V049
The Influence of Oxygen Fugacity on Geochemical Processes

Session ID#: 76531

Session Description:
Oxygen fugacity (fO2) is an intensive variable that controls the geochemical behavior of redox sensitive elements such as C, S, Fe, Cr, Mo and V.  Notably, the modern Earth shows a large range in fO2, varying from a highly reduced metallic core to an atmosphere containing free molecular O2.  Constraining the fO2 of various terrestrial geochemical reservoirs is critical to understand redox reactions and redox-dependent volatile speciation in such diverse processes as core formation, mantle melting, atmospheric evolution and the origin of life.  This includes, but is not limited to, the influence of fO2 on exchange between the deep Earth and surficial environments, such as magmatic degassing and subduction related recycling.  This session is open to all submissions examining the influence of fO2 on geochemical processes, whether modern or ancient, shallow or deep.  We particularly encourage interdisciplinary submissions working at the intersection of high and low-temperature geochemistry.
Index Terms:

0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
1025 Composition of the mantle [GEOCHEMISTRY]
1030 Geochemical cycles [GEOCHEMISTRY]
1038 Mantle processes [GEOCHEMISTRY]

Primary Convener:  Robert William Nicklas, University of Maryland College Park, Department of Geology, College Park, MD, United States
Conveners:  Maryjo N Brounce, University of California Riverside, Earth Sciences, Riverside, CA, United States; California Institute of Technology, Pasadena, CA, United States and Sonja Aulbach, Johann W Goethe-Universitaet, Frankfurt, Germany
Primary Liaison:  Robert William Nicklas, University of Maryland College Park, Department of Geology, College Park, MD, United States
 
Mantle oxidation driven by variable sulfur release during subduction (Invited) (499703)
Alicia M Cruz-Uribe1, Jesse Walters1 and Horst Marschall2, (1)University of Maine, Orono, ME, United States, (2)Goethe University Frankfurt, Institut für Geowissenschaften, Frankfurt, Germany
 
Thermodynamic and Geochemical Heterogeneity within Mid-Ocean Ridge Peridotites (500330)
Suzanne Katherine Birner, Berea College, Berea, KY, United States, Elizabeth Cottrell, Smithsonian, NMNH, Washington, DC, United States, Fred A Davis, University of Minnesota Duluth, Duluth, MN, United States, Jessica M Warren, Stanford University, Stanford, CA, United States, Katherine A Kelley, University of Rhode Island, Narragansett, RI, United States and Meena Said, Notre Dame, Notre Dame, IN, United States
 
Pressure effect on the oxidation state of a terrestrial magma ocean, from experimental perspective (512505)
Hongluo Zhang, China University of Geosciences (Beijing), Beijing, China, Marc M Hirschmann, University of Minnesota Twin Cities, Department of Earth Sciences, Minneapolis, MN, United States, Michael J Walter, Carnegie Institution for Science, Geophysical Laboratory, Washington, DC, United States, Oliver T Lord, University of Bristol, School of Earth Sciences, Bristol, United Kingdom, Elizabeth Cottrell, Smithsonian, NMNH, Washington, DC, United States, Sally June Tracy, California Institute of Technology, Pasadena, CA, United States and Avishek Rudra, University of Minnesota Twin Cities, Minneapolis, MN, United States
 
Using Coexisting Olivine-Melt Pairs to Evaluate Equilibrium at Known Temperature and Oxygen Fugacity (517848)
Kenneth James Peterman and Michael Barton, Ohio State University Main Campus, Columbus, OH, United States
 
Drawing connections between slab-derived sulfur, mantle melting, and arc magma oxidation state: A case study in the southern Cascades (546834)
Michelle Muth1, Paul J Wallace1 and Glenn A Gaetani2, (1)University of Oregon, Eugene, OR, United States, (2)WHOI, Geology & Geophysics, Woods Hole, MA, United States
 
Partial melting of peridotite at 1 atm. and 1.5 GPa and varying oxygen fugacities (552808)
Fred A Davis, University of Minnesota Duluth, Duluth, MN, United States and Elizabeth Cottrell, Smithsonian, NMNH, Washington, DC, United States
 
A New High-Pressure Experimental Apparatus to Study Magmatic Processes at Precisely Controlled Redox Conditions (564028)
Alice Alex, University of Toronto, Toronto, ON, Canada and Zoltan Zajacz, University of Toronto, Department of Earth Sciences, Toronto, ON, Canada
 
Application of a New Eu-in-Plagioclase-Melt Oxybarometer to MORBs and Arc Magmas (596671)
Nicholas J Dygert, University of Tennessee, Knoxville, TN, United States and Molly C McCanta, Tufts University, Medford, MA, United States
 
Experimental Determination of Ferric Iron Partitioning between Pyroxene and Melt During Partial Melting of the Earth’s Upper Mantle (599088)
Avishek Rudra, University of Minnesota Twin Cities, Minneapolis, MN, United States and Marc M Hirschmann, University of Minnesota Twin Cities, Department of Earth Sciences, Minneapolis, MN, United States
 
Pyroxene Fe-Oxybarometry: Revisiting Old Data with New Analytical Tools and Calibrations (605011)
Molly C McCanta, University of Tennessee, Knoxville, TN, United States and Melinda Darby Dyar, Mount Holyoke College, South Hadley, MA, United States
 
Tracking the accumulation of O2 in Archean oceans using thallium and molybdenum isotopes (Invited) (620909)
Chadlin M Ostrander1, Jeremy D Owens2, Sune Nielsen3 and Ariel D Anbar1, (1)Arizona State University, School of Earth and Space Exploration, Tempe, AZ, United States, (2)Florida State University, Earth, Ocean and Atmospheric Science, Tallahassee, FL, United States, (3)Woods Hole Oceanographic Institute, Woods Hole, MA, United States
 
Genesis of oxidized and reduced granitoids in the Peninsular Ranges batholith of Southern and Baja California (625516)
Mia Flores1, Marty Grove1 and David L Kimbrough2, (1)Stanford University, Geological Sciences, Stanford, CA, United States, (2)San Diego State University, Geological Sciences, San Diego, CA, United States
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