@article{oai:nipr.repo.nii.ac.jp:00002846,
 author = {タイノショウ, ヨシアキ and カガミ, ヒロオ and ハマモト, タクジ and タカハシ, ユウヘイ and TAINOSHO, Yoshiaki and KAGAMI, Hiroo and HAMAMOTO, Takuji and TAKAHASHI, Yuhei},
 journal = {Proceedings of the NIPR Symposium on Antarctic Geosciences},
 month = {Sep},
 note = {P(論文), A Sm-Nd whole-rock isochron for five mafic gneisses at Mount Pardoe defines and age of 2595±262 Ma with an initial ^<143>Nd/^<144> Nd ratio of 0.50937±0.00024,which corresponds to an initial ε Nd value at that time +1.9. The initial ε Nd values for the felsic gneisses of the Mount Pardoe and Tonagh Island are -3.5 (-3.0&acd;-6.4) and -9.5 (-9.2&acd;-9.8), respectively which are low compared with that of CHUR (Chondritic Uniform Reservoir). This suggests that these rocks had a long crustal history before ca. 2500 Ma. The Sm-Nd ages obtained from the whole-rock samples do not represent the primary age, but correspond to the D_3-M_3 tectonothermal event. The difference in initial ε Nd value for the mafic gneisses of Mount Pardoe and Tonagh Island may reflect the different chemical compositions of the protolith. In the Rb-Sr whole-rock isochron diagram, the felsic gneisses at Mount Pardoe yield an age of 2919±233 Ma with an initial ^<87>Sr/^<86>Sr ratio of 0.70581±0.00027. Mafic gneisses at Mount Pardoe give an Rb-Sr whole-rock isochron age of 2908±216 Ma with an initial ^<87>Sr/^<86>Sr ratio of 0.70517±0.00098.},
 pages = {92--101},
 title = {PRELIMINARY RESULT FOR THE Nd AND Sr ISOTOPE CHARACTERISTICS OF THE ARCHAEAN GNEISSES FROM MOUNT PARDOE, NAPIER COMPLEX, EAST ANTARCTICA},
 volume = {10},
 year = {1997}
}