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.
List of Contributors vii Preface ix 1 Redox Equilibria: From Basic Concepts to the Magmatic Realm 1 Roberto Moretti and Daniel R. Neuville Part I: Redox from the Earth’s Accretion to Global Geodynamics 19 2 Redox Processes Before, During, and After Earth’s Accretion Affecting the Deep Carbon Cycle 21 Vincenzo Stagno and Sonja Aulbach 3 Oxygen Fugacity Across Tectonic Settings 33 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 63 Katy A. Evans and Andy G. Tomkins 5 Redox Melting in the Mantle 93 Stephen F. Foley Part II: Redox at Work: From Magma Sources to Volcanic Phenomena 115 6 Ionic Syntax and Equilibrium Approach to Redox Exchanges in Melts: Basic Concepts and the Case of Iron and Sulfur in Degassing Magmas 117 Roberto Moretti 7 The Petrological Consequences of the Estimated Oxidation State of Primitive MORB Glass 139 Paul D. Asimow 8 Oxygen Content, Oxygen Fugacity, the Oxidation State of Iron, and Mid-Ocean Ridge Basalts 155 Andrew J. Berry and Hugh St.C. O’Neill 9 Chromium Redox Systematics in Basaltic Liquids and Olivine 165 Aaron S. Bell 10 The Thermodynamic Controls on Sulfide Saturation in Silicate Melts with Application to Ocean Floor Basalts 177 Hugh St.C. O’Neill 11 Redox State of Volatiles and Their Relationships with Iron in Silicate Melts: Implications for Magma Degassing 215 Nicole Métrich 12 Iron in Silicate Glasses and Melts: Implications for Volcanological Processes 233 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 255 13 How to Measure the Oxidation State of Multivalent Elements in Minerals, Glasses, and Melts? 257 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 283 Marc Blanchard and Nicolas Dauphas 15 The Role of Redox Processes in Determining the Iron Isotope Compositions of Minerals, Melts, and Fluids 303 Paolo A. Sossi and Baptiste Debret 16 Zinc and Copper Isotopes as Tracers of Redox Processes 331 Edward C. Inglis and Frédéric Moynier 17 Mineral-Melt Partitioning of Redox-Sensitive Elements 345 Guilherme Mallmann, Antony D. Burnham, and Raul O.C. Fonseca 18 Titanomagnetite – Silicate Melt Oxybarometry 369 Róbert Arató and Andreas Audétat 19 The Redox Behavior of Rare Earth Elements 381 Maria Rita Cicconi, Charles Le Losq, Grant S. Henderson, and Daniel R. Neuville Index 399
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.
