TY - JOUR
T1 - Water-Induced Diamond Formation at Earth's Core-Mantle Boundary
AU - Ko, Byeongkwan
AU - Chariton, Stella
AU - Prakapenka, Vitali
AU - Chen, Bin
AU - Garnero, Edward J.
AU - Li, Mingming
AU - Shim, Sang Heon
N1 - Publisher Copyright:
© 2022. American Geophysical Union. All Rights Reserved.
PY - 2022/8/28
Y1 - 2022/8/28
N2 - 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 Fe3C and H2O at pressures and temperatures of the deep mantle and core-mantle boundary (CMB). The reaction produces diamond, FeO, and FeHx, 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.
AB - 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 Fe3C and H2O at pressures and temperatures of the deep mantle and core-mantle boundary (CMB). The reaction produces diamond, FeO, and FeHx, 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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U2 - 10.1029/2022GL098271
DO - 10.1029/2022GL098271
M3 - Article
AN - SCOPUS:85137779576
SN - 0094-8276
VL - 49
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 16
M1 - e2022GL098271
ER -