Geochemical Studies in the District of Mt. Norikura (II):On the Chemical Composition of the Waters of Alpine and Subslpine Lakes
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The waters of the mountain lakes in the non-vegetated rocky region of Mt. Norikura (about 2, 700-2, 800 m above sea level) have the composition in chemical constituents similar to atmospheric precipitations just like as in the ponds situated on the Ozegahara moor. The evaporation residue is about 10 mg/l in general and the soluble state silicon content is so small-less than 0.3 mg/l generally-that as the weathering effect by precipitations has not yet appeared. But the water of Lake Ohniuike in the forest region at about 2, 400 m above sea level indicates that there is remarkable influence of weathering action. The soluble state silicon content has increased up to 3.9 m/1, and the evaporation residue and the sulphate ion content have become 3-4 times greater ; K/Na. ratio has decreased, while Ca/Mg ratio has increased. It will be known from these values that the nature of the waters approached to that of the water of the River Jintsu at Toyama City. The river system of the slope of Mt. Norikura where there are situated the lakes mentioned in this paper belongs to the Jintsu River.
- 日本陸水学会の論文
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