ISOTOPIC EQUILIBRATION AGE OF Sm-Nd WHOLE-ROCK SYSTEM IN THE NAPIER COMPLEX (TONAGH ISLAND), EAST ANTARCTICA

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概要

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• Whole-rock measurements of ^<143>Nd/^<144>Nd and ^<147>Sm/^<144>Nd are reported for gneisses which had undergone granulite-facies metamorphism in Tonagh Island from the Napier Complex, East Antarctica. Felsic and ultramafic gneisses in adjacent outcrops yield a well-defined isochron age of 2458±61 Ma with an initial ratio of 0.50897±0.00004 (initial εNd=-9.5±0.7). These gneisses show a granuloblastic microfabric overprinted by a pervasive intercrystalline texture. The negative εNd value suggests that the isochron age indicates re-equilibration of the isotopic system on a whole-rock scale at 2458±61 Ma. On the other hand, mafic gneisses which crop out as thin layers alternated with pelitic and felsic gneisses yield an isochron with an age of 3708±533 Ma. The mafic gneisses display a uniform granuloblastic texture. The age of 3708 Ma is older than c. 3070 Ma, which has been regarded as the earliest tectonothermal age in the complex. εNd values at 3708 Ma for individual mafic gneiss range from +1.3 to +3.3. The values are within the range of Archaean komatiites and basalts, suggesting that the mafic gneisses were derived from the depleted mantle at c. 3700 Ma.

• 国立極地研究所の論文

著者

• Kagami H

  Graduate School Of Science And Technology Niigata University

• Osanai Yasuhito

  Department of earth sciences, Okayama university

• OWADA Masaaki

  Department of Earth Sciences, Yamaguchi University

• Osanai Yasuhito

  Division Of Evolution Of Earth Environments Faculty Of Social Andcultural Studies Kyushu University

• Osanai Yasuhito

  Department Of Earth And Planetary System Science Okayama University

• Osanai Yasuhito

  Division Of Evolution Of Earth Environments Kyushu University

• Osanai Yasuhito

  Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University

• KAGAMI Hiroo

  Institute for Study of Earth's Interior, Okayama University

• Owada Masaaki

  Division Of Earth Sciences Graduate School Of Science And Technology Yamaguchi University

• Owada Masaaki

  Department Of Earth Sciences University Of Yamaguchi

• Osanai Y

  Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University

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