Clay Mineralogy of the Recent and Buried Soils derived from the Pleistocene Tephras ("Loams") at the Foot of the Ashitaka Volcano, Central Japan

Takeshi MATSUI, Ken-ichi SAITO
1971 The Quaternary Research (Daiyonki-Kenkyu)  
The clay mineralogical composition of the recent and buried soils derived from the upper column of the Quaternary tephras were analysed by means of the DTA and X-ray diffraction. The uppermost humified scoriaceous soils were characterized by allophane and Al-vermiculite. No gibbsite was detected. The middle part ranging from the uppermost Pleistocene to the recent was composed of fine and coarse (scoriaceous) tephras of various petrographic compositions and humified horizons on them.
more » ... ite and kaolinite were dominant accompanied. The clay mineralogy of the lower part (upper Pleistocene) was dominated by allophane. These results suggest that the weathering sequence of primary minerals of these tephras may follow the following stages.
doi:10.4116/jaqua.10.69 fatcat:mfsvxxyd2vhgzgluuiig6ep7hu