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九州の新生代深成岩類・火山岩類・火砕岩類のフィッション・トラック年代の総括(2)

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概要 Ninety-one fission-track ages from the Cenozoic volcanic rocks and the pyroelastic flow deposits in Kyushu, which were reported by the author in several papers for the past thirteen years, have been c...ompiled in this paper. Six ages have also been newly added in the list. The fission-track ages from the volcanic rocks in the Kimbo and the Taradake volcanic areas range from approximately 0.2 to 6 Ma and 0.4 to 9 Ma', respectively. These ranges are too long time as the life of one volcano. It is,therefore, considered that many volcanic rocks coincidently gathered in the Kimbo and the Taradake areas. and made the complicated volcanic fields in those two areas. The fission-track ages of the three large-scaled pyroelastic flow deposits in southern Kyushu (the Upper Kakuto, the Lower Kukuto and the Goino), which were separately reported in the several previous papers by the author, have been compiled here. The ages of the Upper and the Lower Kakuto pyroclastic flow deposits are0.3±0.1±Ma and 0.3-0.4±0.1Ma, respectively. The age of the Goino pyroclastic flow deposit is 2-2.5Ma. Two fission-track ages from the Lower Pleistocene tuff beds (pyroclastic flow deposits) have been newly determined. The ages of the tuff beds in the Hitoyoshi Formation and the Nagano Formation are 1.4±0.4Ma and 2.1±0.5Ma. respectively. The ages of all the pyroclastic flow deposits, listed here, except the Aira and the Ata pyroclastic flow deposits, serve as important time markers in compiling the Quaternary geologic history of southern Kyushu.続きを見る

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登録日 2009.04.22
更新日 2017.07.18