The three-stage petrochemical evolution of the Steens Basalt (southeast Oregon, USA) compared to large igneous provinces and layered mafic intrusions

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 e...

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Veröffentlicht in:	Geosphere (Boulder, Colo.) Colo.), 2018-12, Vol.14 (6), p.2505-2532
Hauptverfasser:	Moore, N. E, Grunder, A. L, Bohrson, W. A
Format:	Artikel
Sprache:	eng
Schlagworte:	Africa alkaline earth metals andesites basalts Bushveld Complex Cenozoic chemostratigraphy Columbia River Basalt Group composition crust crystal fractionation Deccan Traps flood basalts homogeneity igneous and metamorphic rocks igneous rocks intrusions large igneous provinces lava lava flows mafic composition magmas magnesium metals Miocene Montana Neogene Oregon Petrology Siberian Traps South Africa southeastern Oregon Southern Africa Steens Basalt Stillwater County Montana stratigraphy temporal distribution Tertiary United States viscosity volcanic rocks
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