Water‐Induced Diamond Formation at Earth's Core‐Mantle Boundary

Ko, Byeongkwan; Chariton, Stella; Prakapenka, Vitali; Chen, Bin; Garnero, Edward J.; Li, Mingming; Shim, Sang‐Heon

doi:10.1029/2022GL098271

Title: Water‐Induced Diamond Formation at Earth's Core‐Mantle Boundary

Journal Article · 17 August 2022 · Geophysical Research Letters

DOI: https://doi.org/10.1029/2022GL098271 · OSTI ID:1882242

^[1]; Chariton, Stella ^[2];

^[2];

^[3];

^[4];

^[4]

School of Earth and Space Exploration Arizona State University Tempe AZ USA, Now at Department of Earth and Environmental Sciences Michigan State University East Lansing MI USA
Center for Advanced Radiation Sources University of Chicago Chicago IL USA
Hawaii Institute of Geophysics and Planetology University of Hawaii at Manoa Honolulu HI USA
School of Earth and Space Exploration Arizona State University Tempe AZ USA

Abstract The carbon and water cycles in the Earth's interior are linked to key planetary processes, such as mantle melting, degassing, chemical differentiation, and advection. However, the role of water in the carbon exchange between the mantle and core is not well known. Here, we show experimental results of a reaction between Fe ₃ C and H ₂ O at pressures and temperatures of the deep mantle and core‐mantle boundary (CMB). The reaction produces diamond, FeO, and FeH _x , suggesting that water can liberate carbon from the core in the form of diamond (“core carbon extraction”) while the core gains hydrogen, if subducted water reaches to the CMB. Therefore, Earth's deep water and carbon cycles can be linked. The extracted core carbon can explain a significant amount of the present‐day mantle carbon. Also, if diamond can be collected by mantle flow in the region, it can result in unusually high seismic‐velocity structures.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-06CH11357; FG02-94ER14466

OSTI ID:: 1882242

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 16 Vol. 49; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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