Space-time-composition patterns of late Cenozoic mafic volcanism, southwestern Utah and adjoining areas.

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Abstract

Chemical analyses and 68 K/Ar dates for Miocene and younger mafic lava flows define space-time-composition patterns of volcanism along the boundary between the western Colorado Plateaus and the eastern Basin and Range Province in southwestern Utah and southeastern Nevada. Chemically diverse mafic volcanism occurred episodically in various areas. Following locally voluminous intermediate volcanism in the Oligocene (manifested as composite-volcano and ash-flow-erupting-caldera complexes), potassium-rich mafic lavas were erupted 25 to 21 m.y. ago in an area extending from east of Marysvale, Utah in the plateaus due west to beyond Milford, Utah, in the Basin and Range Province. After a hiatus of several million years, basalt was extruded from 14 to 11 and again from 9 to 5 m.y. ago in the same area as well as much farther southwest in the Basin and Range Province. During this mafic activity 25 to 5 m.y. ago, there was an overall progressive decrease in potassium in younger lavas in Utah and Nevada. -Authors

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Best, M. G., McKee, E. H., & Damon, P. E. (1980). Space-time-composition patterns of late Cenozoic mafic volcanism, southwestern Utah and adjoining areas. American Journal of Science, 280(10), 1035–1050. https://doi.org/10.2475/ajs.280.10.1035

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