Geochemistry of peridotite xenoliths in alkali basalts from Jeju Island, Korea - Mines Saint-Étienne Access content directly
Journal Articles Island Arc Year : 2002

Geochemistry of peridotite xenoliths in alkali basalts from Jeju Island, Korea

Abstract

Ultramafic xenoliths in alkali basalts from Jeju Island, Korea, are mostly spinel lherzolites with subordinate amounts of spinel harzburgites and pyroxenites. The compositions of major oxides and compatible to moderately incompatible elements of the Jeju peridotite xenoliths suggest that they are residues after various extents of melting. The estimated degrees of partial melting from compositionally homogeneous and unfractionated mantle to form the residual xenoliths reach 30%. However, their complex patterns of chondrite-normalized rare earth element, from light rare earth element (LREE)-depleted through spoon-shaped to LREE-enriched, reflect an additional process. Metasomatism by a small amount of melt/fluid enriched in LREE followed the former melt removal, which resulted in the enrichment of the incompatible trace elements. Sr and Nd isotopic ratios of the Jeju xenoliths display a wide scatter from depleted mid-oceanic ridge basalt (MORB)-like to near bulk-earth estimates along the MORB-oceanic island basalt (OIB) mantle array. The varieties in modal proportions of minerals, (La/Yb)N ratio and Sr-Nd isotopes for the xenoliths demonstrate that the lithospheric mantle beneath Jeju Island is heterogeneous. The heterogeneity is a probable result of its long-term growth and enrichment history.

Dates and versions

emse-00613179 , version 1 (03-08-2011)

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Seong Hee Choi, J.I Lee, Chung-Hwa Park, Jacques Moutte. Geochemistry of peridotite xenoliths in alkali basalts from Jeju Island, Korea. Island Arc, 2002, 11 (4), pp.221-235. ⟨10.1046/j.1440-1738.2002.00367.x⟩. ⟨emse-00613179⟩
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