TY - JOUR
T1 - A study on the interaction between ferric ion and silicic acid in hydrosphere
T2 - Si-containing ferruginous deposits formed in neutral hot spring waters
AU - Naren, Gaowa
AU - Miyazaki, Akane
AU - Matsuo, Motoyuki
AU - Bai, Shuqin
AU - Yonesu, Kotaro
AU - Okaue, Yoshihiro
AU - Yokoyama, Takushi
N1 - Funding Information:
nancially supported by the Interdisciplinary Programs in Education and the Projects in Research Development, Kyushu University.
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013/3
Y1 - 2013/3
N2 - Five ferruginous deposit samples formed from neutral hot springs were analyzed to determine whether they consisted of a mixture of silica, hydrous iron oxide or iron silicate by differential thermal analysis (DTA), infrared (IR) spectroscopy, powder X-ray diffraction (XRD), and 57Fe Mössbauer spectroscopy. The Si/Fe atomic ratios of the deposits ranged from 0. 25 to 0. 45, and were smaller than those of hisingerite (1-2), but apparently close to those of siliceous ferrihydrite (0. 25-0. 5). Si was confirmed to be present as monomeric or oligomeric silicate from the Si-O stretching vibration frequencies on the IR spectra. Judging from the results of DTA, which minerals starting to produce after heating, and a relationship between Si-O stretching vibration frequency and Si/Fe atomic ratio proposed by Henmi et al. (1981), all the deposits in this study were concluded to be mixtures of various siliceous ferrihydrites with low and high Si/Fe atomic ratios. Moreover, by comparing the chemical properties of hot spring waters, the formation conditions of siliceous ferrihydrite were also discussed.
AB - Five ferruginous deposit samples formed from neutral hot springs were analyzed to determine whether they consisted of a mixture of silica, hydrous iron oxide or iron silicate by differential thermal analysis (DTA), infrared (IR) spectroscopy, powder X-ray diffraction (XRD), and 57Fe Mössbauer spectroscopy. The Si/Fe atomic ratios of the deposits ranged from 0. 25 to 0. 45, and were smaller than those of hisingerite (1-2), but apparently close to those of siliceous ferrihydrite (0. 25-0. 5). Si was confirmed to be present as monomeric or oligomeric silicate from the Si-O stretching vibration frequencies on the IR spectra. Judging from the results of DTA, which minerals starting to produce after heating, and a relationship between Si-O stretching vibration frequency and Si/Fe atomic ratio proposed by Henmi et al. (1981), all the deposits in this study were concluded to be mixtures of various siliceous ferrihydrites with low and high Si/Fe atomic ratios. Moreover, by comparing the chemical properties of hot spring waters, the formation conditions of siliceous ferrihydrite were also discussed.
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U2 - 10.1007/s11631-013-0603-9
DO - 10.1007/s11631-013-0603-9
M3 - Article
AN - SCOPUS:84871798490
SN - 2096-0956
VL - 32
SP - 27
EP - 34
JO - Acta Geochimica
JF - Acta Geochimica
IS - 1
ER -