Other
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1811w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Nov. 1980, p. 1811-1823. Research supported by the Macquarie University and Australia
Other
29
Carbonaceous Chondrites, Earth Mantle, Planetary Evolution, Rare Earth Elements, Volcanoes, Abundance, Basalt, Geochemistry, Magma, Mineral Deposits, Trace Elements
Scientific paper
REE distributions of an unusual suite of mantle-derived amphibole/apatite rich xenoliths have very steep, LREE-enriched chondrite-normalized patterns with no Eu anomalies. These are closely analogous to REE distributions of carbonatitic and kimberlitic rocks. A wide range in absolute abundances of REE reflects the varied mineral assemblages of this xenolith suite and, together with other trace element and volatile concentrations, supports an origin by fractionation of, or separation from, a volatile-charged LIL-enriched (possibly kimberlitic/carbonatitic) magma. Such a magma could be a medium for volatile transfer, addition of Ti, V, K and Rb and LREE enrichment within the upper mantle. It is postulated that such metasomatism in the upper mantle is a necessary precursor to continental alkaline volcanism.
Rogers Nick W.
Wass Suzanne Y.
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