中国地方における三郡変成岩類と"非変成"古生界の地質学的関係
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概要
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A number of geological studies on the Paleozoic formations in the Chugoku province are critically reviewed, with special reference to the stratigraphical, structural and petrological relations between the Sangun metamorphic rocks and the "non-metamorphic″formations. Judging from the present state of knowledge, it seems possible to conclude that: 1) The Sangun metamorphic rocks can be defined as rocks showing apparent schistose fabric, along with folds on various scale, and the "non-metamorphic" Paleozoic formations as those showing original clastic fabric preserved and no or very week schistose fabric. 2) The Sangun metamorphic rocks are commonly overlaid by the "non-metamorphic" Paleozoic formations which are younger than the Pennsylvanian in age, but in most cases the two groups are bordered by fault. There seems no evidence to show that the Upper Permian formations underwent the Sangun metamorphism. The Sangun metamorphic terrain is extended beyond the tectonic boundary that is bordering between the Northern zone (characterized by rocks of calcareous facies) and the Central zone (characterized by basites) of the "non-metamorphic" Paleozoic formations in the Chugoku province. 3) The metamorphic facies series of the Sangun metamorphism is, radically, pumpellyite actinolite zone - glaucophane zone - epidote-actinolite zone - epidote-hornblende zone. The pumpellyite-actinolite zone is regarded as the lowest grade of the Sangun metamorphism. The prehnite-pumpellyite zone that was formerly proposed by HASHIMOTO (1964, 1966a) as the lowest grade one in the Sangun metamorphic terrain is now excepted from the facies series of the Sangun metamorphism. The prehnite-pumpeellyite facies rocks would have been resulted in the burial metamorphism as proposed by COOMBS (1961). Some of this facies rocks might have been crystallized concomitantly with the Sangun metamorphism, but the rest may be later products than the metamorphism.
- 日本地質学会の論文
- 1969-01-31
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