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Title: 古地磁気と全岩化学組成からみた桜島火山観測井ボーリングコア中の溶岩の対比
Other Titles: Correlation of Lavas on Drilled Cores from the Sakurajima Volcano, Inferred from Paleomagnetic and Chemical Features
Authors: 味喜, 大介  kyouindb  KAKEN_id
宇都, 浩三  KAKEN_name
周藤, 正史  KAKEN_name
石原, 和浩  KAKEN_name
Author's alias: MIKI, Daisuke
UTO, Kozo
SUDO, Masafumi
ISHIHARA, Kazuhiro
Keywords: 全岩化学組成
chemical composition
volcanic history
Sakurajima volcano
drilled core
Issue Date: 1-Apr-2003
Publisher: 京都大学防災研究所
Journal title: 京都大学防災研究所年報. B
Volume: 46
Issue: B
Start page: 835
End page: 840
Abstract: 桜島火山の観測井ボーリングコア中の溶岩や地表に露出する溶岩について蛍光X線法による主要元素組成分析を行った。これらの溶岩の主要元素組成は,コアの全長にわたって一様であったハルタ山観測井を除いて, コア内での古地磁気学的な区分および対比された地表溶岩ごとによい一致を示す。桜島北東に位置する新島観測井下部の溶岩の化学組成は,地表に噴出した安永溶岩よりは安永諸島溶岩に近い。また,リンやチタンの含量の多寡には噴出時期によって一定の傾向が見られる。
Whole-rock chemical composition of lavas are measured on drilled cores from observation wellsin Sakurajima volcano. Chemical features are consistent with previously obtained paleomagneticcorrelation, except the Harutayama observation well, at which a uniform chemical composition was found.A lava sample from bottom part of the Shinjima observation well showed similar chemical composition tothe An'ei Islands lava. Studied lavas are possible to be divided into four eruptive stages by their P2O5 andTiO2 contents and ages.
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