A study on the interaction between ferric ion and silicic acid in hydrosphere: Si-containing ferruginous deposits formed in neutral hot spring waters

Gaowa Naren, Akane Miyazaki, Motoyuki Matsuo, Shuqin Bai, Kotaro Yonesu, Yoshihiro Okaue, Takushi Yokoyama

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)27-34
Number of pages8
JournalChinese Journal of Geochemistry
Volume32
Issue number1
DOIs
Publication statusPublished - Mar 1 2013

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

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