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Title: Pressure-induced phase transition in MnCO3 and its implications on the deep carbon cycle

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1002/2015JB011901· OSTI ID:1354492
 [1];  [2];  [3];  [4]
  1. Stanford Univ., CA (United States); CNRS, Grenoble (France)
  2. Carnegie Inst. of Washington, Washington, DC (United States)
  3. Sorbonne Univ.-UPMC Univ. Paris 6, Paris (France)
  4. Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

The high–pressure behavior of manganese–rich carbonate, rhodochrosite, has been characterized up to 62 GPa by synchrotron–based midinfrared spectroscopy and X–ray diffraction. Modifications in both the infrared spectra and the X–ray diffraction patterns were observed above ~35 GPa, indicating the presence of a high–pressure phase transition at these pressures. We found that rhodochrosite adopts a structure close to CaCO3–VI with a triclinic unit cell (a = 2.87 Å, b = 4.83 Å, c = 5.49 Å, α = 99.86°, β = 94.95°, and γ = 90.95° at 62 GPa). Using first–principles calculations based on density functional theory, we confirmed these observations and assigned modes in the new infrared signature of the high–pressure phase. Furthermore, these results suggest that high–pressure metastable phase of calcite may play an important role in carbon storage and transport in the deep Earth.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); COMPRES, the Consortium for Materials Properties Research in Earth Sciences; National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); GENCI‐IDRIS
Grant/Contract Number:
SC00112704; EAR 11–57758; FC03‐03N00144; AC02‐98CH10886; AC02‐05CH11231; EAR‐1141929; 2014‐i2014041519
OSTI ID:
1354492
Report Number(s):
BNL-113009-2016-JA
Journal Information:
Journal of Geophysical Research. Solid Earth, Vol. 120, Issue 6; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (2)