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Alteration Minerals in the Yamanokuchi Area; Iriki Town, Kagoshima Prefecture

The Yamanokuchi Formation in Iriki Town, Kagoshima Prefecture is composed of a tuffaceous lacustrine deposit, and was considered to be subjected to alteration. Clay minerals as altered minerals in the Yamanokuchi Formation were examined by using a X-ray diffractometer, a scanning electron microscope, a differential thermal ● analyser, and an infrared absorption spectrometer. Various clay minerals such as vermiculite, chlorite, kaolin minerals, smectite, and mixed layer minerals were present in the Yamanokuchi Formation. The distribution of these minerals in this area was clarified.