Great new manuscript published by Lin, Zheng, Ye and Power in Carbonates & Evaporites. This study documents the hydromagnesite deposits from Dujiali Lake, central Qinghai-Tibetan Plateau and its trace and rare earth element geochemistry.
Dujiali Lake, central Qinghai–Tibetan Plateau, China.
Image of microfluidics experiment showing mineral-rich and -poor zones that impact geochemical reactions.
Harrison et al. publishes "Changes in mineral reactivity driven by pore fluid mobility in partially wetted porous media" in Chemical Geology (2017). This innovative study led by Anna Harrison explores mineral reactivity at the pore-scale using microfluidics experiments.
Excited to announce that I'll be starting as an Assistant Professor in Environmental Geosciences at Trent University in Peterborough, Ontario beginning June 1st.
Hydromagnesite plates amongst magnesium oxychloride cement crystals.
Assessing the carbon sequestration potential of magnesium oxychloride cement building materials
Magnesium oxychloride cement (MOC) boards have the potential to offset carbon emissions through mineral carbonation, a process whereby carbon dioxide (CO2) is converted to carbonate minerals. Boards (0-15 years old) contained MOC phase 5 (21-50 wt.%), brucite, primary (e.g., magnesite) and secondary (hydromagnesite and chlorartinite) carbonate minerals. Quantitative mineralogy, electron microscopy and carbon abundance data demonstrate that secondary carbonates form through the reactions of MOC and brucite with CO2 within interfacial water layers after board manufacturing. Stable carbon isotopic data confirmed the source of sequestered CO2 as being the atmosphere. Carbonation rates were approximately 0.07 kg CO2/m2 board/year or 9 kg CO2/t board/year over 15 years, offsetting ~20-40% of estimated carbon emissions. In experiments using 10% and 100% CO2 gas, carbonation was accelerated by approximately 400 and 1600 times in comparison to the passive rate. Integration of carbonation reactions into MOC board production could provide significant carbon offsets.