Long-term performance of a mudrock seal in natural CO2 storage
Jiemin Lu et al., School of GeoSciences, The University of Edinburgh, Edinburgh EH9 3JW, Scotland. Pages 35-38.
Geological storage of anthropogenic CO2 (carbon sequestration) is cited as a critical technology to battle against global warming, driven by increasing amounts of greenhouse gases in the atmosphere. Safe storage requires a robust cap rock to hold CO2 in the injection zone deep underground for tens of thousand years. Lu et al. studied a mudrock unit from an oilfield with naturally high CO2 under the North Sea. For the first time, they measured, using analysis of minerals in the rock, that CO2 only moved 10 meters (30 feet) in 60 million years. This proves that natural rock units can perform very well as safe seals to store injected CO2 and prevent upward leakage for time scales much longer than required.
Deep mantle diamonds from South Australia: A record of Pacific subduction at the Gondwanan margin
Ralf Tappert et al., Geology and Geophysics, School of Earth and Environmental Sciences, University of Adelaide, 5005, South Australia. Pages 43-46.
Tappert et al. have discovered that ultradeep diamonds from Australia formed in remnants of the Pacific plate, which was subducted deep beneath the former supercontinent Gondwana. Ultradeep diamonds from Eurelia, South Australia, grew at depths of around 670 km, which is much deeper than most other diamonds in the world. The composition of the diamonds provides evidence that they grew deep beneath the Gondwanan supercontinent in subducted oceanic rocks. The kimberlites that host
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