RAPID ANALYSIS OF THE WEARDALE GRANITE

Abstract
Summary: X-ray fluorescence and spectrochemical analyses of twenty specimens of the Weardale Granite collected at intervals of fifty feet between 2,642 feet and 1,742 feet from the Rookhope borehole have demonstrated a significant chemical discontinuity at, or close to, a depth of 2,200 feet. The geochemical evidence is consistent with a magmatic origin for this discontinuity, in which the granite below 2,200 feet is a slightly later fraction than the granite above. It is unlikely that differentiation in situ would have yielded such an arrangement, and it would seem more probable that the granite has been emplaced in phases.

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