scholarly journals Preliminary reconnaissance geologic maps of the Columbia River Basalt Group in parts of eastern Washington and northern Idaho

1979 ◽  
Author(s):  
Donald A. Swanson ◽  
R.D. Bentley ◽  
G.R. Byerly ◽  
J.N. Gardner ◽  
T.L. Wright
Keyword(s):  
Columbia River ◽  
Columbia River Basalt ◽  
Geologic Maps ◽  
Northern Idaho ◽  
Eastern Washington ◽  
Columbia River Basalt Group

scholarly journals Annually resolved sediments in the classic Clarkia lacustrine deposits (Idaho, USA) during the middle Miocene Climate Optimum

Geology ◽  
2021 ◽  
Author(s):  
Daianne Höfig ◽  
Yi Ge Zhang ◽  
Liviu Giosan ◽  
Qin Leng ◽  
Jiaqi Liang ◽  
...  
Keyword(s):  
Middle Miocene ◽  
Drainage System ◽  
Columbia River ◽  
Flood Basalt ◽  
Elemental Ratios ◽  
Plant Fossil ◽  
Columbia River Basalt ◽  
Mineral Assemblages ◽  
Northern Idaho ◽  
Columbia River Basalt Group

The world-renowned Miocene Clarkia paleolake in northern Idaho (USA) is closely associated with Columbia River Basalt Group volcanism. The flood basalt dammed a local drainage system to form the paleolake, which preserved a plant fossil Lagerstätte in its deposits. However, the precise age and temporal duration of the lake remain unsettled. We present the first unequivocal U-Pb zircon ages from interbedded volcanic ashes at the P-33 type location, constraining the deposition to 15.78 ± 0.039 Ma. Using micro–X-ray fluorescence and petrographic and spectral analyses, we establish the annual characteristics of laminations throughout the stratigraphic profile using the distribution of elemental ratios, mineral assemblages, and grain-size structures, as well as organic and fossil contents. Consequently, the ~7.5-m-thick varved deposit at the type location P-33 represents ~840 yr of deposition, coincident with the end of the main phase of Columbia River Basalt Group eruptions during the Miocene Climate Optimum. The timing and temporal resolution of the deposit offer a unique opportunity to study climate change in unprecedented detail during global warming associated with carbon-cycle perturbations.

Temporally variable crustal contributions to primitive mantle-derived Columbia River Basalt Group magmas

2021 ◽  
pp. 120197
Author(s):  
James M.D. Day ◽  
Kimberley L.R. Nutt ◽  
Brendon Mendenhall ◽  
Bradley J. Peters
Keyword(s):  
Columbia River ◽  
Primitive Mantle ◽  
Columbia River Basalt ◽  
Columbia River Basalt Group

Imnaha Basalt, Columbia River Basalt Group

1984 ◽  
Vol 25 (2) ◽  
pp. 473-500 ◽  
Author(s):  
P. R. HOOPER ◽  
W. D. KLECK ◽  
C. R. KNOWLES ◽  
S. P. REIDEL ◽  
R. L. THIESSEN
Keyword(s):  
Columbia River ◽  
Columbia River Basalt ◽  
Columbia River Basalt Group

scholarly journals Supplemental Material: The Chief Joseph dike swarm of the Columbia River flood basalts, and the legacy data set of William H. Taubeneck

2020 ◽  
Author(s):  
M.C. Morriss ◽  
et al.
Keyword(s):  
Pacific Northwest ◽  
Large Scale ◽  
Columbia River ◽  
Flood Basalts ◽  
Data Set ◽  
Dike Swarm ◽  
Columbia River Basalt ◽  
Legacy Data ◽  
Columbia River Basalt Group ◽  
Columbia River Flood Basalts

Supplemental Plates. Plate S1: Large-scale map of entire extent of Chief Joseph dike swarm. Also incorporates dikes of Ice Harbor, Steens, and Monument swarms. Plate S1 represents the most complete record of dikes related to Columbia River Basalt Group (CRBG) event known. Plate S2: Simplified map of CRBG-related dikes across the inland Pacific Northwest. Dikes are colored by their orientation and dike line density is also shown. Plate S3: Simplified map of CRBG-related dikes across the inland Pacific Northwest.<br>

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