期刊
SCIENCE
卷 325, 期 5940, 页码 605-607出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1174156
关键词
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资金
- Smithsonian
- NSF [EAR-0841108, EAR-0841006, OCE-0644625]
- U.S. Department of Energy Geosciences Division [DE-FG02-92ER14244]
- University of Chicago Consortium for Advanced Radiation Sources
- DOE [DE-AC02-98CH10886]
- Directorate For Geosciences
- Division Of Earth Sciences [0841108] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [0841006] Funding Source: National Science Foundation
Mantle oxygen fugacity exerts a primary control on mass exchange between Earth's surface and interior at subduction zones, but the major factors controlling mantle oxygen fugacity (such as volatiles and phase assemblages) and how tectonic cycles drive its secular evolution are still debated. We present integrated measurements of redox-sensitive ratios of oxidized iron to total iron (Fe3+/SFe), determined with Fe K-edge micro-x-ray absorption near-edge structure spectroscopy, and pre-eruptive magmatic H2O contents of a global sampling of primitive undegassed basaltic glasses and melt inclusions covering a range of plate tectonic settings. Magmatic Fe3+/SFe ratios increase toward subduction zones (at ridges, 0.13 to 0.17; at back arcs, 0.15 to 0.19; and at arcs, 0.18 to 0.32) and correlate linearly with H2O content and element tracers of slab-derived fluids. These observations indicate a direct link between mass transfer from the subducted plate and oxidation of the mantle wedge.
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