山梨県増富温泉における温泉沈殿物の化学組成 [in Japanese] Chemical composition of the spring deposits from the Masutomi spring, Yamanashi Prefecture [in Japanese]
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The ferruginous and calcareous spring deposits collected from Niusawa, Togetsuan and Tsuganero, Masutomi spring district, Yamanashi Prefecture, were analyzed and the chemical characteristics, change in chemical composition during the flow and the relationship between the spring water and the deposit were studied. (1) Near the outlet, there are ferruginous deposits which contain much amount of SiO<sub>2</sub>, Na<sub>2</sub>O, K<sub>2</sub>O, P<sub>2</sub>O<sub>5</sub>, Cu, Zn, Ba and Ra. On the other hand, calcareous deposits are at the downflow, contain much amount of MgO. (2) At Niusawa, the contents of Na<sub>2</sub>O, K<sub>2</sub>O, P<sub>2</sub>O<sub>5</sub>, Cu, Ba, and Ra decreased with the distance from the outlet, which are correlated with the content of Fe<sub>2</sub>O<sub>3</sub>. While SiO<sub>2</sub> is abundant in the ferruginous deposits, Si/Fe ratio increased with the distance from the outlet. It is inferred that the amount of coprecipitated SiO<sub>2</sub> depends on the pH of the spring water. (3) The spring water temperature as well as the concentrations of Fe<sup>2+</sup>, HCO<sub>3</sub><sup>-</sup> and Ca<sup>2+</sup> decreased and pH increased during the flow. Calcium carbonate is in supersaturation. Its ion activity product is 3 times larger at inlet and 27 times larger at calcareous deposit than its solubility product. The Sr distribution coefficient between calcium carbonate and spring water is 0.17 which is in good agreement with the other data obtained from calcite.
Chikyukagaku 23(2), 77-83, 1989
The Geochemical Society of Japan