A New Classifi cation of Hot Spring Waters Welling Out in the Gora Buried Caldera Structure , Hakone , Japan
A New Classifi cation of Hot Spring Waters Welling Out in the Gora Buried Caldera Structure , Hakone , Japan
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日本箱根强罗埋火山口结构涌出的温泉水的新分类
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Yoshida
中科院分区：
文献类型：
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作者：
George;Kikugawa;Kazuhiro;Itadera;Akio;Yoshida
根据Cl、SO 4和HCO 3的浓度、浓度比和温度，对日本箱根戈拉埋藏破火山口构造区的温泉进行了新的分类。第1类温泉的特点是Cl浓度高、温度高;第2类温泉分布在Jyakotsu川周围，其特点是Cl浓度与SO 4浓度和温度成正比。另一方面，第3型和第4型温泉的特征在于Cl的浓度非常低，并且SO 4和HCO 3的浓度都不与温度成比例。3类温泉中SO 4的浓度高于HCO 3的浓度，4类温泉中SO 4的浓度低于HCO 3的浓度。与类型3和类型4相比，类型5中的Cl浓度相对较高，并且在表示阴离子Cl、SO 4和HCO 3之间的浓度比的三元图中，类型5的点被绘制在类型2的点的扩展区域中。第6类温泉与第1类、第2类温泉在三元图上没有明显区别，但在Li、Na浓度关系上差异明显。第1类和第2类分别与箱根现有热液系统模式中的第Ⅲ类和第Ⅳ a类热液系统基本对应。在该模型中，类型3、4、5、6被归类为第II组。认为3、4、5型热泉中的SO_4和部分HCO_3来源于火山气体，而5型热泉中Cl的包裹体则是由1型热泉的流入所引起的。被归类为第6类的温泉与箱根汤本和大平台观察到的热水沃茨相似，这些温泉都是从基底岩石中出来的。
Based on the concentrations of Cl, SO4 and HCO3 as well as their concentration ratios and temperatures, we propose a new classifi cation of hot springs welling out in the region of Gora buried caldera structure, Hakone, Japan. Hot springs of Type 1 are featured by high concentration of Cl and high temperature, and those of Type 2, which are distributed around Jyakotsu River, are distinguished from others by the characteristic that the concentration of Cl is proportional to the concentration of SO4 and temperature. On the other hand, hot springs of Types 3 and 4 are characterized by such facts that concentration of Cl is very low and neither of the concentration of SO4 and HCO3 is proportional to temperature. Concentration of SO4 is higher relative to that of HCO3 in hot springs of Type 3 and vice versa in those of Type 4. Concentration of Cl in Type 5 is relatively high compared to that in Types 3 and 4, and in the ternary diagram representing concentration ratios between the anions Cl, SO4 and HCO3, the points for Type 5 are plotted in the extended zone of the points for Type 2. Hot springs belonging to Type 6 are not clearly discriminated from those of Type 1 and Type 2 in the ternary diagram, but the diff erence is obvious in the relationship between concentrations of Li and Na. Type 1 and Type 2 almost correspond to Group III and Group IV a in the existing model of Hakone hydrothermal system, respectively. Types 3, 4, 5, 6 have been categorized as Group II in that model. We consider that origin of SO4 and a part of HCO3 in hot springs of Types 3, 4, 5 are attributed to volcanic gases and the inclusion of Cl in Type 5 is caused by infl ow of Type 1 hot springs. Hot springs classified into Type 6 are similar to thermal waters observed in Hakone-Yumoto and Ohiradai which well out from basement rocks.