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Geologic Setting of the Snake River Plain Aquifer and Vadose Zone

Geosciences Research Department, Idaho National Engineering and Environmental Laboratory, P.O. Box 1625, Mail Stop 2107, Idaho Falls, ID 83415-2107

View larger version (130K): [in a new window]   Fig. 1. Shaded-relief topographic map of the eastern Snake River Plain and adjacent mountain ranges of the northern Basin and Range province and the Northern Rocky Mountains.

View larger version (109K): [in a new window]   Fig. 2. The drainage basin of the Snake River Plain Aquifer has continuously grown to its present size by surface subsidence of the eastern Snake River Plain for the past 4 million years.

View larger version (53K): [in a new window]   Fig. 3. Typical eastern Snake River Plain basalt lava flow showing features that impart permeability.

View larger version (112K): [in a new window]   Fig. 4. Regional map of the eastern Snake River Plain showing volcanic rift zones, Holocene lava fields, and major faults in the adjacent Basin and Range province (modified from Kuntz et al., 1992).

View larger version (63K): [in a new window]   Fig. 5. Temperature profiles of deep wells at and near the INEEL.

View larger version (57K): [in a new window]   Fig. 6. Longitudinal section of the aquifer showing gradual warming caused by high conductive heat flow from beneath the eastern Snake River Plain.