グラニットマグマの形成,輸送,地殻の埋め込みについて
N Petford1, A R Cruden, K J McCaffrey
1Centre for Earth and Environmental Science Research, Kingston University, Surrey, UK. n.pet@kingston.ac.uk
Nature
|December 29, 2000
まとめ
グラニット形成には,古い理論に挑戦する,重要な岩の変形が含まれています. 新しい研究は,花岩のマグマティズムが,地質学的な設定に関係なく,速い,ダイナミックなプロセスであり,遅くないことを示しています.
科学分野:
- 地質学 地質学 地質学
- ペトロロジー・ペトロロジーとは
- 地質化学 地質化学
背景:
- 伝統的に,花岩の起源は,石油学者や地化学者によって研究されました.
- 最近のコンセンサスは,花岩の敷設における変形の重要な役割を強調しています.
- 既存の地質学モデルは,非現実的な地質学的な仮定や地質学的データの不十分な説明のために課題に直面しています.
研究 の 目的:
- グレナイトの石化形成の確立されたモデルを再評価する.
- シリカ濃度の高い融解動力学に対する変形の影響を調査する.
- 石油学的観測を構造的および地質学的証拠と調和させる.
主な方法:
- マグマの流れに関する機械的考察の分析.
- 岩石とマグマのリオロジック行動の評価.
- 構造的および地質学的データの統合と地質学的モデル.
主要な成果:
- 変形は,シリカが豊富な溶液の分離,輸送,配置に不可欠です.
- 機械的原理は,花岩のマグマチズムがダイナミックで急速なプロセスであることを示唆しています.
- グラニットマグマティズムの時間スケールは,100,000年またはそれ以下と推定されています.
結論:
- グラニットマグマティズムは,変形によって引き起こされる急速でダイナミックなプロセスです.
- 確立された地質学的なモデルは,変形を組み込むために修正する必要があります.
- グラニットの配置を理解するには,連続流量と機械的要因を考慮する必要があります.
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