Geochemistry and petrogenesis of spinel lherzolite xenoliths from Boeun,Korea |
| |
| Institution: | 1. Dipartimento di Scienze della Terra, dell''Ambiente e delle Risorse, Università di Napoli Federico II, Italy;2. School of Earth Sciences, The University of Melbourne, Victoria 3010, Australia;3. Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Pavia, Italy;1. Geosciences Montpellier, CNRS & Université Montpellier 2, F-34095 Montpellier, France;2. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (I.G.E.B.A.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Intendente Güiraldes 2160, C1428EGA, Ciudad Universitaria, Buenos Aires, Argentina;3. Geosciences Environnement Toulouse, CNRS & Université de Toulouse, F-31400 Toulouse, France |
| |
| Abstract: | Geochemical characteristics of spinel lherzolite xenoliths, enclosed in Miocene alkali basalt from Boeun, Korea, provide important clues for understanding the lithosphere composition, equilibrium temperature and pressure conditions, and depletion and enrichment processes of subcontinental lithospheric mantle beneath Boeun. The spinel lherzolite xenoliths with protogranular to porpyroclastic textures were accidentally trapped by the ascending alkali basalt magma. The spinel lherzolite xenoliths originated at depths between 50 and 63 km with equilibrium temperatures ranging from 847 to 1030 °C. These xenoliths may have undergone small degrees (1–2%) of partial melting and cryptic metasomatism by an alkali basaltic melt. Based on Sr and Nd isotope compositions, the subcontinental lithospheric mantle beneath Boeun was heterogeneous and similar to that beneath East China and Central Mongolia rather than the Japanese Island Arc. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
