New High-Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep-Mantle Carbon Transportation
Abstract
In this study, we have investigated the stability of CaCO3 at high pressures and temperatures using synchrotron X-ray diffraction in laser-heated diamond anvil cells. Our experimental results have shown that CaCO3 in the aragonite structure transforms into CaCO3-VII (P21/c) at 27 GPa and 1,500 K with a negative Clapeyron slope of –4.3(9) MPa/K. CaCO3-VII is stable between 23 and 38 GPa at 2,300 K and transforms into post-aragonite at 42 GPa and 1,400 K. Furthermore, it reacts with stishovite, an abundant form of SiO2 in subducted oceanic crust, forming CaSiO3-perovskite. The occurrence of CaSiO3-perovskite via the reaction of CaCO3-VII and stishovite provides an explanation for the observation of the high concentrations of CaSiO3-perovskite and some amount of CaCO3 in deep-mantle inclusions. We conclude, CaCO3-VII is thus an important carbon-bearing phase at the topmost lower mantle and may provide necessary carbon to produce deep-mantle diamonds.
- Authors:
-
[1];
[3];
[1];
[4];
[1]
- Univ. of Science and Technology of China, Hefei (China)
- Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
- Univ. of Texas, Austin, TX (United States)
- Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- Chinese Academy of Sciences (CAS); China National Science Foundation; National Basic Research Program of China; National Natural Science Foundation of China (NSFC); The Sloan Foundation; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
- OSTI Identifier:
- 1424762
- Grant/Contract Number:
- XDB18000000; 41522403; 2014CB845904; 41020134003; EAR-1128799; FG02-94ER14466; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 45; Journal Issue: 3; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 58 GEOSCIENCES; CaCO3‐VII; CaCO3‐SiO2 reaction; topmost lower mantle; high pressure‐temperature; carbon transportation
Citation Formats
Li, Xinyang, Zhang, Zhigang, Lin, Jung-Fu, Ni, Huaiwei, Prakapenka, Vitali B., and Mao, Zhu. New High-Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep-Mantle Carbon Transportation. United States: N. p., 2018.
Web. doi:10.1002/2017GL076536.
Li, Xinyang, Zhang, Zhigang, Lin, Jung-Fu, Ni, Huaiwei, Prakapenka, Vitali B., & Mao, Zhu. New High-Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep-Mantle Carbon Transportation. United States. https://doi.org/10.1002/2017GL076536
Li, Xinyang, Zhang, Zhigang, Lin, Jung-Fu, Ni, Huaiwei, Prakapenka, Vitali B., and Mao, Zhu. Fri .
"New High-Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep-Mantle Carbon Transportation". United States. https://doi.org/10.1002/2017GL076536. https://www.osti.gov/servlets/purl/1424762.
@article{osti_1424762,
title = {New High-Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep-Mantle Carbon Transportation},
author = {Li, Xinyang and Zhang, Zhigang and Lin, Jung-Fu and Ni, Huaiwei and Prakapenka, Vitali B. and Mao, Zhu},
abstractNote = {In this study, we have investigated the stability of CaCO3 at high pressures and temperatures using synchrotron X-ray diffraction in laser-heated diamond anvil cells. Our experimental results have shown that CaCO3 in the aragonite structure transforms into CaCO3-VII (P21/c) at 27 GPa and 1,500 K with a negative Clapeyron slope of –4.3(9) MPa/K. CaCO3-VII is stable between 23 and 38 GPa at 2,300 K and transforms into post-aragonite at 42 GPa and 1,400 K. Furthermore, it reacts with stishovite, an abundant form of SiO2 in subducted oceanic crust, forming CaSiO3-perovskite. The occurrence of CaSiO3-perovskite via the reaction of CaCO3-VII and stishovite provides an explanation for the observation of the high concentrations of CaSiO3-perovskite and some amount of CaCO3 in deep-mantle inclusions. We conclude, CaCO3-VII is thus an important carbon-bearing phase at the topmost lower mantle and may provide necessary carbon to produce deep-mantle diamonds.},
doi = {10.1002/2017GL076536},
journal = {Geophysical Research Letters},
number = 3,
volume = 45,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2018},
month = {Fri Feb 02 00:00:00 EST 2018}
}
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Works referencing / citing this record:
Stability and Reactions of CaCO 3 Polymorphs in the Earth's Deep Mantle
journal, August 2018
- Zhang, Zhigang; Mao, Zhu; Liu, Xi
- Journal of Geophysical Research: Solid Earth