Abstract
Petrographical and chemical studies of the Paleozoic volcanic rocks in the Kitakami mountainland were carried out. The rocks from the lower Carboniferous show the assemblage of greenschist facies and contain secondary albitized low-temperature form plagioclase. The Permian volcanic rocks have remained in the grade lower than greenschist faceis, having primary high-temperature form plagioclase.Chemically, volcanic rocks of the pre-Upper Devonian Motai Group belong to alkali basalt, those of the Arisu Formation in the lower Carboniferous belong to tholeiite and those of the Ubaishi Formation in the Permian belong to high-alumina basalt. Volcanic rocks of the post Carboniferous in the district are rather rich in K2O and poor in TiO2, and have no oceanic character.
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Schedule a callMore From: The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
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