suggest that current designs of sampling plans for trend surface analysis should be modified; in particular several specimens, preferably drillcores, may be required at each locality.
Baird
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McIntyre
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Welday
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Madlem
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