Variation of ^(143)Nd/^(144)Nd in continental and oceanic igneous rocks and chemical zonation of the mantle

Abstract

Measurements of ^(143)Nd/^(144)Nd in igneous rocks have been continued as a means of studying the parental regions from which the magmas are derived. To test the model of a uniform source for crustal rocks through geologic time and distinct oceanic magma sources (DePaolo and Wasserburg GRL 3, 109, 1976) we have extended coverage of young samples to include basalts from ocean islands, mid-ocean ridges and continents, as well as carbonatites and a rhyolite. Initial ratios of two more dated ancient rocks have also been determined.

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