Carbonate stability in the reduced lower mantle

doi:10.1016/j.epsl.2018.02.035

Title: Carbonate stability in the reduced lower mantle

Abstract

Carbonate minerals are important hosts of carbon in the crust and mantle with a key role in the transport and storage of carbon in Earth’s deep interior over the history of the planet. Whether subducted carbonates efficiently melt and break down due to interactions with reduced phases or are preserved to great depths and ultimately reach the core-mantle boundary remains controversial. In this study, experiments in the laser-heated diamond anvil cell (LHDAC) on layered samples of dolomite (Mg,Ca)CO3 and iron at pressure and temperature conditions reaching those of the deep lower mantle show that carbon-iron redox interactions destabilize the MgCO3 component, producing a mixture of diamond, Fe7C3, and (Mg,Fe)O. However, CaCO3 is preserved, supporting its relative stability in carbonate-rich lithologies under reducing lower mantle conditions. These results constrain the thermodynamic stability of redox-driven breakdown of carbonates and demonstrate progress towards multiphase mantle petrology in the LHDAC at conditions of the lowermost mantle.

Authors:

^[1]; Badro, James ^[2]; Nabiei, Farhang ^[3]; Prakapenka, Vitali B. ^[4]; Cantoni, Marco ^[3]; Gillet, Philippe ^[3]

Ecole Polytechnique Federale Lausanne (Switzlerland); Michigan State Univ., East Lansing, MI (United States)
Ecole Polytechnique Federale Lausanne (Switzlerland); Sorbonne Paris Cite (France)
Ecole Polytechnique Federale Lausanne (Switzlerland)
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)

Publication Date:: 2018-05-01

Research Org.:: GeoSoilEnviroCARS, University of Chicago

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; USDOE

OSTI Identifier:: 1426861

Alternate Identifier(s):: OSTI ID: 1701913

Grant/Contract Number:: FG02-94ER14466

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: Earth and Planetary Science Letters

Additional Journal Information:: Journal Volume: 489; Journal Issue: C; Journal ID: ISSN 0012-821X

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES

Citation Formats


                    Dorfman, Susannah M., Badro, James, Nabiei, Farhang, Prakapenka, Vitali B., Cantoni, Marco, and Gillet, Philippe. Carbonate stability in the reduced lower mantle.  United States: N. p., 2018. 
        Web.  doi:10.1016/j.epsl.2018.02.035.

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                    Dorfman, Susannah M., Badro, James, Nabiei, Farhang, Prakapenka, Vitali B., Cantoni, Marco, & Gillet, Philippe. Carbonate stability in the reduced lower mantle.  United States.  doi:10.1016/j.epsl.2018.02.035.

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                    Dorfman, Susannah M., Badro, James, Nabiei, Farhang, Prakapenka, Vitali B., Cantoni, Marco, and Gillet, Philippe. Tue .  
        "Carbonate stability in the reduced lower mantle".  United States.  doi:10.1016/j.epsl.2018.02.035.  https://www.osti.gov/servlets/purl/1426861.

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@article{osti_1426861,

  title        = {Carbonate stability in the reduced lower mantle},

  author       = {Dorfman, Susannah M. and Badro, James and Nabiei, Farhang and Prakapenka, Vitali B. and Cantoni, Marco and Gillet, Philippe},

  abstractNote = {Carbonate minerals are important hosts of carbon in the crust and mantle with a key role in the transport and storage of carbon in Earth’s deep interior over the history of the planet. Whether subducted carbonates efficiently melt and break down due to interactions with reduced phases or are preserved to great depths and ultimately reach the core-mantle boundary remains controversial. In this study, experiments in the laser-heated diamond anvil cell (LHDAC) on layered samples of dolomite (Mg,Ca)CO3 and iron at pressure and temperature conditions reaching those of the deep lower mantle show that carbon-iron redox interactions destabilize the MgCO3 component, producing a mixture of diamond, Fe7C3, and (Mg,Fe)O. However, CaCO3 is preserved, supporting its relative stability in carbonate-rich lithologies under reducing lower mantle conditions. These results constrain the thermodynamic stability of redox-driven breakdown of carbonates and demonstrate progress towards multiphase mantle petrology in the LHDAC at conditions of the lowermost mantle.},

  doi          = {10.1016/j.epsl.2018.02.035},

  journal      = {Earth and Planetary Science Letters},

  issn         = {0012-821X},

  number       = C,

  volume       = 489,

  place        = {United States},

  year         = {2018},

  month        = {5}

}

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DOI: 10.1016/j.epsl.2018.02.035

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Works referencing / citing this record:

In-situ High-Temperature XRD and FTIR for Calcite, Dolomite and Magnesite: Anharmonic Contribution to the Thermodynamic Properties
journal, October 2019

Wang, Xiang; Xu, Xiaoxiang; Ye, Yu
Journal of Earth Science, Vol. 30, Issue 5
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Kinetic Control on the Depth Distribution of Superdeep Diamonds
journal, February 2019

Zhu, Feng; Li, Jie; Liu, Jiachao
Geophysical Research Letters, Vol. 46, Issue 4
DOI: 10.1029/2018gl080740

Marine Carbonates in the Mantle Source of Oceanic Basalts: Pb Isotopic Constraints
journal, October 2018

Castillo, P. R.; MacIsaac, C.; Perry, S.
Scientific Reports, Vol. 8, Issue 1
DOI: 10.1038/s41598-018-33178-4

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Title: Carbonate stability in the reduced lower mantle

Abstract

Citation Formats

In-situ High-Temperature XRD and FTIR for Calcite, Dolomite and Magnesite: Anharmonic Contribution to the Thermodynamic Properties journal, October 2019

Kinetic Control on the Depth Distribution of Superdeep Diamonds journal, February 2019

Marine Carbonates in the Mantle Source of Oceanic Basalts: Pb Isotopic Constraints journal, October 2018

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journal, October 2019

Kinetic Control on the Depth Distribution of Superdeep Diamonds
journal, February 2019

Marine Carbonates in the Mantle Source of Oceanic Basalts: Pb Isotopic Constraints
journal, October 2018