In the present study, we investigated secondary products formed on the surface of altered basaltic glass from the sediment-basalt interface by multiple characterizations with EPMA, μXANES, μEXAFS, TEM, and EELS. μXANES and EPMA analyses showed that secondary products with high Fe abundance were precipitated on the surface of basalt glass and that the Fe species in the secondary product was dominantly composed of Fe(III) oxides, hematite, which was also agreeable with EELS result. Characterization by TEM and μEXAFS suggested that the hematite was nanoparticulate with particle size of 10–20 nm. This is the first study showing the occurrence of nanosized hematite as secondary products in altered basaltic glass, although there are many studies on the formation of Fe(III) (hydr)oxides in basalt alteration.
Bibliographical noteFunding Information:
This work is partly supported by fund from JSPS KAKENHI Grant Number 15H05330 . This work was performed with the approval of JASRI (Proposal No. 2014A1493, 2014B1267, and 2015B1452) and Photon Factory (Proposal No. 2014G617 and 2016G575).
All Science Journal Classification (ASJC) codes
- Geochemistry and Petrology