Abstract
There are two groups of rocks in the Kayanoki area, Amakusa County; the Cretaceous sediments of the Himenoura group, and rhyolite dikes of Miocene epoch. The Himenoura group consists principally of shale, sandstone, and conglomerate. The rhyolite dikes intruding the Himenoura group are partly or entirely altered and have been mined as potter's clays. The potter's clays are composed of quartz, sericite, kaolinite, plagioclase (Ab95-Ab85), potassium feldspar, and accessory pyrite, siderite, calcite, and apatite. Fine-grained sericite is a mixture of 1M and 2M1 polymorphs; coarse-grained muscovite is 2M1 polymorph. The latter is found in the intensively altered rhyolite dikes. The sedimentary rocks in contact with the altered rhyolite dikes contain more sericite and kaolinite than the other sedimentary rocks and are associated with the interstratified sericite-montmorillonite and chlorite-expandable layer.
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