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タイトルヨミ
サンベ アズキバラ マイボツリン ニ キザマレタ カサイリュウ ノ キロク
日本語以外のタイトル
Estimation of emplacement temperatures of past pyroclastic flows using in situ carbonized wood:an example from the Sanbe-Azukibara buried forest,Shimane Prefecture
ファイル
言語
日本語
著者
澤田 順弘
中村 唯史
樫根 知夏子
佐藤 仁志
内容記述(抄録等)
Large standing trees which were buried in situ by Holocene volcaniclastic and debris flow deposits are exposed in the river floor at Azukibara,Shimane Prefecture.Some parts of the buried trees are black.Carbonization temperatures of surface samples from the trees and of wood fragments from within the pyroclastic flow deposits were estimated using recently developed H/C themlometry.One tree about 10 m in height shows differing color and carbonization temperatures,in ascending order:(1)Lowest part:ocher coloration(not heated or carbonized).(2)Lower part,buried in pyroclastic flow deposits:black,estimated temperature of 319-322℃.Carbonized wood from the pyroclastic flow deposits at this level is also black,and yields an emplacement temperature of 372℃.(3)Middle part:brown,262-275℃,below the lower limit for the thermometer.(4)Upper middle part:dark brown,334℃.Reworked carbonized wood in enclosing sandstone beds is black,and gives temperatures of 343-356℃.(5)uppermost part(top):brown,285-305℃.Parts 2 and 4 record shows that at least two pyroclastic flow events took place.Most of the pyroclastic deposits along the river have been eroded by later stream action or debris flows.Carbonization temperatures of wood buried in situ provide a useful method for estimation of emplacement temperatures of past pyroclastic flows.
掲載誌名
島根大学地球資源環境学研究報告
19
開始ページ
17
終了ページ
26
ISSN
13439774
発行日
2000-12-25
NCID
AA11455176
出版者
島根大学総合理工学部地球資源環境学教室
出版者別表記
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
資料タイプ
紀要論文
部局
(旧組織)大学院総合理工学研究科
備考
12-14,16+ / 1993+
徳岡隆夫教授退官記念論誌集
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