DCO Project Summary

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Project Title
Solubility of Carbonate Minerals and CO2 Speciation in Subduction Zone Fluids
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Carbon is subducted at convergent margins, but the capacity for fluids that are expelled from subducting slabs to carry carbon, and by extension the mobility of carbon during subduction, is not well known. We are undertaking high pressure experiments (DAC) on carbonate minerals, as well as numerical simulations to constrain the solubility of carbon (specifically calcite) in subduction zone fluids.

Experimental work at UCLA has focused on two aspects of calcium carbonate minerals at high pressure and temperature: their solubility in aqueous solutions, and trace element substitution into the carbonate mineral lattice. University of Lyon work has focused on in situ micro-Raman analysis of CaCO3 minerals (calcite, aragonite) dissolving in water in the diamond anvil cell at (P, T), 0.5 to 8 GPa and 250 to 500°C. The experimental results will be compared with the theoretical calculations in June 2012 during the visit of D. Sverjensky at the University of Lyon. Theoretical calculations of calcite solubility have been carried out for comparison with experimental data. The overall goal is be able to extend these calculations to pressures relevant to subduction zones.

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Reporting Year 2012 Click to expand

  • RY2012-1 - submitted on Jan 01, 2012

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    [2012-01-01] Assembled research team. High pressure partitioning experiments and solubility experiments are underway.
  • RY2012-2 - submitted on Feb 01, 2012

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    [2012-02-01] Attended Deep Carbon Observatory Leadership Workshop 7-10 February, 2012.
  • RY2012-3 - submitted on Mar 01, 2012

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    [2012-03-01] C.M. presented related work at Ninth International Workshop on Water Dynamics in Sendai, Japan.
  • RY2012-4 - submitted on Jun 01, 2012

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    [2012-06-01] S.F. and D.I. presented calcite solubility experiments at GeoRaman Meeting in Nancy, France.
  • RY2012-5 - submitted on Jun 01, 2012

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    [2012-06-01] Compared experimental results to numerical simulations.
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