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000418155 1001_ $$00000-0002-5781-5716$$aKiseeva, Ekaterina S.$$b0$$eCorresponding author
000418155 245__ $$aOxidized iron in garnets from the mantle transition zone
000418155 260__ $$aLondon$$bNature Publ. Group$$c2018
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000418155 520__ $$aThe oxidation state of iron in Earth’s mantle is well known to depths of approximately 200 km, but has not been characterized in samples from the lowermost upper mantle (200–410 km depth) or the transition zone (410–660 km depth). Natural samples from the deep (>200 km) mantle are extremely rare, and are usually only found as inclusions in diamonds. Here we use synchrotron Mössbauer source spectroscopy complemented by single-crystal X-ray diffraction to measure the oxidation state of Fe in inclusions of ultra-high pressure majoritic garnet in diamond. The garnets show a pronounced increase in oxidation state with depth, with Fe$^{3+}$/(Fe$^{3+}$+ Fe$^{2+}$) increasing from 0.08 at approximately 240 km depth to 0.30 at approximately 500 km depth. The latter majorites, which come from pyroxenitic bulk compositions, are twice as rich in Fe$^{3+}$ as the most oxidized garnets from the shallow mantle. Corresponding oxygen fugacities are above the upper stability limit of Fe metal. This implies that the increase in oxidation state is unconnected to disproportionation of Fe$^{2+}$ to Fe$^{3+}$ plus Fe$^0$. Instead, the Fe$^{3+}$ increase with depth is consistent with the hypothesis that carbonated fluids or melts are the oxidizing agents responsible for the high Fe$^{3+}$ contents of the inclusions.
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000418155 7001_ $$aVasiukov, Denis M.$$b1
000418155 7001_ $$aWood, Bernard J.$$b2
000418155 7001_ $$0P:(DE-H253)PIP1081721$$aMcCammon, Catherine$$b3
000418155 7001_ $$aStachel, Thomas$$b4
000418155 7001_ $$0P:(DE-H253)PIP1014098$$aBykov, Maxim$$b5
000418155 7001_ $$0P:(DE-H253)PIP1015382$$aBykova, Elena$$b6
000418155 7001_ $$aChumakov, Aleksandr$$b7
000418155 7001_ $$aCerantola, Valerio$$b8
000418155 7001_ $$aHarris, Jeff W.$$b9
000418155 7001_ $$0P:(DE-H253)PIP1014493$$aDubrovinsky, Leonid$$b10
000418155 773__ $$0PERI:(DE-600)2396648-8$$a10.1038/s41561-017-0055-7$$gVol. 11, no. 2, p. 144 - 147$$n2$$p144 - 147$$tNature geoscience$$v11$$x1752-0908$$y2018
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