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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Siliceous deposits formed from geothermal water I. The major constituents and the existing states of iron and aluminium

Takushi Yokoyama, Yumi Sato, Yonezo Maeda, Toshikazu Tarutani, Ryuichi Itoi
Geochemical Journal, Vol. 27, No. 6, P. 375-384, 1993


In the deposition of siliceous material from geothermal water, a relationship between chemical compositions of geothermal waters and siliceous deposits was investigated. The results indicated that iron and aluminium were concentrated into these siliceous deposits. For the chemical state of the iron in the deposits, some oxides and oxyhydroxides, sulfide and amorphous iron silicate were identified by powder X-ray diffraction and 57Fe Mössbauer spectroscopy. For the aluminium, two states were detected by 27Al MAS NMR: 6-coordinate aluminium (such as aluminium hydroxide) and 4-coordinate aluminium substituting a Si atom site in the deposit. In some deposit samples, both 4 and 6-coordinate aluminium were detected, but in others only the former was found.

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