The geomorphological distribution of subaqueous tufa columns within a hypersaline lake: Mono Lake, USA

Michael Rogerson*, Claire Keevil, Ramon Mercedes-Martin, Dan Parsons, Alex Brasier, John Reijmer, Anna Matthews

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Understanding the flow of carbon through hyperalkaline lakes is a key means of understanding their biogeochemistry, sedimentology and their palaeoenvironmental and palaeoclimatic records. Furthermore, understanding how mineral precipitation is regulated in these lakes can provide insight into how their carbon sequestration behaviour can be managed. We report geophysical surveys of Mono Lake, California, USA, which show unanticipated geomorphological control on the recent / contemporary formation of lacustrine carbonate formations (“tufa”). Acquired shallow seismic data shows a fault zone below the lake floor, but despite the regional evidence for geothermal waters rising up these fractures, we find no evidence for tufa precipitation at the surface exposure of this structure, either in the seismic data or in the swath bathymetry. However, we do find sub-lacustrine tufa columns in this data elsewhere, which is the first time these have been reported directly. We find and report on a strong link between column location and meteoric Ca supply, with the latter sourced either through surface runoff or groundwater. For example, a region close to a creek inlet has more frequent and larger tufa bodies, which grow at a greater depth range, than another region far from an inlet but close to the fault. This demonstrates the importance of meteoric water ingress in regulating carbonate mineral formation in these basins, and raises the possibility that management of water within the catchment could be a means to enhance carbon capture within natural and artificial hyperalkaline lakes.
Original languageEnglish
Article number2021.034R2
JournalJournal of Sedimentary Research
Publication statusAccepted/In press - 2 Dec 2022

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