Tutolo Reactive Transport Group


Our overarching goal is to distill simple, cause-and-effect relationships out of complex Earth systems.


Projects

Serpentinization as a Reactive Transport Process

Serpentinization, or the hydrothermal alteration of olivine-rich rocks, plays a fundamental role in the biogeochemical and tectonic evolution of the Earth and perhaps many other rocky planetary bodies. Yet, geochemical models still fail to produce accurate predictions of the various modes of serpentinization, which limits our ability to predict a variety of related geological phenomena over many spatial and temporal scales.  RTG research is showing that serpentinization and many other hydrothermal processes must be considered in a reactive transport framework whereby fluid, solute, and heat transport are intimately coupled to kinetically-controlled reactions.  Simone Pujatti is the primary group member working on this research.

Serpentine Veins
Mannville siderite

CO2 storage in sedimentary reservoirs

Abundant pore space is available in spent oil and gas reservoirs and deep saline aquifers for the permanent storage of anthropogenic CO2.  Our work in this field focuses on harvesting the potential of  converting glauconite-rich greensands formations into siderite, as a safe, permanent CO2 storage mechanism.  We are taking a multi-technique approach to this research problem that includes detailed petrographic study of naturally carbonated glauconitic sandstones, experimental determination of the dissolution and carbonation rates of glauconite, and numerical modeling of CO2 injection into and interaction with greensands formations.  Qin Zhang is the primary group member working on this project.

Solid Carbon: A Negative Emissions Technology

Solid Carbon is an ambitious project to permanently and safely sequester carbon dioxide (CO2) as rock.  The vision is to extract CO2 directly from the air or ocean. Then, using deep ocean technology powered by ocean-based wind and solar energy, inject the CO2 into the subseafloor basalt, where it mineralizes into solid carbonate rock.   RTG researchers are performing experiments and running reactive transport models to evaluate this technology.  More info can be found on the Solid Carbon web page Dr. Adedapo Awolayo, John Byng, and Calista Brown are the primary group members working on this project.

Basalt
experimentally silicified carbonate

Diagenesis in sedimentary rocks

We are working to contrain the rates and mechanisms of diagenesis in sedimentary rocks.  This research focuses on the rates and mechanisms of silicification of carbonate rocks as well as early diagenetic reactions in alkaline lakes, such as those of the Cariboo Plateau in British Columbia.  To tackle these research problems, we are using a combination of laboratory experiments, geophysical and geochemical observations in the field, and reactive transport modeling.  Simone Pujatti, Qin Zhang, and Jasmine Chase are the primary group members working on this project.

Mg-silicate growth kinetics from ambient to hydrothermal conditions

Mg-silicate minerals, such as sepiolite, lizardite, chrysotile, and talc, form in an amazing variety of Earth environments, ranging from alkaline lakes to seafloor hydrothermal systems.  Importantly, they are also a primary constituent of the scales that form in geothermal wells and steam production equipment.  To constrain the solubilities of these various minerals and the rates at which they from from solution, we are running batch and flow-through experiments at temperatures up to 350°C.  Dr. Yury Klyukin and Zhengqiang Che are the primary group members working on this project.

Sepiolite

Techniques

XRD patterns from Oman Drilling Project

Although a primary component of our research involves numerical modeling using software as the ever-useful Geochemist's Workbench and the reactive transport simulator PFLOTRAN ,  quite a significant amount of our efforts are directed towards performing experiments in the lab and characterizing field samples, particularly drill cores from the Integrated Ocean Drilling Program (IODP).  To characterize field and experimental samples, we employ a range of techniques.  These include high resolution X-Ray Computed Tomography (XRCT) at laboratory and synchrotron sources; we maintain high performance visualization and processing computer and specialized software for handling these large data sets.  In addition, we often utilize combined Small and Ultra Small Angle Neutron Scattering ((U)SANS) at the NIST Center for Neutron Research (NCNR), ISIS Neutron Source or at the Institut Laue-Langevin.  We have also been using X-ray Absorption Near-Edge Structure (XANES) at Brookhaven National Laboratory (NSLS-II) and Diamond Light Source to constrain oxidation states of Fe in our samples.  We have recently added a Horiba Xplora Plus Raman Microscope and a Triple Quadrupole ICP-MS to our lab facilities; both are open for use.  We also often make use of a wide variety of mineralogical, chemical, and (non-traditional) stable isotopic characterization tools available here at Calgary and through collaborations with colleagues.  See Lab page for more information.


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