書誌事項
- タイトル別名
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- Petrology of the oceanic island tholeiite-origin greenstones in the Shimamori Formation, North Kitakami belt, northeastern Japan.
- ホクブ キタカミタイ シマモリソウ ニ サンスル カイヨウトウ ソレイアイト キゲン リョクショクガン ノ ガンセキガク
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The North Kitakami belt in northeastern Japan is a Jurassic accretionary complex with abundant greenstones. The Shimamori Formation greenstones in the Hachinohe area, Aomori Prefecture, comprise basaltic massive lava, pillow lava and hyaloclastite associated with limestone as well as dykes of dolerite and gabbro. Association of these greenstones with limestone, without any chert, suggests their formation at a depth shallower than the carbonate compensation depth. Bulk rock major and trace element chemistry of these greenstones reveals that they are within-plate tholeiitic basalt enriched in Nb, Ti and LREE. The relic mineral chemistry such as Ti-poor (TiO2<1.3 wt.%) clinopyroxene and Cr-rich (Cr#=60) chromian spinel also supports “tholeiite” identification. These chemical and mineralogical characteristics indicate that the Shimamori Formation represents a seamount fragment mainly formed by within-plate tholeiitic (ocean island tholeiitic) magmatism, and accreted to the Eurasian continental margin through subduction process. The tholeiitic magmatism, however, is contrasting to the alkali basalt magmatism, which dominates the accreted greenstones in the main part of the North Kitakami belt to the south.
収録刊行物
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- 岩石鉱物科学
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岩石鉱物科学 30 (1), 1-16, 2001
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681502994560
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- NII論文ID
- 10006065023
- 120000810124
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- NII書誌ID
- AA1146088X
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- DOI
- 10.2465/gkk.30.1
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- COI
- 1:CAS:528:DC%2BD3MXktVCksr0%3D
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- ISSN
- 13497979
- 1345630X
- http://id.crossref.org/issn/1345630X
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- HANDLE
- 2297/7403
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- NDL書誌ID
- 5771902
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可