ジルコンは,地殻のマグマの流れを明らかにします

Luca Caricchi¹, Guy Simpson¹, Urs Schaltegger¹

¹Section of Earth and Environmental Sciences, University of Geneva, rue des Maraîchers 13, CH-1205 Geneva, Switzerland.

Nature

|July 25, 2014

まとめ

ジルコンの年齢分布は,地球の熱予算と地質現象を理解するために不可欠なマグマの流れを明らかにします. この方法は,マグマの量を正確に定量化し,地球温暖化と火山噴火や鉱石堆積の形成を関連付けています.

科学分野:

地質科学は地質科学である.
ペトロロジー・ペトロロジーとは
ジオクロノロジー (Geochronology) について

背景:

マグマ流は,惑星の熱調節,大陸の成長,火山活動,鉱石埋蔵の発生に不可欠です.
マグマ流の直接的な測定は,地表下のマグマの蓄積が大きいため,地球温暖化と地質学的プロセスの間のリンクを妨げ,困難です.

研究の目的:

ジルコンの年齢分布と熱モデリングを使用してマグマフローを正確に決定するための新しい方法を開発し,検証する.
ジルコン年代の人口と地殻内のマグマ流/量との定量的な関係を確立するために.

主な方法:

殻状マグマ岩におけるジルコンの年齢分布の分析.
ジルコンのジオクロノロジカルデータを熱モデリング技術と統合.
導出されたマグマ流量と体積の推定値と独立したデータとの比較.

主要な成果:

ジルコンの時代の人口の特徴は,マグマの流れと蓄積された量によって体系的に変化します.
開発された方法は,既存の推定値と一致する,正確なマグマ流量と体積の決定を提供します.
異なる地質現象 (ポルフィール堆積物,プルトン,大規模な噴火) は,異なるマグマの入力時間スケールと平均フローと関連しています.

結論:

ジルコンの年齢分布は,過去のマグマ流を再構築するための強力なプロキシを提供します.
改善されたマグマ流量データは,地質現象の頻度に関するグローバルな熱流量制御の理解を強化します.
このアプローチは,地球の鉱物資源の分布を左右する要因を明らかにするのに役立ちます.

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