Upper Elk Point subgroup paleogeography and evaporite distribution with implications for evaporite dissolution, karstification, and carbonate diagenesis in northeastern Alberta

A new paleogeographic reconstruction of the Upper Elk Point subgroup in northeastern Alberta reveals critical insights into evaporite dissolution, karstification, and carbonate diagenesis. The study identifies the La Crete sub-basin as a hotspot for active gypsification—where anhydrite rehydrates to gypsum due to meteoric inflow—and links this process to the formation of porous dedolomite zones in carbonates. These zones act as aquifers, contributing high-salinity Devonian water inflows to oil sands mine pits. Detailed net-thickness mapping of halite, anhydrite, and gypsum shows that sulphate dissolution progresses top-down, with circular karst lakes serving as surface indicators of underlying meteoric conduits. This research provides a robust framework for understanding evaporite distribution, dissolution patterns, and their implications for both geological processes and economic impacts in the region.

Hauck, T. E., & Grobe, M. (2020). Upper Elk Point subgroup paleogeography and evaporite distribution with implications for evaporite dissolution, karstification, and carbonate diagenesis in northeastern Alberta. Bulletin of Canadian Petroleum Geology, 68(4), 91–122. https://doi.org/10.35767/gscpgbull.68.4.91