沈殿板からレイニアール山の下の溶融と流体のための表面への経路
R Shane McGary1, Rob L Evans1, Philip E Wannamaker2
1Department of Geology and Geophysics, MS#22, Woods Hole Oceanographic Institution, 360 Woods Hole Road, Woods Hole, Massachusetts 02543, USA.
Nature
|July 18, 2014
まとめ
この研究は,マグマ形成の完全な経路と,マウント・マウントの下の上昇を明らかにしています. レーニエは,磁気テロル学的データを用いた. 浮揚板から流体が放出され,マントルのが溶け,マグマが地殻の貯水池に運ばれる様子を可視化しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 火山学 火山学とは
- テクトニクス (地質学) とは
背景:
- 収束縁火山は,上層マントルの部分的な融解によって引き起こされる.
- 融解は,アディアバティック解圧またはシブダクティングスラブからの流体誘発的流出によって発生します.
- マグマの経路を理解することは,火山の危険性を評価する上で極めて重要です.
研究 の 目的:
- サブダクション設定で流体溶融相の完全な経路をイメージする.
- マグマ生成のメカニズムとマグマ山の下の上昇を調査する. ラニエールです.
- 地下流体と融解のダイナミクスに対する強化された制約のために地球物理学的データを統合する.
主な方法:
- マグネトテルルリック (MT) データの取得 ワシントン州中部,米国.
- MTの逆転にコロッケ化された地震調査の制約を組み込む.
- 流体と溶融の分布を線引きするために,電気伝導性の3Dイメージング.
主要な成果:
- 潜水板から流体放出が確認された.
- 地図化された流体移動が,上層のマントル・ケイジ (mantle wedge) に入る.
- 溶けたマグマがケイン内で溶け,マウントの下の地殻貯水池に輸送される. ラニエールです.
結論:
- この研究は,岩盤の脱水から地殻の貯蔵までのマグマの旅の全過程を成功裏にイメージした.
- MTと地震データを組み合わせると,潜水域マグマ管道に関する前例のない詳細が得られます.
- これらの発見は,火山のプロセスに関する私たちの理解を,収束する縁で強化します.
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