Abstract
The coarse and fine-grained mineral fractions of a Mid-Atlantic Ridge sediment (22°N) have been separated and analyzed for Fe and rare-earth elements (REE). Despite changes in Fe abundance, all the chlorites have REE distributions consistent with a derivation from ridge greenstones. The REE distribution of the fine-grained montmorillonite is similar to that of shales, yet differs markedly from that of a coarse locally derived iron-rich montmorillonite. A continental origin for the fine-grained montmorillonite is implied.
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