Carbon isotopic signatures of super-deep diamonds mediated by iron redox chemistry

	Carbon isotopic signatures of super-deep diamonds mediated by iron redox chemistry
	J. Liu; W. Wang; H. Yang; Z. Wu; M.Y. Hu; J. Zhao; W. Bi; E.E. Alp; N. Dauphas; W. Liang; B. Chen; J.-F. Lin
	2019
发表期刊	Geochemical Perspectives Letters
卷号	10 页码:51-55
摘要	Among redox sensitive elements, carbon is particularly important because it may have been a driver rather than a passive recorder of Earth’s redox evolution. The extent to which the isotopic composition of carbon records the redox processes that shaped the Earth is still debated. In particular, the highly reduced deep mantle may be metal-saturated, however, it is still unclear how the presence of metallic phases influences the carbon isotopic compositions of super-deep diamonds. Here we report ab initio results for the vibrational properties of carbon in carbonates, diamond, and Fe3C under pressure and temperature conditions relevant to super-deep diamond formation. Previous work on this question neglected the effect of pressure on the equilibrium carbon isotopic fractionation between diamond and Fe3C but our calculations show that this assumption overestimates the fractionation by a factor of ~1.3. Our calculated probability density functions for the carbon isotopic compositions of super-deep diamonds derived from metallic melt can readily explain the very light carbon isotopic compositions observed in some super-deep diamonds. Our results therefore support the view that metallic phases are present during the formation of super-deep diamonds in the mantle below ~250 km.
关键词	Carbon Isotope super-deep Diamonds fe-c Melt
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/42920512-1/10945
专题	地球内部物质高温高压实验室
作者单位	1.Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas 78712, USA 2.Laboratory of Seismology and Physics of Earth’s Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China 3.Center for High Pressure Science and Technology Advanced Research (HPSTAR), Pudong, Shanghai 201203, China 4.CAS Center for Excellence in Comparative Planetology, China 5.Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA 6.Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA 7.Origins Laboratory, Department of the Geophysical Sciences and Enrico Fermi Institute, The University of Chicago, 5734 South Ellis Avenue, Chicago, Illinois 60637, USA 8.Key Laboratory for High Temperature and High Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002, China 9.Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, Honolulu, HI 96822, USA
推荐引用方式 GB/T 7714	J. Liu；W. Wang；H. Yang；Z. Wu；M.Y. Hu；J. Zhao；W. Bi；E.E. Alp；N. Dauphas；W. Liang；B. Chen；J.-F. Lin. Carbon isotopic signatures of super-deep diamonds mediated by iron redox chemistry[J]. Geochemical Perspectives Letters,2019,10:51-55.
APA	J. Liu；W. Wang；H. Yang；Z. Wu；M.Y. Hu；J. Zhao；W. Bi；E.E. Alp；N. Dauphas；W. Liang；B. Chen；J.-F. Lin.(2019).Carbon isotopic signatures of super-deep diamonds mediated by iron redox chemistry.Geochemical Perspectives Letters,10,51-55.
MLA	J. Liu；W. Wang；H. Yang；Z. Wu；M.Y. Hu；J. Zhao；W. Bi；E.E. Alp；N. Dauphas；W. Liang；B. Chen；J.-F. Lin."Carbon isotopic signatures of super-deep diamonds mediated by iron redox chemistry".Geochemical Perspectives Letters 10(2019):51-55.

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