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Hydrogeology of the Columbia River Basalt Group in the Columbia Plateau; road log and field trip stop descriptions

Kevin A. Lindsey, David Morgan, Dimitri Vlassopoulos, Terry L. Tolan and Eric Burns
Hydrogeology of the Columbia River Basalt Group in the Columbia Plateau; road log and field trip stop descriptions (in Volcanoes to vineyards; geologic field trips through the dynamic landscape of the Pacific Northwest, Jim E. O'Connor (editor), Rebecca J. Dorsey (editor) and Ian P. Madin (editor))
Field Guide (Geological Society of America) (December 2009) 15: 673-696

Abstract

In portions of Washington, Oregon, and Idaho, the Columbia River Basalts Group (CRBG) hosts a regional aquifer system that is the primary, and in many cases the only, water supply for numerous communities, small water systems, individual homes, industry, and agriculture. In much of the semiarid Columbia Plateau, portions of the CRBG aquifer system have seen significant water-level declines and do not appear to receive significant, if any natural recharge. Aquifer horizons within the Columbia River basalts generally are associated with intraflow structures at the top (e.g., vesicular flow-top breccias) and bottom (e.g., flow-foot breccias, pillow lava and hyaloclastite complexes) of sheet flows. The interiors of thick sheet flows (in their undisturbed state) have extremely limited permeability and act as aquitards, typically creating a series of stacked, confined aquifers within the Columbia River basalt aquifer system. The dominant groundwater flow follows horizontal to subhorizontal pathways along individual, laterally extensive, interflow zones. Vertical groundwater movement through undisturbed basalt flow interiors is greatly restricted except where basalt flow interiors are disturbed (such as by folds or faults), truncated (such as by flow pinchouts and erosional windows), or where they are cross-connected by wells.


ISSN: 2333-0937
EISSN: 2333-0945
Serial Title: Field Guide (Geological Society of America)
Serial Volume: 15
Title: Hydrogeology of the Columbia River Basalt Group in the Columbia Plateau; road log and field trip stop descriptions
Title: Volcanoes to vineyards; geologic field trips through the dynamic landscape of the Pacific Northwest
Author(s): Lindsey, Kevin A.Morgan, DavidVlassopoulos, DimitriTolan, Terry L.Burns, Eric
Author(s): O'Connor, Jim E.editor
Author(s): Dorsey, Rebecca J.editor
Author(s): Madin, Ian P.editor
Affiliation: GSI Water Solutions, Kennewick, WA, United States
Affiliation: U. S. Geological Survey, Portland, OR, United States
Pages: 673-696
Published: 200912
Text Language: English
Publisher: Geological Society of America, Boulder, CO, United States
References: 35
Accession Number: 2010-060180
Categories: Hydrogeology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N45°30'00" - N49°00'00", W124°45'00" - W116°55'00"
N44°00'00" - N48°30'00", W120°00'00" - W115°00'00"
N42°00'00" - N49°00'00", W117°15'00" - W111°04'60"
N42°00'00" - N46°19'60", W124°34'60" - W116°34'60"
Secondary Affiliation: University of Oregon, USA, United StatesOregon Department of Geology and Mineral Industries, USA, United StatesU. S. Geological Survey, USA, United StatesS. S. Papadopulos and Associates, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201033
Program Name: USGSOPNon-USGS publications with USGS authors
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