XAFS study of as in K-T boundary clays

Shunsuke Sakai, Akira Yoshiasa, Hiroshi Arima, Maki Okube, Chiya Numako, Tsutomu Sato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)


Local structure around arsenic atoms in K-T boundary clays was studied by As K-edge XAFS spectroscopy. The threshold E0 energy of As and the characterization of the white peak of XANES spectra agree well with the values of As(+5) minerals like Zn2(AsO4)2(OH) 22H2O and CaCu(AsO4)(OH) according to the comparison with several types of arsenic minerals. This indicates that arsenic is in a high oxidation state As(+5) and occupies the AsO4 tetrahedral site of a mineral in K-T boundary clays.

Original languageEnglish
Title of host publicationX-RAY ABSORPTION FINE STRUCTURE - XAFS13
Subtitle of host publication13th International Conference
Number of pages3
Publication statusPublished - 2007 Mar 27
EventX-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference - Stanford, CA, United States
Duration: 2006 Jul 92006 Jul 14

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


OtherX-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference
Country/TerritoryUnited States
CityStanford, CA


  • As in K-T boundary clay
  • Chemical species of as
  • Local structure of as
  • XAFS of as minerals

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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