1964
A note on the geochemistry of alkaline rocks.
44
2
197-203

Geochemical differences between nepheline syenites of most probable magmatic origin are pointed out and discussed. It is tentatively suggested that concentration of R.E., Zr, Nb and related elements in some nepheline syenites signifies crustal contamination, or derivation, of the magma.

The high Ba and Sr contents together with high K/Rb and K/Cs ratios in many of these rocks may reflect the initial conditions of their parent magma.

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