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The Three-Stage Petrochemical Evolution Of The Steens Basalt [Southeast Oregon, Usa] Compared To Large Igneous Provinces And Layered Mafic Intrusions, N. E. Moore, A. L. Grunder, Wendy A. Bohrson
The Three-Stage Petrochemical Evolution Of The Steens Basalt [Southeast Oregon, Usa] Compared To Large Igneous Provinces And Layered Mafic Intrusions, N. E. Moore, A. L. Grunder, Wendy A. Bohrson
All Faculty Scholarship for the College of the Sciences
The Steens Basalt, southeast Oregon, USA, initiated at 17 Ma as the earliest pulse of the Columbia River Flood Basalt of the northwestern USA. New and existing stratigraphically controlled data reveal temporal changes in lava flow character, and whole-rock and mineral compositions, which we use to evaluate how the balance of magma differentiation processes change in time. Temporal petrochemical variations in the Steens Basalt are analogous to the transition from Imnaha Basalt to Grande Ronde Basalt units of the Columbia River Flood Basalt and have parallels to the temporal evolution of the Deccan and Siberian traps, in India and Russia, …