クリープ・キャビテーションは,ダクティル・シャー・ゾーンでダイナミックな粒状流体ポンプを確立することができます
F Fusseis1, K Regenauer-Lieb, J Liu
1School of Earth & Environment, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia. fusseis@cyllene.uwa.edu.au
Nature
|June 19, 2009
まとめ
液体の移動と地殻の真ん中の切断地帯における岩石の変形は関連しています. 新しいモデルでは,シンデフォーメーションによる多孔性の生成が,地震や鉱物埋蔵に不可欠な流体流れをどのように駆動するかを示しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
- 地質化学 地質化学
背景:
- 地殻の中央のシェアゾーンにおける流体移動と岩石変形の相互作用は,地震の核形成,沈下の開始,鉱石堆積の形成に不可欠です.
- 古典的なモデルは,熱い,柔らかい中部地殻における流体移動を説明できず,そこでは,破裂による持続的浸透性と均衡の濡れ角が適用できない.
研究 の 目的:
- 中間地殻切断地帯における流体移動と孔性の生成を制御するメカニズムを調査する.
- 結合された機械的および化学的プロセスによって駆動されるシンデフォーメーション流体移動のための新しいモデルを開発する.
主な方法:
- 高解像度のシンクロトロンX線トモグラフィー.
- スキャン電子顕微鏡.
- "粒状流体ポンプ"モデルの構想.
主要な成果:
- シンデフォーメーション性多孔性の生成を制御する機械的および化学的ポテンシャルに関する証拠を提示した.
- 粘性粒子の境界の滑り込み,クリープの空洞化,溶解,降水による浸透性多孔性のダイナミックな生成を実証するモデル.
- シンデフォーメーション流体移動は,エントロピーの生成によって駆動される自己持続的なプロセスとして提案されています.
結論:
- "粒状流体ポンプ"モデルは,中部地殻を通る流体移動を説明しています.
- このプロセスは,クリープ・レジームにおけるストレスの局所化に不可欠であり,プレートテクトニクス,鉱石堆積形成,マントルの脱ガス,地震核形成に影響を与える.
- 発見は,中部地殻のクリープの不安定性を理解するための重要な要素を提供します.
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