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
- ,
- ,
- ,
- ,
- 巻
- 28
- 号
- 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
- ID情報
-
- DOI : 10.1029/2000GL012426
- ISSN : 0094-8276
- CiNii Articles ID : 80012432232
- Web of Science ID : WOS:000169849500013