Search Results 1-11 of 11

  • Eruption Age of Nakajima Volcano at Kutcharo Caldera, Hokkaido, Japan : Tephrochronology of Nakajima Pumice  [in Japanese]

    後藤 芳彦 , 和田 恵治

    地学雑誌 127(2), 157-173, 2018

  • Eruption Age of Nakajima Volcano at Kutcharo Caldera, Hokkaido, Japan: Tephrochronology of Nakajima Pumice  [in Japanese]

    GOTO Yoshihiko , WADA Keiji

    … The caldera has three post-caldera volcanoes: Atosanupuri, Nakajima and Mashu. … Our new tephrostratigraphical survey suggests that a pyroclastic fall deposit (Nakajima pumice), which was extruded from Nakajima, is exposed at the western slope of Atosanupuri. … The deposit comprises dacitic pumice clasts (< …

    Journal of Geography (Chigaku Zasshi) 127(2), 157-173, 2018

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  • The 18-19ka Andesitic Explosive Eruption at Usu Volcano, Hokkaido, Japan

    GOTO Yoshihiko , SEKIGUCHI Yuko , TAKAHASHI Satomi , ITO Hayuru , DANHARA Tohru

    北海道南西部の有珠山東方に分布する有珠上長和テフラ(Us-Ka)は,下部の軽石層と,上部の細粒火山灰層からなる.軽石層は安山岩質の軽石と石質岩片からなり,軽石のSiO<sub>2</sub>量は61-62wt.%である.火山灰層は火山豆石を含み,マグマ水蒸気噴火により形成されたことを示す.Us-Kaテフラは,洞爺湖中島起源のNj-Osテフラを覆い,有珠外輪山溶岩に覆われる. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 58(4), 529-541, 2013

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  • Vertical structure and emplacement process of the North Unit of the Middle Miocene Kumano Acidic Rocks, Southwest Japan, inferred from the GSJ Kumano-Ichiura drill core  [in Japanese]

    Nakajima Takashi , Koizumi Naoji , Geshi Nobuo , Oikawa Teruki , Shinjoe Hironao , Miura Daisuke , Sumii Tomoaki , Shigematsu Norio , Kitagawa Yu-ichi

    熊野酸性岩に600メートルのオールコア・ボーリングを実施した.コアの回収率は95%を超え,地表から40 m以深ではほとんど風化変質を被っていない.600 mのコアのうち,地表から深度464.25 mまでは熊野花崗斑岩,464.25 mから600 mの孔底までは尾鷲白浜火砕岩類が分布し,464.25 mの両者の境界は貫入境界である.熊野花崗斑岩は境界近くの急冷部分を除いてはほぼ均質で,石英,斜長石, …

    The Journal of the Geological Society of Japan 116(7), 374-387, 2010

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  • A fission-track age from the Katsurane Facies in the Tentokuji Formation at Hanekawa, Akita, northeast Japan  [in Japanese]

    NAKAJIMA Takeshi , DANHARA Tohru , IWANO Hideki , YAMASHITA Tohru

    … Fission-track dating was carried out on zircon crystals in a pumice obtained from a tuffbed in the Katsurane Facies in the Tentokuji Formation at Hanekawa, Akita City. …

    The Journal of the Geological Society of Japan 109(4), 252-255, 2003-04-15

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  • Paleomagnetic Directions of the Aso-4 Tephra in Yamaguchi Prefecture, Southwest Japan  [in Japanese]

    FUJII Junko , NAKAJIMA Tadashi , ISHIDA Shiro , MATSUO Seiji

    山口県の中央部に分布する宇部火山灰層の古地磁気測定を行った.宇部火山灰層は,阿蘇4火砕流堆積物の周縁相であり,その下部層と上部層はそれぞれ阿蘇カルデラ西側の八女軽石流および鳥栖オレンジ軽石流に対比されている.<br>下部層の9地点と上部層の11地点で,安定な古地磁気方位が得られた.それぞれの層平均磁化方位はDm=1.7°W,Im-46.9°N,α<sub>95</su …

    The Quaternary Research (Daiyonki-Kenkyu) 39(3), 227-232, 2000-06-01

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  • Volcanic Eruptions and Hazards of Asama Written in Hirtorical Records  [in Japanese]

    Yukio HAYAKAWA , Hideko NAKAJIMA

    … A thin pumice layer intercalated between the 1108 scoria and the 1783 pumice can be correlated to a record of Pele's hair-fall in Kyoto in 1596. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 43(4), 213-221, 1998

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  • TL age of the Quaternary volcanic rocks and pyroclastic flow deposits around the Lake Toya, Hokkaido, Japan.  [in Japanese]

    TAKASHIMA Isao , YAMAZAKI Tetsuyoshi , NAKATA Eiji , YUKAWA Kimiyasu

    … TL ages of Nakajima lava dome in the caldera are 0.040, 0.041 and 0.045 Ma, and those of Toya Pyroclastic Flow Deposit are 0.103-0.134 Ma (average: 0.119 Ma for 6 samples). … TL ages of the Takinoue Pumice Flow Deposit (0.90 Ma) and the Sobetsu Pumice Flow Deposit (1.59 Ma) indicate them to be middle and early Pleistocene, respectively, although they were vaguely considered as Pliocene or Pleistocene in age. …

    JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY 87(5), 197-206, 1992

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  • Identification of the Sambe Kisuki Tephra found in Marine Terrace Deposits along Coastal Areas of Hokuriku District, and its Implications.  [in Japanese]

    TOYOKURA Isamu , OHMURA Kazuo , ARAI Fusao , MACHIDA Hiroshi , TAKASE Nobukazu , NAKADAIRA Keiji , ITO Takashi

    … occurs as airfall and water-laid ash associated with overlying drift pumice within the marine terrace deposits.<br>The tephra is characterized by 1) biotite-bearing rhyolitic ash, 2) pumiceous glass with an unusually low refractive index, ranging from 1.494 to 1.498, and with higher concentration of potassium than of sodium, 3) stratigraphic position underlain by the Aso-4 and Kikai-Tozurahara tephra layers.<br>The stratigraphic relationships between SK and well-dated marker tephra layers suggest that the tephra erupted between 80ka and 90ka …

    The Quaternary Research (Daiyonki-Kenkyu) 30(2), 79-90, 1991

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  • Fossil Rootless Fumaroles in the Noboribetsu Pumice Flow Deposits and Their Alteration Products in the Noboribetsu Formation, Kuttara Volcano, Southwestern Hokkaido, Japan

    Kawachi Shimpei , Ishii Jiro , Matsui Masaru , Miyasaka Seigo , Nakajima Masahiro , Kiminami Kazuo , Kontani Yoshihiro , Yamazaki Tetsuyoshi , Hanabusa Hiroshi , Kimura Gaku , Shuto Takami , Maniwa Ken

    Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy 18(3), 291-303, 1978-03

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  • Geology and Petrology of the Volcano Mashu Hokkaido, Japan

    KATSUI Yoshio

    … of the Kurile volcanic zone., In the late Pleistocene, after the piling up of the huge stratovolcano of Kutcharo, a tremendous amount of pumice and welded tuff of dacite was erupted., This was followed by the depression of the Kutcharo caldera (Krakatoan type of WILLIAMS) which measured 26×20km., in diameter., After the depression, the alluvial volcanoes of Mashu, Atosanupuri and Nakajima were formed along the fissure which trends NNW across the caldera., The somma of Mashu was constructed by alternate eruptions of lava …

    The Journal of the Geological Society of Japan 61(721), 481-495, 1955

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