中央アメリカ海域沿いの窒素の潜水とリサイクル
Tobias P Fischer1, David R Hilton, Mindy M Zimmer
1Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, USA. fischer@unm.edu
まとめ
中央アメリカからの火山ガスには,窒素 (N) とヘリウム (He) のシグネチャーが特徴的です. グアテマラの火山は,沈殿した堆積物から重いNを示し,コスタリカの火山は,異なるマントルの源を示し,より軽いNを持っています.
科学分野:
- 地質化学 地質化学
- イソトープ地球化学 イソトープ地球化学
- 火山学 火山学とは
背景:
- 火山の放射は,地球の深い過程についての洞察を提供します.
- 火山ガスの窒素 (N) とヘリウム (He) の同位体は,マントルの源泉と地殻のリサイクルをたどることができます.
- 中米の火山の弧は,潜流ゾーンの動態を研究するためのユニークな環境を提供します.
研究 の 目的:
- 中米の火山弧の2つのセグメントからの揮発性物質の窒素 (N) とヘリウム (He) の同位体および相対的豊富性特性を特徴付けること.
- 弧火山の窒素 (N) の源を特定するために.
- 表面とマントルの間の窒素 (N) の循環における潜水地帯の役割を評価する.
主な方法:
- 火山ガスサンプルにおけるNとHeの同位体とN2/He比の分析.
- グアテマラとコスタリカの火山の弧の間の同位素と豊富さのデータの比較.
- 窒素 (N) サイクルをモデル化するための質量バランス計算.
主要な成果:
- グアテマラの火山ガスは,陽性デルタ15N値と高いN2/He比率 (25,000まで) を表しています.
- コスタリカの火山ガスは,負のデルタ15N値と低いN2/He比率 (最大1483) を示しています.
- グアテマラのマントルに浸透した浅い半平流の沈殿物は,重いNの源として特定されています.
結論:
- 沈殿した堆積物は,弧火山による大気中の窒素 (N) の重要な供給源である.
- サブドクションゾーンはバリアとして作用し,沈殿性窒素 (N) のより深いマントルへの移動を制限します.
- 異なる同位体シグネチャーは,グアテマラとコスタリカの弧における異なる潜水過程と沈殿物の寄与を反映しています.
関連する概念動画
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