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Water pumping in mantle shear zones
Jacques Précigout1, Cécile Prigent2, Laurie Palasse3
1Institut des Sciences de la Terre d'Orléans (ISTO), CNRS-UMR 7327, Université d'Orléans, Campus Géosciences, 1A rue de la Férollerie, 45071 Orléans Cedex 2, France.
Nature Communications
|June 9, 2017
Summary
Ductile flow dynamically controls water-rich fluid circulation in Earth
Area of Science:
- Geology
- Geophysics
- Tectonics
Background:
- Water is essential to geological processes and Earth's geodynamics.
- Understanding aqueous fluid distribution is key to comprehending water's impact on Earth.
Purpose of the Study:
- To demonstrate the dynamic control of ductile flow on water-rich fluid circulation in mantle shear zones.
- To investigate fluid accumulation and its relationship with creep mechanisms and strain localization.
Main Methods:
- Analysis of amphibole distribution as an indicator of water presence.
- Utilizing dislocation slip-systems in olivine as a proxy for syn-tectonic water content.
- Examining fine-grained layers and their relationship with creep mechanisms and fluid aggregation.
Main Results:
- Fluid accumulation observed around fine-grained layers dominated by grain-size-sensitive creep.
- Correlation between fluid aggregation and dislocation creep-accommodated strain in water-rich layers.
- Evidence of fluid-pressure-induced cracking in areas with high water content.
Conclusions:
- Ductile flow dynamically controls water-rich fluid circulation in mantle shear zones.
- Creep cavitation and phase nucleation during grain size reduction contribute to long-term fluid pumping.
- Findings illuminate the role of fluid reservoirs in both the crust and mantle.
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