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The Midcontinent rift in the Lake Superior region with emphasis on its geodynamic evolution

January 1, 1992

The Midcontinent rift is a Middle Proterozoic continental rift which records about 15 m.y. of extension, subsidence, and voluminous volcanism in the period 1109-1094 Ma in the central part of North America. During that time the crust was nearly totally separated and as much as 25 km of subaerial basalts accumulated in a deep central depression. Following extension and volcanism, a longer period of subsidence resulted in development of a post-rift sedimentary basin in which as much a 8 km of fluvial and lacustrine clastic rocks were deposited. Partial inversion of the central depression occurred about 30-50 m.y. after extension to produce the current configuration of a central horst, composed mostly of thick volcanic accumulations, between shallower flanking basins. ?? 1992.

Citation Information

Publication Year 1992
Title The Midcontinent rift in the Lake Superior region with emphasis on its geodynamic evolution
DOI
Authors W. F. Cannon
Publication Type Article
Publication Subtype Journal Article
Series Title Tectonophysics
Series Number
Index ID 70016970
Record Source USGS Publications Warehouse
USGS Organization