南会津針生地域の続成変質 : 変質鉱物の分帯について

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The Neogene Tertiary system in the Haryuu area is comosed of the Komadotoge welded tuff of Pleistocene, the Kamagoezawa tuff and tuffaceous mud stone of Upper Miocene and the Azabu silty tuff of Middle Miocene. In these rocks clay and non-clay minerals such as smectite, chlorite, zeolites and silica minerals are detected by using the powder Xray diffraction method. These minerals are grouped into the four zones judging from the mineral assemblages. Their distributions and lithology almost correspond to those of the Komadotoge. Kamagoezawa and Azabu formations. The zones and formations are correlated as follow ; [table] The zeolite-smctite zone seems to be divided into clinoptilolite and modenite sub-zone. The non-altered zone shows no evidence of being altered by diagenesis, because any diagenetic altered minerals cannot be detected mineralogically by X-ray method. The rocks in the volcanic glass-smectite and zeolite-smectite zones show the almost similar lithofacies and chemical compositions, so that they seem to be formed succesively by a burial diagenetic alteration. On the other hand, the albite-sericite-zone seems to be formed diagenetically from an other original material in a different sedimentary environment. The zonal distribution of alteration products in this area seems to be formed basically by the diagenetic process, but some hydrothermally altered and weathered minerals are found locally in some parts.
日本粘土学会の論文
1983-08-25

南会津針生地域の続成変質 : 変質鉱物の分帯について

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