書誌事項
- タイトル別名
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- Drilling into the Mantle: A Key to Prognosticating the Future of the Ocean Planet
- 海惑星の将来を考える : マントル掘削の意義
- ウミ ワクセイ ノ ショウライ オ カンガエル : マントル クッサク ノ イギ
- ─マントル掘削の意義─
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<p> Water circulation, along with plate subduction, is considered based on the stabilities of hydrous phases and pressure–temperature profiles of the sinking oceanic plate. Water in a rather hot slab like the present one may be largely liberated at shallow depths (< 150 km) and return to the ocean via. arc magmatism. On the other hand, stabilization of dense hydrous minerals under cooler conditions, which current subduction zones will soon experience, causes the transportation or reflux of seawater to the deep mantle, which reduces the total mass of surface seawater. Simple calculations accepting water contents in the subducting slab suggested by a recent seismic velocity structure model indicate that the Earth's oceans are likely to disappear ∼80 million years hence. Significant changes may happen such as the end of plate tectonics and the onset of snowball Earth, with associated catastrophes affecting life. The only way to confirm this picture of the future of the ocean planet Earth is to examine deep hydration taking place along the outer rise through direct analyses of the upper mantle across the Moho.</p>
収録刊行物
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- 地学雑誌
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地学雑誌 130 (4), 585-597, 2021-08-25
公益社団法人 東京地学協会
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詳細情報 詳細情報について
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- CRID
- 1390570950855611264
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- NII論文ID
- 130008091271
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- NII書誌ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL書誌ID
- 031683614
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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
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可
