Local structure of Zn in Cretaceous-Tertiary boundary clay from Stevns Klint

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概要

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• The local structure around zinc atoms in Cretaceous-Tertiary (K-T) boundary clay from Stevns Klint, Denmark, was studied by Zn K-edge XAFS spectroscopy. XAFS measurements were performed at the BL-12C and BL-9C beamlines at the Photon Factory in the High Energy Accelerator Research Organization (KEK), Japan. The local structure around Zn in the K-T clay resembles the framework structure of the tetrahedral ZnO4 site in the zinc silicate willemite, judging from first shell Zn-O and second shell Zn-cation distances [1.953(3) and 3.51(2) Å, respectively], X-ray absorption near edge structure (XANES) spectra, and radial structure function. The Debye-Waller factor σ2 of the K-T clay sample is similar to those for the tetrahedral sites in crystalline phases, where Zn occupies mainly tetrahedral sites. The local structure of Zn in the K-T clay is peculiar and differs from that found in many clay minerals.

著者

• Yoshiasa Akira

  Graduate School Of Science And Technology Kumamoto University

• Miyawaki Ritsuro

  Department Of Geology And Paleontology National Museum Of Nature And Science

• Okube Maki

  Material And Structures Lab. Tokyo Institute Of Technology

• Wang Ling

  Graduate School Of Science & Technology Kumamoto University

• Murai Kei-ichiro

  Department Earth and Space Science, Graduate School of Science, Osaka University, Osaka 560-0043, Japan

• NAKATSUKA Akihiko

  Faculty of Engineering, Yamaguchi University

• NAKATANI Tomotaka

  Graduate School of Science and Technology, Kumamoto University

• HONGU Hidetomo

  Graduate School of Science and Technology, Kumamoto University

• Sasaki Satoshi

  Materials and Structure Laboratory, Tokyo Institute of Technology, Nagatsuta 4259, Midori, Yokohama 226-8503, Japan

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