WebFeb 10, 2008 · The Columbia River Basalt Group in the northwestern United States, derived from flood basalt eruptions that occurred 16 million years ago, exhibits variability in geography and trace element ... WebSep 19, 2024 · The Columbia River Basalt Group (CRBG) is the youngest, smallest, and best-preserved continental flood basalt. It erupted ~210,000 km 3 of lava in the Pacific …
Columbia River basalts Idaho State University - ISU
WebThe Columbia River Basalt Group covers an area of more than 210,000 km 2 with an estimated volume of 210,000 km 3.As the youngest continental flood-basalt province on Earth (16.7–5.5 Ma), it is well preserved, with a coherent and detailed stratigraphy exposed in the deep canyonlands of eastern Oregon and southeastern Washington. WebJan 31, 2024 · The age distribution patterns of Columbia River Rhyolites have implications for the arrival, location, and dispersion of flood basalt magmas in the crust. We consider the period from 17.5 to 16.4 Ma to be the waxing phase of rhyolite activity and the period from 15.3 to 14.5 Ma to be the waning phase. santa fe snow
The Columbia River Flood Basalt Province - GeoScienceWorld
WebMay 1, 2007 · The Snake River Plain province is inferred to have been initiated by the Miocene (ca. 20-17 Ma) mantle upwelling that resulted in the Columbia River flood basalt province (e.g., Camp, 1995; Hooper ... WebMay 14, 2024 · The Miocene Columbia River Basalt Group (CRBG) is the youngest and best studied continental flood basalt province on Earth. The 210,000 km 3 of basaltic lava flows in this province were fed by a series of dike swarms, the largest of which is the Chief Joseph dike swarm (CJDS) exposed in northeastern Oregon and southwestern … WebAug 1, 2013 · The Steens Formation, or Steens Basalt, is formally recognized as the oldest lithostratigraphic unit of the Columbia River Basalt Group, with an estimated areal extent and volume of 53,000 km 2 and 31,800 km 3, respectively.Later eruptions became more focused at the presumed shield volcano at Steens Mountain, where dikes exploited a … short pump heating and air conditioning