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The Midcontinent Rift System (MRS) or Keweenawan Rift is a 2,000 km (1,200 mi) long geological rift in the center of the North American continent and south-central part of the North American plate. It formed when the continent's core, the North American craton , began to split apart during the Mesoproterozoic era of the Precambrian , about 1.1 ...
One billion years ago, the Midcontinent Rift System began to extend along a 2,000 kilometres (1,200 mi) path, [10] across both the Canadian Shield and the Stable Platform. The rift failed, then crustal movement reversed. A range formed then eroded, forming basins on either side of a horst.
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The Midcontinent Rift System in North America is marked by a series of horsts extending from Lake Superior to Kansas. [ 12 ] The Rwenzori Mountains in the East African Rift are an upthrown fault block, and are the highest non-volcanic, non-orogenic mountains in the world.
Over 1,100 mya, a rift formed and lava emerged from cracks along the edges of the rift valley. This Midcontinent Rift System extended from the lower peninsula of Michigan north to the current Lake Superior, southwest through the lake to the Duluth area, and south through eastern Minnesota down into what is now Kansas. [5]
The West and Central African Rift System; The Red Sea Rift; The Gulf of California; The Baikal Rift Zone, the bottom of Lake Baikal is the deepest continental rift on the earth. The Gulf of Suez Rift; Throughout the Basin and Range Province in North America; The Rio Grande Rift in the southwestern US; The rift zone that contains the Gulf of ...
Members of the Keweenawan Supergroup are exposed at the surface only in the Lake Superior region, particularly at the perimeter of the Midcontinent Rift System. To the southeast and southwest, they are covered by sedimentary rocks of Paleozoic age. At its thickest, the supergroup consists of about 20 kilometers (12 mi) of volcanic rocks ...