Physics – Optics
Scientific paper
Oct 1956
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1956gecoa..10..224t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 10, Issue 4, pp.224-229
Physics
Optics
7
Scientific paper
Basalts, andesites, and trachytes from Bank's Peninsula (New Zealand), and granodiorites. felsites, and granophyres from Slieve Gullion (County Armagh), have K/Rb ratios in agreement with those of et al. (1952, 1954a) for a wide range of igneous rocks and meteorites. Unaltered granites from St. Austell (Cornwall), and the Mourne Mountains (County Down), and rhvolites from Bank's Peninsula, have significantly lower ratios (i.e., enrichment in rubidium lelative to potassium). It is concluded that these rocks have crystallized from an extremely differentiated magma. The abundances of Ba, Sr, and Zr lend some support to this hypothesis. Footnote-Glass optics; wavelength range 4600-9600 A; current, 3-amp d.c.; anode excitation; samples burnt to completion of alkali metal distillation; graphite electrodes, anode 2-4 mm diameter × 5 mm deep; slit 20 microns; step sector; Kodak II-N plates developed for 5 min in Kodak D-19B developer. Lines read with a Hilger nonrecording microphotometer.
Emeleus Henry C.
Exley C. S.
Taylor Stephen R.
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