Krypton-81 dating constrains timing of deep groundwater flow activation
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| Owners: | Ji-Hyun Kim |
| Type: | Resource |
| Storage: | The size of this resource is 31.6 KB |
| Created: | Jan 13, 2022 at 5:10 p.m. |
| Last updated: | May 18, 2022 at 4:14 a.m. (Metadata update) |
| Published date: | May 18, 2022 at 4:14 a.m. |
| DOI: | 10.4211/hs.d2a724a994b34fa3880ca21562912788 |
| Citation: | See how to cite this resource |
| Sharing Status: | Published |
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| Views: | 1175 |
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Abstract
Krypton-81 dating provides new insights into the timing, mechanisms, and extent of meteoric flushing versus retention of saline fluids in the subsurface in response to changes in geologic and/or climatic forcings over 50 ka to 1.2 Ma year timescales. Remnant Paleozoic seawater-derived brines associated with evaporites in the Paradox Basin, Colorado Plateau, are beyond the 81Kr dating range (>1.2 Ma) and have likely been preserved due to negative fluid buoyancy and low permeability. 81Kr dating of formation waters above the evaporites indicates topographically-driven meteoric recharge and salt dissolution since the Late Pleistocene (0.03-0.8 Ma). Formation waters below the evaporites (up to 3 km depth), in basal aquifers, contain relatively young meteoric water components (0.4-1.1 Ma based on 81Kr) that partially flushed remnant brines and dissolved evaporites. We demonstrate that recent, rapid denudation of the Colorado Plateau (<4-10 Ma) activated deep, basinal-scale flow systems as recorded in 81Kr groundwater age distributions.
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