Defining Fe and H Speciation During Olivine Carbonation Under Highly Reducing Conditions
- Univ. of Colorado, Boulder, CO (United States). Dept. of Geological Sciences
The overarching goal of this DOE EC project has been to examine the connections among the geochemical behavior of iron, and the extent of hydrogen, methane or carbonate mineral formation during the aqueous alteration of olivine and pyroxene bearing rocks at near surface temperatures and pressures. We used an integrated suite of microscale x-ray scattering and spectroscopic techniques to interrogate the reactivity and progressive alteration of peridotites during water/rock interaction. We also identified microbial communities in alkaline subsurface fluids, and their role in H2-consumption and methane production. A third research thrust integrated these themes, and involved measuring the stable isotope composition (δD and δ13C) of hydrogen, water and methane from subsurface fluids and our peridotite hydration experiments to determine whether the water-rock reaction pathways (including biologically influenced systems) can be detected and interpreted in-situ.
- Research Organization:
- Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- SC0006886
- OSTI ID:
- 1485305
- Report Number(s):
- DE-SC-0006886-Final Report; 3034929660
- Country of Publication:
- United States
- Language:
- English
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