Deep Meteoric Water Circulation in Earth's Crust

Jennifer C. McIntosh, Grant Ferguson

Research output: Contribution to journalArticlepeer-review

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 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. The amount of topographic relief available to drive regional groundwater flow and flush saline fluids is an important control on the extent of meteoric water circulation, in addition to permeability. The presence of an active flow system in the upper few kilometers of the Earth's crust and stagnant brines trapped by negative buoyancy offers a new framework for understanding deep groundwater systems.

Original languageEnglish (US)
Article numbere2020GL090461
JournalGeophysical Research Letters
Volume48
Issue number5
DOIs
StatePublished - Mar 16 2021

Keywords

  • Critical Zone
  • Groundwater hydrology
  • Groundwater transport
  • Stable isotope geochemistry

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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