Journal
AMERICAN MINERALOGIST
Volume 101, Issue 12, Pages 2723-2730Publisher
MINERALOGICAL SOC AMER
DOI: 10.2138/am-2016-5742
Keywords
Carbonate; X-ray diffraction; raman spectroscopy; high pressure
Categories
Funding
- Geophysics Program at NSF [EAR 1446969]
- Deep Carbon Observatory
- eDARI [stl2816]
- PICS program of CNRS
- National Natural Science Foundation of China [41374107]
- Youth Innovative Technology Talents Program of Institute of Geochemistry, Chinese Academy of Sciences
- COMPRES under NSF [EAR 11-57758]
- GSECARS through NSF [EAR-1128799]
- DOE [DE-FG02-94ER14466]
- DOE-NNSA [DE-NA0001974]
- DOE-BES [DE-FG02-99ER45775]
- NSF
- DOE Office of Science [DE-AC02-06CH11357]
- Directorate For Geosciences
- Division Of Earth Sciences [1055454] Funding Source: National Science Foundation
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Knowledge of potential carbon carriers such as carbonates is critical for our understanding of the deep-carbon cycle and related geological processes within the planet. Here we investigated the high-pressure behavior of (Ca,Mn)CO3 up to 75 GPa by synchrotron single-crystal X-ray diffraction, laser Raman spectroscopy, and theoretical calculations. MnCO3-rich carbonate underwent a structural phase transition from the CaCO3-I structure into the CaCO3-VI structure at 45-48 GPa, while CaCO3-rich carbonate transformed into CaCO3-III and CaCO3-VI at approximately 2 and 15 GPa, respectively. The equation of state and vibrational properties of MnCO3-rich and CaCO3-rich carbonates changed dramatically across the phase transition. The CaCO3-VI-structured CaCO3-rich and MnCO3-rich carbonates were stable at room temperature up to at least 53 and 75 GPa, respectively. The addition of smaller cations (e.g., Mn2+, Mg2+, and Fe2+) can enlarge the stability field of the CaCO3-I phase as well as increase the pressure of the structural transition into the CaCO3-VI phase.
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