MISC

2001年7月

A new type of intra-plate volcanism; young alkali-basalts discovered from the subducting Pacific Plate, northern Japan Trench

GEOPHYSICAL RESEARCH LETTERS
  • N Hirano
  • ,
  • K Kawamura
  • ,
  • M Hattori
  • ,
  • K Saito
  • ,
  • Y Ogawa

28
14
開始ページ
2719
終了ページ
2722
記述言語
英語
掲載種別
DOI
10.1029/2000GL012426
出版者・発行元
AMER GEOPHYSICAL UNION

Alkali pillow basalts were collected from the toe of the oceanward slope of the northern Japan Trench. These alkali-basalts formed as a result of a low degree of partial melting of Pacific Ocean mantle and rapid rise of the magma (no fractionation in shallow magma chambers). Reconstructing Pacific Plate motion based on Ar-40-Ar-39 age dates of 5.95 +/- 0.31 Ma for these basalts indicates that they erupted outboard of outer swell or forebulge of the Japan Trench in the NW Pacific. We suggest that these alkali-basalts represent a new form of intra-plate volcanism, whereby magmatic activity occurs off the forebulge of the downgoing Pacific slab, perhaps using conduits related to fracturing of the slab during bending prior to subduction.

リンク情報
DOI
https://doi.org/10.1029/2000GL012426
CiNii Articles
http://ci.nii.ac.jp/naid/80012432232
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000169849500013&DestApp=WOS_CPL
ID情報
  • DOI : 10.1029/2000GL012426
  • ISSN : 0094-8276
  • CiNii Articles ID : 80012432232
  • Web of Science ID : WOS:000169849500013

エクスポート
BibTeX RIS