globalchange  > 气候减缓与适应
DOI: 10.1038/s41561-017-0055-7
论文题名:
Oxidized iron in garnets from the mantle transition zone
作者: Kiseeva E.S.; Vasiukov D.M.; Wood B.J.; McCammon C.; Stachel T.; Bykov M.; Bykova E.; Chumakov A.; Cerantola V.; Harris J.W.; Dubrovinsky L.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期:2
起始页码: 144
结束页码: 147
语种: 英语
Scopus关键词: diamond ; fugacity ; garnet ; high pressure ; iron ; mantle ; Mossbauer spectroscopy ; oxidation ; transition zone ; upper mantle
英文摘要: The oxidation state of iron in Earth's mantle is well known to depths of approximately 200 km, but has not been characterized in samples from the lowermost upper mantle (200-410 km depth) or the transition zone (410-660 km depth). Natural samples from the deep (>200 km) mantle are extremely rare, and are usually only found as inclusions in diamonds. Here we use synchrotron Mössbauer source spectroscopy complemented by single-crystal X-ray diffraction to measure the oxidation state of Fe in inclusions of ultra-high pressure majoritic garnet in diamond. The garnets show a pronounced increase in oxidation state with depth, with Fe3+/(Fe3++ Fe2+) increasing from 0.08 at approximately 240 km depth to 0.30 at approximately 500 km depth. The latter majorites, which come from pyroxenitic bulk compositions, are twice as rich in Fe3+ as the most oxidized garnets from the shallow mantle. Corresponding oxygen fugacities are above the upper stability limit of Fe metal. This implies that the increase in oxidation state is unconnected to disproportionation of Fe2+ to Fe3+ plus Fe0. Instead, the Fe3+ increase with depth is consistent with the hypothesis that carbonated fluids or melts are the oxidizing agents responsible for the high Fe3+ contents of the inclusions. © 2018 The Author(s).
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被引频次[WOS]:45   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105608
Appears in Collections:气候减缓与适应
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作者单位: Department of Earth Sciences, University of Oxford, Oxford, United Kingdom; Laboratory of Crystallography, University of Bayreuth, Bayreuth, Germany; Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, Germany; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada; DESY Photon Science, Hamburg, Germany; ESRF-The European Synchrotron, Grenoble, France; School of Geographical and Earth Sciences, University of Glasgow, Glasgow, United Kingdom

Recommended Citation:
Kiseeva E.S.,Vasiukov D.M.,Wood B.J.,et al. Oxidized iron in garnets from the mantle transition zone[J]. Nature Geoscience,2018-01-01,11(2)
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