ログイン
言語:

WEKO3

  • トップ
  • ランキング
To
lat lon distance
To

Field does not validate



インデックスリンク

インデックスツリー

メールアドレスを入力してください。

WEKO

One fine body…

WEKO

One fine body…

アイテム

  1. 131 地震研究所
  2. 東京大学地震研究所彙報
  3. 60
  4. 3
  1. 0 資料タイプ別
  2. 30 紀要・部局刊行物
  3. 東京大学地震研究所彙報
  4. 60
  5. 3

Petrology of the Higashi-Izu Monogenetic Volcano Group

https://doi.org/10.15083/0000032886
https://doi.org/10.15083/0000032886
9d251752-e17c-4b44-ba14-7bb11c8208bd
名前 / ファイル ライセンス アクション
ji0603001.pdf ji0603001.pdf (3.1 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2008-05-30
タイトル
タイトル Petrology of the Higashi-Izu Monogenetic Volcano Group
言語 en
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
ID登録
ID登録 10.15083/0000032886
ID登録タイプ JaLC
その他のタイトル
その他のタイトル 東伊豆単成火山群の岩石
著者 葉室, 和親

× 葉室, 和親

WEKO 128217

葉室, 和親

Search repository
著者別名
識別子Scheme WEKO
識別子 128218
姓名 Hamuro, Kazuchika
著者所属
著者所属 東京大学地震研究所
抄録
内容記述タイプ Abstract
内容記述 The Higashi-Izu monogenetic volcano group is situated in the northeastern part of the Izu Peninsula and is composed of more than 70 monogenetic volcanoes scattered in the area 350km2 wide. Tephrochronological studies indicate that the volcanism of the Higashi-Izu monogenetic volcano group started 30,000 years ago and continued up until less than 3,000 years before present. Actually the activity possibly began much earlier than 30,000 years ago. The Si02 contents of the rocks from this volcano group show a bimodal distribution : i.e., one group in the range from 49 to 60 wt.% (basalts-andesites) and the other in the range from 68 to 74 wt.% (dacites). Phenocryst assemblages of the basalt-andesite group are olivine+plagioclase, olivine+plagioclase+clinopyroxene, and olivine+plagioclase+clinopyroxene+orthopyroxene. Andesites contain granitic xenocrysts (quartz, plagioclase, hornblende and opaques). The phenocryst assemblage of dacite is plagioclase+orthopyroxene+hornblende+magnetite+ilmenite. Dacite dome lavas contain basaltic xenocrysts (magnesian olivine, Ca-rich plagioclase and clinopyroxene). The rocks of the olivine+plagioclase assemblage are mostly confined to the northern part of the area and those of the olivine+plagioclase+clinopyroxene assemblage to the southern part of the area. The rocks of the olivine+plagioclase+clinopyroxene+orthopyroxene assemblage are concentrated in the eastern part of the latter. The rocks containing xenocrysts are mostly confined to the northeastern part of the area. Most of the rocks without xenocrysts of this volcano group fall within the high-almina basalt series field and those with phenocrysts fall in the tholeiitic rock series field in the Si02 versus total alkali diagram. The anhydrous melting expriments of basalts suggest that the unknown but limited amount of water enough to affect the phase relations was dissolved in the basaltic magmas before eruption. Most of the andesite magmas of the Higashi-Izu monogenetic volcano group were produced by the contamination of the basaltic magma with the granitic rocks constituting the crust under the Izu Peninsula. This is supported by the positive corelation between the amount of xenocrysts and the Si02 and Al2O3 contents and by rare-earth element data. The rocks showing evidence of such contamination are distributed mostly in the northeastern part of the region. Groundmass pyroxene assemblage changes from augite+pigeonite or augite+pigeonite+hypersthene in basalts to augite+pigeonite+hypersthene or augite+hypersthene in andesites. This change is related to the degree of contamination, the hypersthene-bearing assemblages being the product of a more advanced stage of contamination. Dacite magma was probably produced by the partial melting of the granitic rock constituting the crust by the heat of the basaltic magma. This is supported by the close occurrence of the basic and acidic magmas in time and place, the existence of basaltic xenocrysts in dacites and the existence of the granitic xenoliths and xenocrysts in basic magmas. Also this is suggested by the major element and rare-earth element data.
書誌情報 東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo

巻 60, 号 3, p. 335-400, 発行日 1986-02-07
ISSN
収録物識別子タイプ ISSN
収録物識別子 00408972
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AN00162258
フォーマット
内容記述タイプ Other
内容記述 application/pdf
日本十進分類法
主題Scheme NDC
主題 453
出版者
出版者 東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
戻る
0
views
See details
Views

Versions

Ver.1 2021-03-01 22:02:03.328891
Show All versions

Share

Mendeley Twitter Facebook Print Addthis

Cite as

エクスポート

OAI-PMH
  • OAI-PMH JPCOAR 2.0
  • OAI-PMH JPCOAR 1.0
  • OAI-PMH DublinCore
  • OAI-PMH DDI
Other Formats
  • JSON
  • BIBTEX

Confirm


Powered by WEKO3


Powered by WEKO3