変質鉱物の累帯分布と生成条件

抄録

Authigenic minerals, including clay minerals, have been formed at subsurface of the earth under very wide conditions. Practically the “zone” which is defined by assemblage of them is convenient for recognizing a restricted physicochemical condition. The comhnation, sequence, morphology, relation to stratigraphy and geologic structure of these zones indicate more details of varying conditions. The author cites an instance of various kinds of zoning which are constituted by the zones of zeolite-lay-ilica minerals, correlating to different alteration facies.