Mathematics – Logic
Scientific paper
Mar 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959gecoa..15..284h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 15, Issue 4, pp.284-304
Mathematics
Logic
9
Scientific paper
The concentrations of Li, Rb, Cs, Pb and Tl have been determined spectrographically and Na and K by flame photometer in eighty-eight feldspars from the pre-Cambrian basement rocks of southern Norway. Bock types include gneisses, augengneisses, anatexe granites, diapire (post-orogenic) granites and small and large pegmatites. Analytical procedures are described. Normal K/Rb ratios are found except for those from some large pegmatite feldspars which are enriched in Rb, and feldspars from arendalites which are relatively impoverished. The latter effect is shown to be related to feldspar structure and bulk composition. Changes in the K/Rb ratio are traced with increasing differentiation in the Fevig diapire granite. Feldspare from small pegmatites are similar in composition to the country rock. Those from large pegmatites fall into three compositional groups. The trace element content of the feldspars seems in general to reflect the differences in geological conditions under which they were formed.
Heier Knut S.
Taylor Stephen R.
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