PRELIMINARY RESULT FOR THE Nd AND Sr ISOTOPE CHARACTERISTICS OF THE ARCHAEAN GNEISSES FROM MOUNT PARDOE, NAPIER COMPLEX, EAST ANTARCTICA

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概要

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• 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∿-6.4) and -9.5 (-9.2∿-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.

• 国立極地研究所の論文

著者

• Kagami H

  Graduate School Of Science And Technology Niigata University

• Hamamoto Takuji

  Graduate school of science and technology

• Kagami Hiroo

  Graduate School of Science and Technology, Niigata University

• Hokada Tomokazu

  National Institute Of Polar Research 10-3 Midori-cho Tachikawa Tokyo 190-8518 Japan

• Hamamoto T

  Dia Consultants Co. Ltd. Aichi Jpn

• Hamamoto Takuji

  Graduate School Of Science And Technology Niigata University

• TAINOSHO Yoshiaki

  Department of Natural Environment, Faculty of Human Development, Kobe University

• TAKAHASHI Yuhei

  Geological Survey of Japan, Hokkaido Branch

• Takahashi Yuhei

  Geological Survey Of Japan

• Takahashi Yuhei

  Geological Survey Of Japan Hokkaido Branch

• TAINOSHO YOSHIAKI

  Faculty of Human Development, Kobe University

• Kagami Hiroo

  Graduate School Of Natural Science And Technology Niigata University

• Tainosho Y

  Faculty Of Human Development Kobe University

• Tainosho Yoshiaki

  Department Of Natural Environment Faculty Of Human Development Kobe University

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