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Seven pyroclastic flow deposits (Omine pyroclastic flows 1 to 7) have been found in a 250'-meter boring core from Omine-machi, Kagoshima City. The results of the petrographic study are as follows. Omi...ne 1 is identifiable with the Goino pyroclastic flow deposit (TANEDA & MrYACHI, 1969). Omine 2 is not correlative with any other pyroclastic flows in southern Kyushu. Omine 3 is characterized by the presence of phenocrystic hornblende. It is, therefore, correlative with pyroclastic flow 3 interbedded with the lower member of Nagano Formation. Omines 4 and 5 contain biotite phenocrysts characteristically. These two pyroclastic flows are, therefore, correlative with the upper member of the Nagano Formation which is also characlerized by lhe presence of biotite. Omines 6 and 7 are identifiable with the Upper Kakuto pyroclastic flow deposit and the Aira II pyroclastic flow deposit, respectively. Each pyroclastic flow deposits mentioned above will fill the role of a valuable key bed in compiling the Quaternary geologic history of southern Kyushu. Omines 1 to 5 are particularly important in defining the volcanic activities of the early Pleistocene age in Kyushu.続きを見る
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