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

Maki Okube, Satoshi Sasaki, Akira Yoshiasa, Ling Wang, Tomotaka Nakatani, Hidetomo Hongu, Kei ichiro Murai, Akihiko Nakatsuka, Ritsuro Miyawaki

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3 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)192-196
Number of pages5
JournalJournal of Mineralogical and Petrological Sciences
Issue number5
Publication statusPublished - 2012
Externally publishedYes


  • K-T boundary clay
  • Local structure of Zn
  • XAFS

ASJC Scopus subject areas

  • Geophysics
  • Geology


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