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학술대회자료
저자정보
Yuyoung Lee (Korea Basic Science Institute) Moonsup Cho (Chungbuk National University) Jeongmin Kim (Korea Basic Science Institute)
저널정보
대한지질학회 대한지질학회 학술대회 2021 추계지질과학연합학술대회
발행연도
2021.10
수록면
202 - 202 (1page)

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The fluid-fluxed melting of igneous protoliths provides an opportunity to assess the role of fluids during the high-temperature metamorphism and anatexis for the formation and reworking of continental crust. We combined multiple datasets of field, microstructural, geochemical, geochronological, and oxygen isotopic studies in order to investigate the fluid-fluxed melting of the Buncheon granitic gneiss, Yeongnam Massif, which is a representative for the Paleoproterozoic Korean arc complex. The Buncheon granitic gneiss, long known for its penetrative foliation in contrast to the occurrence of deformation-free Hongjesa granite, is typified by metatexitic migmatites containing (un)segregated leucosomes; but interestingly enough, neither melanosomes nor peritectic phases are associated with neosomes. The migmatitic gneiss underwent syn-kinematic wet melting via the reaction, plagioclase + K-feldspar + quartz + H²O = melt, at ~650-700° C and 4-5 kbar, particularly along a ca. 15 km-long and ca. 5 km-wide shear zone. The leucosomes are significantly variable in the contents of rare earth elements, Zr, Y and Th, and their Eu anomalies are either positive or negative. Such geochemical variations are attributed to the segregation and migration of melts together with the entrainment of residual phases. Sensitive high-resolution ion microprobe (SHRIMP) U-Pb ages of zircon and monazite were analyzed from three samples of migmatitic gneiss and leucosome. Zircons show oscillatory zonings in the absence of overgrowth rims and are dated at ca. 1.98-1.97 Ga, suggesting an Orosirian crystallization of igneous protoliths. On the ot ... 전체 초록 보기

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