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Deep Meteoric Water Circulation in Earth's Crust
  • Jennifer McIntosh,
  • Grant Ferguson
Jennifer McIntosh
University of Arizona, University of Arizona, University of Arizona

Corresponding Author:mcintosh@hwr.arizona.edu

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Grant Ferguson
University of Saskatchewan, University of Saskatchewan, University of Saskatchewan
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Abstract

Deep meteoric waters comprise a key component of the hydrologic cycle, transferring water, energy, and life between the earth’s surface and deeper crustal environments, yet little is known about the nature and extent of meteoric water circulation. Using water stable isotopes, we show that the maximum circulation depths of meteoric waters across North America vary considerably from <1 to 5 km, with the deepest circulation in western North America in areas of greater topographic relief. Shallower circulation occurs in sedimentary and shield-type environments with subdued topography and shallow brines. The amount of topographic relief available to drive regional groundwater flow and flush saline fluids is the primary control on the extent of meteoric water circulation, rather than permeability. The presence of an active flow system in the upper few km of the Earth’s crust and stagnant brines trapped by negative buoyancy offers a new framework for understanding deep groundwater systems.
16 Mar 2021Published in Geophysical Research Letters volume 48 issue 5. 10.1029/2020GL090461