Rare earth element concentrations in a suite of basanitoids and alkali olivine basalts from Grenada,Lesser Antilles |
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Authors: | N Shimizu R J Arculus |
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Institution: | (1) Department of Terrestrial Magnetism, Carnegie Institution of Washington, 20015 Washington, D.C.;(2) Geophysical Laboratory, Carnegie Institution of Washington, 20008 Washington, D.C.;(3) Present address: Institut de Physique du Globe, Université Paris VI, 4 Place Jussieu, F-75230 Paris, France |
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Abstract: | A suite of basanitoids and alkali olivine basalts from Grenada, Lesser Antilles were analyzed for rare earth elements. The REE concentrations of these rocks are characterized by a small variation in the heavy REE (7 to 9 times chondrite) and a large variation in the light REE (17 to 93 times chondrite). Among the possible mechanisms to account for the REE variations, fractional crystallization processes at low and high pressures, and partial melting processes (both batch melting and fractional melting) were examined, using the partition relationships of REE among silicate minerals and melts. It is suggested that the observed REE variations are best explained by variable degrees of batch partial melting, in which garnet is present as one of the solid phases through 2 to 17% melting of a garnet lherzolite parent rock. |
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