Dissected hydrologic system at the Grand Canyon: Interaction between deeply derived fluids and plateau aquifer waters in modern springs and travertine

Citation

Material Information

Title:
Dissected hydrologic system at the Grand Canyon: Interaction between deeply derived fluids and plateau aquifer waters in modern springs and travertine
Series Title:
Geology
Creator:
Crossey, Laura J.
Fischer, Tobias P.
Patchett, Jonathan
Karlstrom, Karl E.
Hilton, David R.
Newell, Dennis L.
Huntoon, Peter
Reynolds, Amanda C.
de Leeuw, Goverdina A. M.
Publisher:
GeoScienceWorld
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Alkaline Earth Metals ( local )
Arizona ( local )
Carbonate Rocks ( local )
Coconino County Arizona ( local )
Cenozoic ( local )
Colorado Plateau ( local )
Noble Gases ( local )
Ground Water ( local )
Geochemistry ( local )
Isotopes ( local )
Mohave County Arizona ( local )
Grand Canyon ( local )
Hydrology ( local )
Strontium ( local )
Neotectonics ( local )
Quaternary ( local )
Sedimentary Rocks ( local )
Travertine ( local )
Isotope Ratios ( local )
Metals ( local )
Stable Isotopes ( local )
Tectonics ( local )
Springs ( local )
Sr-87/Sr-86 ( local )
United States ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
Geochemical study of water and gas discharging from the deeply incised aquifer system at the Grand Canyon, Arizona, provides a paradigm for understanding complex groundwater mixing phenomena, and Quaternary travertines deposited from cool springs provide a paleohydrologic record of this mixing. Geochemical data show that springs have marked compositional variability: those associated with active travertine accumulations (deeply derived endogenic waters) are more saline, richer in CO2, and elevated in 87Sr/86Sr relative to springs derived dominantly from surface recharge of plateau aquifers (epigenic waters). Endogenic waters and associated travertine are preferentially located along basement-penetrating faults. We propose a model whereby deeply derived fluids are conveyed upward via both magmatism and seismicity. Our model is supported by: (1) gas analyses from spring waters with high He/Ar and He/N2 and 3He/4He ratios indicating the presence of mantle-derived He; (2) large volumes of travertine and CO2-rich gases in springs recording high CO2 fluxes; and (3) 87Sr/86Sr in these springs that indicate circulation of waters through Precambrian basement. Geochemical trends are explained by mixing of epigenic waters of the Colorado Plateau aquifers with different endogenic end-member waters in different tectonic subprovinces. Endogenic waters are volumetrically minor but have significant effects on water chemistry. They are an important and largely unrecognized component of the hydrogeochemistry and neotectonics of the southwestern United States.
Original Version:
Geology, Vol. 34, no. 1 (2006-01-01).

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University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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