Carbonate stability in the reduced lower mantle
Journal Article
·
· Earth and Planetary Science Letters
- Ecole Polytechnique Federale Lausanne (Switzlerland); Michigan State Univ., East Lansing, MI (United States); Michigan State University
- 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)
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.
- Research Organization:
- GeoSoilEnviroCARS, University of Chicago
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
- Grant/Contract Number:
- FG02-94ER14466
- OSTI ID:
- 1426861
- Alternate ID(s):
- OSTI ID: 1701913
OSTI ID: 1426280
- Journal Information:
- Earth and Planetary Science Letters, Journal Name: Earth and Planetary Science Letters Journal Issue: C Vol. 489; ISSN 0012-821X
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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