TY - JOUR
T1 - Weathering and precipitation after meteorite impact of Ni, Cr, Fe, Ca and Mn in K-T boundary clays from Stevns Klint
AU - Miyano, Yumiko
AU - Yoshiasa, Akira
AU - Tobase, Tsubasa
AU - Isobe, Hiroshi
AU - Hongu, Hidetomo
AU - Okube, Maki
AU - Nakatsuka, Akihiko
AU - Sugiyama, Kazumasa
PY - 2016
Y1 - 2016
N2 - Ni, Cr, Fe, Ca and Mn K-edge XANES and EXAFS spectra were measured on K-T boundary clays from Stevns Klint in Denmark. According to XANES spectra and EXAFS analyses, the local structures of Ni, Cr and Fe in K-T boundary clays is similar to Ni(OH)2, Cr2O3 and FeOOH, respectively. It is assumed that the Ni, Cr and Fe elements in impact related glasses is changing into stable hydrate and oxide by the weathering and diagenesis at the surface of the Earth. Ca in K-T boundary clays maintains the diopside-like structure. Local structure of Ca in K-T clays seems to keep information on the condition at meteorite impact. Mn has a local structure like MnCO3 with divalent state. It is assumed that the origin on low abundant of Mn in the Fe-group element in K-T clays was the consumption by life activity and the diffusion to other parts.
AB - Ni, Cr, Fe, Ca and Mn K-edge XANES and EXAFS spectra were measured on K-T boundary clays from Stevns Klint in Denmark. According to XANES spectra and EXAFS analyses, the local structures of Ni, Cr and Fe in K-T boundary clays is similar to Ni(OH)2, Cr2O3 and FeOOH, respectively. It is assumed that the Ni, Cr and Fe elements in impact related glasses is changing into stable hydrate and oxide by the weathering and diagenesis at the surface of the Earth. Ca in K-T boundary clays maintains the diopside-like structure. Local structure of Ca in K-T clays seems to keep information on the condition at meteorite impact. Mn has a local structure like MnCO3 with divalent state. It is assumed that the origin on low abundant of Mn in the Fe-group element in K-T clays was the consumption by life activity and the diffusion to other parts.
UR - http://www.scopus.com/inward/record.url?scp=84978755582&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84978755582&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/712/1/012097
DO - 10.1088/1742-6596/712/1/012097
M3 - Conference article
AN - SCOPUS:84978755582
SN - 1742-6588
VL - 712
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012097
T2 - 16th International Conference on X-Ray Absorption Fine Structure, XAFS 2015
Y2 - 23 August 2015 through 28 August 2015
ER -