Variation in the chemical composition of Obuki Spring, Tamagawa Hot Springs (1951-2000)

Abstract

concentration. The concentrations of numerous cations increased during [1972][1973][1974][1975][1976][1977][1978][1979][1980][1981][1982][1983][1984][1985][1986][1987][1988][1989][1990], as did the SO 4 2-concentrations. This variation is thought to be the result of a mechanism involving a second source, namely, volcanic emanations of a sulfur-rich composition, which were temporarily added to emanations from the first source; the first source has continuously supplied volcanic emanations to the original acid hydrothermal solution at Obuki Spring, and the second source is responsible for the increase in SO 4 2-, Cl -, and acidity. Variations in the concentrations of most other components can be explained as the result of changes in the interaction between the acid hydrothermal solution and the surrounding rocks; the latter changes were themselves the consequence of increases in acidity.

The role of hydrous ferric oxide precipitation in the fractionation of arsenic, gallium, and indium during the neutralization of acidic hot spring water by river water in the Tama River watershed, Japan

“…1) was 9.42 mg/L in June 2009, 8.98 mg/L in November 2010, and 7.56 mg/L in July 2010 (Table EA1-3 in EA1). This variation is attributable to temporal changes in the chemical composition of the Obuki spring water (Yoshiike, 2003;Sanada et al, 2006). No difference was found in the B concentrations of the 0.2 lm fraction (0.45 lm in July), the <5 kDa filtrates, or the acid treatment samples, and this indicates that B behaved as a dissolved species throughout the study area (Table EA1- The increase in discharge inferred from the decreasing downstream B concentration is shown in Fig.…”

Natural pollutants of Northern Lake Baikal

“…Sulfate compositions are found in some hot springs, but they have rather alkaline than acidic chemistry. Note that sulfate waters with low or very low pH are common to some active hydrothermal fields (Ball et al 2010;Guo et al 2014;Sanada et al 2006;Yoshike 2003), but cold waters of such chemistry are very rare. Among these are acidic cold seeps that form the jarositerich Golden Deposit in Northwest Territories of Canada and perennial saline spring systems associated with three gypsum/anhydrite diapirs on Axel Heiberg Island, Nunavut, Canada (Battler et al 2013a, b).…”

我国台湾东北部龟山岛附近海域热液流体中的稀土元素组成及其对浅海热液活动的指示

“…如新西兰 Rotokawa 酸性地热水、黄石公园中的酸性 地热流体和台湾大屯火山区中的地热流体 [6,25,26] , 有 的通过深部蒸汽(CO 2 和 H 2 S)与浅部地下水混合形成, 例如新墨西哥 Valles 喷火山口中的酸性地热流体和 多米尼加酸性地热水 [27] , 还有的则是岩浆气 HCl 和 论 文 SO 2 释放的结果, 例如新西兰 Ruapehu 弹坑湖中的 酸性热水和日本 Tamagawa 地热区中的 Obuki 酸性热 泉 [11,25,28] ; (2) 中性氯流体, 可能具有岩浆组成, 通常 代表了地热区内的深部流体, 例如新西兰的 Waikite 地热流体和台湾大冈山热泉水 [6,29] ; (3) 碳酸氢盐-碳 酸盐流体, 该流体通过二氧化碳水与围岩相互作用 形成, 接近中性到碱性 [29,30] , 例如台湾红叶和清水热 泉水 [6] , 以及美国俄勒冈州、内达华州和加利福尼亚 州地热区中的热液流体 [9] .…”