| Abstract: | 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. |
| Genre: | Article |
| ProdID: | 70016970 |
| Citation Author: | Cannon, W. F. |
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| Citation End Page: | 48 |
| Citation Issue: | 1-2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Tectonophysics |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | The Midcontinent rift in the Lake Superior region with emphasis on its geodynamic evolution; 1992; Article; Journal; Tectonophysics; Cannon, W. F. |
| Citation Start Page: | 41 |
| Citation Volume: | 213 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | The Midcontinent rift in the Lake Superior region with emphasis on its geodynamic evolution; 1992; Article; Journal; Tectonophysics; Cannon, W. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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