Subduction of sediments

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Table of contents

I Introduction
I.1 Composition of subducting slab H2O content
Composition of slab serpentinites
I.2 Serpentinite dehydration in subduction zones and stability of hydrous phases
I.3 Composition of subduction fluid
I.4 Redox state of subduction zones
II Open questions and strategy
III Outline of the thesis
Chapter 1 Experimental techniques and analytical methods
1.1. Experimental techniques
1.1.1. High pressure experimental techniques.
1.1.2. Piston-cylinder experiments
1.1.3. Diamond anvil cell experiments
1.2. Analytical methods
1.2.1 X-ray Powder Diffraction (XRPD)
1.2.2 Scanning electron microscope
1.2.3 Electron probe microanalysis
1.2.4 Elemental and isotope ratio analysis of sulfur
1.2.5 X-ray absorption spectroscopy (XAS)
Chapter 2 Role of iron content on serpentinite dehydration depth in subduction zones: experiment and thermodynamic modeling
Abstract
Introduction
Methods
Results
Mineral assemblage
Mineral compositions
Mass balance
Thermodynamic modeling
Discussion
Mineral reactions during dehydration
Antigorite upper thermal stability limit
Continuous water release
Implications for subduction zone seismicity
Conclusions
Chapter 3 Behavior of Fe and S during serpentinite dehydration
3.1. Introduction
3.2 Consequences of Fe and S reduction during serpentinite dehydration: experimental study
Abstract
3.2.1 Introduction
3.2.2 Methods
3.2.3 Results
3.2.4 Discussion
3.2.5 Conclusions
3.3. Reduction of Fe during serpentine dehydration: in-situ observations
3.3.1 HDAC experiments
3.3.2 In-situ XANES and XRD experiments on lizardite-antigorite transition
3.4. Sulfur mobility during serpentinite dehydration
3.4.1 Introduction
3.4.2 Results and discussion
Chapter 4 Thermodynamic modeling
4.1. Introduction
4.2. Methods
4.3. Modeling CFMASH and CFMASH-Sulfur systems relative to experiments
CFMASH system
CFMASH + Sulfur system
4.4. Conclusions
4.5 Application of thermodynamics to natural systems modeling
Mantle wedge peridotite metamorphism above subduction zone: hydration in lithospheric mantle.
Conclusions and perspectives
Conclusions
Perspectives
References
Annex