Magnesium and Oxygen isotope composition of the Muamsa and Weolaksan granites, Okcheon belt, Korea

抄録

Rare earth element (REE) patterns normalized by chondrite have been used as one of useful tools in geochemical and cosmochemical studies. Especially, REE tetrad pattern has been considered as an example of a specific REE fractionation in geologic systems such asevolved or highly-fractionated granites under the condition that the REE measurement were performed at reasonable precision and accuracy. The Muamsa, Weolaksan and Sokrisan granites(MWS granites) are ones of the Cretaceous granites in the South Korea, which are highly evolved, fractionated I?type granite with geochemical characteristics of A?type granite and REE-tetrad pattern. In order to understand 1) the behavior of magnesium and oxygen isotope system during the emplacement of the highly fractionated granite and 2) the relationship among magnesium and oxygen isotopes and REE tetrad effect, we investigated the geochemical characteristics of magnesium and oxygen isotope composition from the MWS granites.