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| 1 | CO2-induced destabilization of pyrite-structured FeO2Hx in the lower mantle显示文摘Volatiles, such as carbon and water, modulate the Earth's mantle rheology, partial melting and redox state,thereby playing a crucial role in the Earth's internal dynamics. We experimentally show the transformation of goethite FeOOH in the presence of CO_2 into a tetrahedral carbonate phase, Fe_4C_3O_(12), at conditions above 107 GPa—2300 K. At temperatures below 2300 K, no interactions are evidenced between goethite and CO_2, and instead a pyrite-structured FeO_2 Hx is formed as recently reported by Hu et al.(2016; 2017)and Nishi et al.(2017). The interpretation is that, above a critical temperature, FeO_2 Hx reacts with CO_2 and H_2, yielding Fe_4C_3O_(12) and H_2 O. Our findings provide strong support for the stability of carbon-oxygen-bearing phases at lower-mantle conditions. In both subducting slabs and lower-mantle lithologies, the tetrahedral carbonate Fe_4C_3O_(12) would replace the pyrite-structured FeO_2 Hx through carbonation of these phases. This reaction provides a new mechanism for hydrogen release as H2 O within the deep lower mantle. Our study shows that the deep carbon and hydrogen cycles may be more complex than previously thought, as they strongly depend on the control exerted by local mineralogical and chemical environments on the CO_2 and H_2 thermodynamic activities. | Eglantine Boulard Francois Guyot Nicolas Menguy Alexandre Corgne Anne-Line Auzende Jean-Philippe Perrillat Guillaume Fiquet | 2018 | National Science Review2018，5，6： | 2 |
| 2 | Synthesis of superhard cubic BC2N 显示文摘 | Solozhenko V L Andrauh D Fiquet G | 2001 | Applied Physics Letters2001，78，10： | 1 |
| 3 | p-V-T equation of state of MgSiO3 perovskite 显示文摘 | FIQUET G ANDRAULT D DEWAELE A | 1998 | Phys Earth Planet Inter1998，105，： | 1 |
| 4 | Effect of Si on liquid Fe compressibility:implications for sound velocity in core materials显示文摘 | SANLOUP C FIQUET G GREGORYANZ E | 2004 | Geophys Res Lett2004，31，07： | 1 |
| 5 | Structure analysis and stability field of beta-iron at high P and T 显示文摘 | Andrault D Fiquet G Charpin T | 2000 | American Mineralogist2000，85，： | 1 |
| 6 | Synthesis of superhard cubic BC2N 显示文摘 | Solozhenko V L Andrault D Fiquet G | 2001 | Appl Phys Lett2001，78，： | 1 |
| 7 | Thermoelastic properties and crystal structure of MgSiO3 perovskite at lower mantle pressure and temperature conditions显示文摘 | FIQUET G DEWAELE A ANDRAULT D | 2000 | Geophysical Research Letters2000，27，1： | 1 |
| 8 | How are patients with type 2 diabetes and renal disease monitored and managed? Insights from the observational OREDIA study 显示文摘 | Penfornis A Blickle JF Fiquet B | 2014 | Vase Health Risk Manag2014，10，： | 1 |
| 9 | High-temperature Thermal Expansion of Lime, Periclase, Corundum, and Spinel 显示文摘 | Fiquet G Richet P Montagnac G | 1999 | Physical Chem Minerals1999，27，： | 1 |
| 10 | Iron partitioning in earth's mantle:toward a deep lower mantle discontinuity显示文摘 | Badro J Fiquet G Guyot F | 2003 | Science2003，300，： | 1 |
| 11 | Combined in situ X-ray diffraction and Raman spectroscopy on majoritic garnet inclusions in diamonds显示文摘 | Philippe Gillet Guilllaume Fiquet | 2002 | Earth and Planetary Science Letters2002，，198： | 1 |
| 12 | Mineral phases of the earth's mantle显示文摘 | FIQUET G | 2001 | Zeitschrift Fiir Kristallographie2001，216，： | 1 |
| 13 | P-VT equation of state of MgSiO3 perovskite显示文摘 | FIQUET G ANDRAULT D DEWAELE A | 1998 | Physics of the Earth and Planetary Interiors1998，105，： | 1 |
| 14 | Combined in situ X-ray diffraction and Raman spectroscopy on majoritic garnet inclusions in diamonds显示文摘 | KUNZ M GILLET P FIQUET G | 2002 | Earth and Planetary Science Letters2002，198，： | 1 |
| 15 | 显示文摘 | Solozhenko V L Andrault D Fiquet G | 2001 | Appl Phys Lett2001，78，10： | 1 |
| 16 | p-V-T equation of state of periclase from synchrotron radiation measurements 显示文摘 | DEWAELE A G FIQUET G ANDRAULT D | 2000 | J Geophys Res2000，105，： | 1 |
| 17 | X-ray diffraction of periclase in a laser heated diamond-anvil cell显示文摘 | FIQUET G ANDRAULT D ITI J P | 1996 | Phys Earth Planet Inter1996，95，： | 1 |
| 18 | High-temperature thermal expansion of lime, periclase, corundum and spinel显示文摘 | Fiquet G Richet P Montagnac G | 1999 | Phys Chem Miner1999，27，： | 1 |
| 19 | Powder X-ray diffraction under extreme conditions of pressure and temperature 显示文摘 | FIQUET G ANDRAULT D | 1999 | J Synchrotron Rad1999，6，： | 1 |
| 20 | 显示文摘 | Solozhenko V L Andrault D Fiquet G | 2001 | Appl Phys Lett2001，78，： | 1 |
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