PETROGENESIS OF THE META-TRONDHJEMITES FROM CAPE HINODE, EAST ANTARCTICA

• Main Authors: イケダ, ヤスオ, シライシ, カズユキ, ヤナイ, ケイゾウ, IKEDA, Yasuo, SHIRAISHI, Kazuyuki, YANAI, Keizo
• Language: English
• Published: National Institute of Polar Research 1997
• Subjects: eclogite; Lutzow-Holm Complex; MORB; slab; trondhjemite; Cape Hinode; East Antarctica; Antarc*; Antarctica
• Online Access: https://nipr.repo.nii.ac.jp/record/2847/files/KJ00002368120.pdf; https://doi.org/10.15094/00002847; https://nipr.repo.nii.ac.jp/records/2847

P(論文) Meta-trondhjemites (ca. 1000 Ma) from Cape Hinode, Lutzow-Holm Complex (LHC), East Antarctica are characterized by relatively high Al (Al_2O_3>15% at 70% SiO_2) and Sr, and low Y and Yb contents, which are chemically similar to Archaean trondhjemites and adakites. Trace element modelings of the partial melting of MORB suggest that igneous protoliths of the meta-trondhjemites were derived by partial melting of a basaltic source material under garnet stability P-T conditions. We suggest that a young hot subducting plate along LHC at 1000 Ma may have reached elevated temperatures which initiated melting of the slab. departmental bulletin paper