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Title Transcription
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
Title Alternative
Estimation of emplacement temperatures of past pyroclastic flows using in situ carbonized wood:an example from the Sanbe-Azukibara buried forest,Shimane Prefecture
File
language
jpn
Author
Sawada, Yoshihiro
Nakamura, Tadashi
Kashine, Chikako
Sato, Hitoshi
Description
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.
Journal Title
島根大学地球資源環境学研究報告
Volume
19
Start Page
17
End Page
26
ISSN
13439774
Published Date
2000-12-25
NCID
AA11455176
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
徳岡隆夫教授退官記念論誌集
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