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Krypton-81 dating constrains timing of deep groundwater flow activation

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Created:	Jan 13, 2022 at 5:10 p.m.
Last updated:	May 18, 2022 at 4:14 a.m.
DOI:	10.4211/hs.d2a724a994b34fa3880ca21562912788
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Sharing Status:	Published
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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.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:

WGS 84 EPSG:4326

Coordinate Units:

Decimal degrees

Place/Area Name:

Paradox Basin, Utah and Colorado

Longitude

-109.2489°

Latitude

38.1715°

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How to Cite

Kim, J. (2022). Krypton-81 dating constrains timing of deep groundwater flow activation, HydroShare, https://doi.org/10.4211/hs.d2a724a994b34fa3880ca21562912788

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/