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- W840412722 abstract "The content of major and trace elements, Rb-Sr isochron age and Sr-Nd isotope composition were determined for hornblende-biotite granodiorite in the Cheongsan area, the southeastern part of the Ogcheon Fold Belt, Korea. The hornblendebiotite granodiorite intrudes the shale zone of the Pyongan supergroup, and is in contact with the Cheongsan granite by a fault. The geochemical characteristics of this hornblende-biotite granodiorite indicate to have crystallized from a calc-alkaline series and to have been enriched in alkali elements by magmatic differentiation. 'they appear to be formed at the environment of continental or island arc. The isotopic compositions of the hornblende-biotite granodiorite give a defined Rb-Sr whole rock isochron age of 305±22 Ma(2σ) corresponding to the Carboniferous period with the Sr initial ratio of 0.70920±0.00013. ^(143)Nd/^(144)Nd ratios, eNd and eSr values range from 0.511753 to 0.511902, -10.4∼-13.4, and +67.5∼+77.5, respectively. Model ages were calculated to be 1.61.9 Ga. The isotopic data of hornblende-biotite granodiorites in the study area indicates that their source material may have been derived from partial melting of continental crust materials." @default.
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- W840412722 date "1999-01-01" @default.
- W840412722 modified "2023-09-24" @default.
- W840412722 title "Petrochemistry and Sr . Nd Isotopic Composition of Hornblende-Biotite Granodiorite in the Cheongsan Area, Korea" @default.
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