A study on the interaction between ferric ion and silicic acid in hydrosphere: Si-containing ferruginous deposits formed in neutral hot spring waters
Chinese Journal of Geochemistry, ISSN: 1000-9426, Vol: 32, Issue: 1, Page: 27-34
2013
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Article Description
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. © 2013 Science Press, Institute of Geochemistry, CAS and Springer-Verlag Berlin Heidelberg.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84871798490&origin=inward; http://dx.doi.org/10.1007/s11631-013-0603-9; http://link.springer.com/10.1007/s11631-013-0603-9; http://link.springer.com/content/pdf/10.1007/s11631-013-0603-9; http://link.springer.com/content/pdf/10.1007/s11631-013-0603-9.pdf; http://link.springer.com/article/10.1007/s11631-013-0603-9/fulltext.html; https://dx.doi.org/10.1007/s11631-013-0603-9; https://link.springer.com/article/10.1007/s11631-013-0603-9; http://www.springerlink.com/index/10.1007/s11631-013-0603-9; http://www.springerlink.com/index/pdf/10.1007/s11631-013-0603-9
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