Magma Redox Geochemistry

Explores the many facets of redox exchanges that drive magma's behavior and evolution, from the origin of the Earth until today

The redox state is one of the master variables behind the Earth's forming processes, which at depth concern magma as the major transport agent. Understanding redox exchanges in magmas is pivotal for reconstructing the history and compositional make-up of our planet, for exploring its mineral resources, and for monitoring and forecasting volcanic activity.

Magma Redox Geochemistry describes the multiple facets of redox reactions in the magmatic realm and presents experimental results, theoretical approaches, and unconventional and novel techniques.

Volume highlights include:

• Redox state and oxygen fugacity: so close, so far
• Redox processes from Earth’s accretion to global geodynamics
• Redox evolution from the magma source to volcanic emissions
• Redox characterization of elements and their isotopes

The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.

Roberto Moretti, Université de Paris, Institut de Physique du Globe de Paris, France

Daniel R. Neuville, Université de Paris, Institut de Physique du Globe de Paris, France

List of Contributors

Preface

1. Redox Equilibria: From Basic Concepts to the Magmatic Realm
Roberto Moretti and Daniel R. Neuville

Part I Redox from the Earth’s Accretion to Global Geodynamics

2. Redox Processes Before, During, and After Earth’s Accretion Affecting the Deep Carbon Cycle
Vincenzo Stagno and Sonja Aulbach

3. Oxygen Fugacity Across Tectonic Settings
Elizabeth Cottrell, Suzanne K. Birner, Maryjo Brounce, Fred A. Davis, Laura E. Waters, and Katherine A. Kelley

4. Redox Variables and Mechanisms in Subduction Magmatism and Volcanism
Katy A. Evans and Andy G. Tomkins

5. Redox Melting in the Mantle
Stephen F. Foley

Part II Redox at Work: From Magma Sources to Volcanic Phenomena

6. Ionic Syntax and Equilibrium Approach to Redox Exchanges in Melts: Basic Concepts and the Case of Iron and Sulfur in Degassing Magmas
Roberto Moretti

7. The Petrological Consequences of the Estimated Oxidation State of Primitive MORB Glass
Paul D. Asimow

8. Oxygen Content, Oxygen Fugacity, the Oxidation State of Iron, and Mid-Ocean Ridge Basalts
Andrew J. Berry and Hugh St.C. O'Neill

9. Chromium Redox Systematics in Basaltic Liquids and Olivine
Aaron Bell

10. The Thermodynamic Controls on Sulfide Saturation in Silicate Melts with Application to Ocean Floor Basalts
Hugh St.C. O’Neill

11. Redox State of Volatiles and Their Relationships with Iron in Silicate Melts: Implications for Magma Degassing
Nicole Métrich

12. Iron in Silicate Glasses and Melts: Implications for Volcanological Processes
Charles Le Losq, Maria Rita Cicconi, and Daniel R. Neuville

Part III Tools and Techniques to Characterize the Redox and its Effect on Isotope Partitioning

13. How to Measure the Oxidation State of Multivalent Elements in Minerals, Glasses, and melts?
Daniel R. Neuville, Maria Rita Cicconi, and Charles Le Losq

14. Oxidation State, Coordination, and Covalency Controls on Iron Isotopic Fractionation in Earth’s Mantle and Crust: Insights from First-Principles Calculations and NRIXS Spectroscopy
Marc Blanchard and Nicolas Dauphas

15. The Role of Redox Processes in Determining the Iron Isotope Compositions of Minerals, Melts, and Fluids
Paolo A. Sossi and Baptiste Debret

16. Zinc and Copper Isotopes as Tracers of Redox Processes
Edward C. Inglis and Frédéric Moynier

17. Mineral-Melt Partitioning of Redox-Sensitive Elements
Guilherme Mallmann, Antony Burnham, and Raul Fonseca

18. Titanomagnetite – Silicate Melt Oxybarometry
Róbert Arató and Andreas Audétat

19. The Redox Behavior of Rare Earth Elements
Maria Rita Cicconi, Charles Le Losq, Grant Henderson, and Daniel R. Neuville

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