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Title: High-pressure orthorhombic ferromagnesite as a potential deep-mantle carbon carrier

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep07640· OSTI ID:1168511
 [1];  [2];  [3]
  1. The Univ. of Texas at Austin, Austin, TX (United States)
  2. The Univ. of Texas at Austin, Austin, TX (United States); Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (People's Republic of China)
  3. The Univ. of Chicago, Chicago, IL (United States)

In this study, knowledge of the physical and chemical properties of candidate deep-carbon carriers such as ferromagnesite [(Mg,Fe)CO3] at high pressure and temperature of the deep mantle is necessary for our understanding of deep-carbon storage as well as the global carbon cycle of the planet. Previous studies have reported very different scenarios for the (Mg,Fe)CO3 system at deep-mantle conditions including the chemical dissociation to (Mg,Fe)O+CO2, the occurrence of the tetrahedrally-coordinated carbonates based on CO4 structural units, and various high-pressure phase transitions. Here we have studied the phase stability and compressional behavior of (Mg,Fe)CO3 carbonates up to relevant lower-mantle conditions of approximately 120 GPa and 2400 K. Our experimental results show that the rhombohedral siderite (Phase I) transforms to an orthorhombic phase (Phase II with Pmm2 space group) at approximately 50 GPa and 1400 K. The structural transition is likely driven by the spin transition of iron accompanied by a volume collapse in the Fe-rich (Mg,Fe)CO3 phases; the spin transition stabilizes the high-pressure phase II at much lower pressure conditions than its Mg-rich counterpart. It is conceivable that the low-spin ferromagnesite phase II becomes a major deep-carbon carrier at the deeper parts of the lower mantle below 1900 km in depth.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1168511
Journal Information:
Scientific Reports, Vol. 5; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 74 works
Citation information provided by
Web of Science

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Cited By (19)

Single crystal growth, crystalline structure investigation and high-pressure behavior of impurity-free siderite (FeCO3) journal March 2018
Thermal Conductivity Anomaly in (Fe 0.78 Mg 0.22 )CO 3 Siderite Across Spin Transition of Iron journal February 2019
Stability and nature of the volume collapse of ε-Fe2O3 under extreme conditions journal November 2018
Carbon-bearing silicate melt at deep mantle conditions journal April 2017
Origin of arc magmatic signature: A temperature-dependent process for trace element (re)-mobilization in subduction zones journal May 2019
Diamond formation in the deep lower mantle: a high-pressure reaction of MgCO3 and SiO2 journal January 2017
Expedite random structure searching using objects from Wyckoff positions journal February 2018
Phase Transition and vibration properties of MnCO 3 at high pressure and high-temperature by Raman spectroscopy journal May 2018
CO2-induced destabilization of pyrite-structured FeO2Hx in the lower mantle journal March 2018
Spin crossover and hyperfine interactions of iron in ( Mg , Fe ) CO 3 ferromagnesite journal August 2016
Cooperative phenomena in spin crossover systems journal October 2017
Abnormal Elasticity of Single-Crystal Magnesiosiderite across the Spin Transition in Earth’s Lower Mantle journal January 2017
Stability of iron-bearing carbonates in the deep Earth’s interior text January 2017
Polymerized 4-Fold Coordinated Carbonate Melts in the Deep Mantle text January 2019
Polymerized 4-Fold Coordinated Carbonate Melts in the Deep Mantle journal April 2019
Phase Transition and vibration properties of MnCO3 at high pressure and high-temperature by Raman spectroscopy text January 2018
Stability of iron-bearing carbonates in the deep Earth’s interior journal July 2017
Cooperative Phenomena in Spin Crossover Systems text January 2016
Pressure driven spin transition in siderite and magnesiosiderite single crystals text January 2017

Figures / Tables (5)


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