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Heavy solution methord for determination of volcanic glass content in tephras and tephra-derived soils |
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| Authors: | Ichiro Yamada Sadao Shoji |
| Affiliation: | 1. Faculty of Agriculture , Tohoku University , Aoba-ku, Sendai , 981 , Japan;2. Division of Soil Science , National Institute of Agro-Environmental Sciences , Tsukuba , 305 , Japan;3. Faculty of Agriculture , Tohoku University , Aoba-ku, Sendai , 981 , Japan |
| Abstract: | Abstract Volcanic glass is the most important primary mineral for the tephra-derived soils because it is the most abundant and the most weatherable among the primary minerals. The chemical properties of volcanic glass in tephras are closely related to the rock types of tephras (Kobayashi et al. 1976; Yamada and Shoji 1983; Shoji 1986; Yamada 1988) and influence on the chemical and clay mineralogical properties of tephra-derived soils (Saigusa and Shoji 1986). |
| Keywords: | Andisols heavy solution method polarizing microscopic method tephra volcanic glass |