TY - JOUR
T1 - Local structure of Zn in Cretaceous-Tertiary boundary clay from Stevns Klint
AU - Okube, Maki
AU - Sasaki, Satoshi
AU - Yoshiasa, Akira
AU - Wang, Ling
AU - Nakatani, Tomotaka
AU - Hongu, Hidetomo
AU - Murai, Kei ichiro
AU - Nakatsuka, Akihiko
AU - Miyawaki, Ritsuro
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
KW - EXAFS
KW - K-T boundary clay
KW - Local structure of Zn
KW - XAFS
KW - XANES
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U2 - 10.2465/jmps.110606b
DO - 10.2465/jmps.110606b
M3 - Article
AN - SCOPUS:84871424584
SN - 1345-6296
VL - 107
SP - 192
EP - 196
JO - Journal of Mineralogical and Petrological Sciences
JF - Journal of Mineralogical and Petrological Sciences
IS - 5
ER -