V042
Redox variables and mechanisms in magmatism and volcanism

Session ID#: 82211

Session Description:
Redox is one of the keys for understanding Earth oxygenation, magmatism and volcanism, from magma-genesis, through crystallization to volcanic degassing. Furthermore, redox plays a fundamental role for material processes: its understanding allows bridging important gaps between material and Earth sciences. The objective of the session is to promote the links between atomic-scale structures, macroscopic properties, and igneous processes occurring on Earth.

We strongly encourage the submission of contributions about the role of redox on:

-i) melt/glass thermodynamics with emphasis on mixing properties (including first principles approaches)

-ii) spectroscopic evidence for short-medium range structure

-iii) role of cationic and anionic interactions on transport properties

-iv) volatile solubility and diffusivity

-v) speciation behavior, with emphasis on volatiles and trace elements

-vi) glass transition and rheology of magmas

-vii) experimental and computational determination of phase diagrams, particularly in volatile-bearing systems

-viii) reconstruction of igneous processes from bactracking of redox data in natural samples

Index Terms:

3619 Magma genesis and partial melting [MINERALOGY AND PETROLOGY]
3630 Experimental mineralogy and petrology [MINERALOGY AND PETROLOGY]
8430 Volcanic gases [VOLCANOLOGY]
8439 Physics and chemistry of magma bodies [VOLCANOLOGY]


Primary Convener:  Roberto Moretti, Université de Paris, Institut de Physique du Globe de Paris - OVSG, Gourbeyre, Guadeloupe
Convener:  Daniel R Neuville, CNRS-IPGP, Paris, France
Primary Liaison:  Roberto Moretti, Université de Paris, Institut de Physique du Globe de Paris - OVSG, Gourbeyre, Guadeloupe
 
Iron speciation and magma redox state: in situ Fe K-edge XANES dynamic study of the Erebus (Antarctica) phonolite (560907)
Charles Le Losq1,2, Roberto Moretti3, Clive Oppenheimer4 and Daniel R Neuville1, (1)Institut de Physique du Globe de Paris, Paris, France, (2)Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, (3)Université de Paris, Institut de Physique du Globe de Paris - OVSG, Gourbeyre, Guadeloupe, (4)University of Cambridge, Department of Geography, Cambridge, United Kingdom
 
Influence of iron redox on viscosity of silicate melts (576516)
Daniel R Neuville, Institut de Physique du Globe de Paris, Paris, France
 
Fe3+/FeT ratios in volcanic amphiboles determined by single-crystal synchrotron Mössbauer spectroscopy as a function of mineral composition, magmatic oxygen fugacity and post-crystallization processes. (592298)
Barbara Cäcilia Ratschbacher1, Claire E Bucholz1, Jennifer M Jackson2 and Natalia V Solomatova1,3, (1)California Institute of Technology, Pasadena, CA, United States, (2)California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, (3)École Normale Supérieure Lyon, Laboratoire de Géologie, Lyon, France
 
Pathways of oxidation state and sulfur release and the shift from low-energy to highly explosive basaltic eruptions at Mt. Etna volcano (Sicily, Italy) (603680)
Roberto Moretti, Université de Paris, Institut de Physique du Globe de Paris - OVSG, Gourbeyre, Guadeloupe, Nicole Metrich, Institut de Physique du Globe, Paris Cedex 05, France, Valeria Di Renzo, ARPA Campania, Naples, Italy, Patrick Allard, CNRS, Paris 05, France and Alessandro Aiuppa, Università di Palermo, Dipartimento di Scienze della Terra e del Mare (DiSTeM), Palermo, Italy
 
Experimental constraints on sulphur solubility and speciation in primitive arc magmas (612804)
Patrick Beaudry, Massachusetts Institute of Technology, Cambridge, MA, United States and Timothy L Grove, Massachusetts Institute of Technology, Earth, Atmospheric & Planetary Sciences, Cambridge, MA, United States