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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.
Called the Midcontinent Rift (MCR), this 3000-kilometer-long feature, made of 1.1-billion-year-old igneous and sedimentary rocks, extends underground across the central United States. It...
The Midcontinent Rift System (MRS) is a 1.1 Ga sequence of voluminous basaltic eruptions and multiple intrusions followed by widespread sedimentation that extends across the Midcontinent and northern Great Lakes region of North America.
In North America: 1.3 billion to 950 million years ago. The Midcontinent Rift developed contemporaneously with northwest-directed crustal-scale thrusting in the Grenville orogenic belt.
The copper that was mined in the Keweenaw formed during a spectacular period in Earth's history—at a time when the North American continent was splitting apart. This separation began about 1.1 billion years ago and at its peak had a length of over 3,000 kilometers.
One of the most prominent features on gravity and magnetic maps of North America is the Midcontinent Rift (MCR), an extensive band of buried igneous and sedimentary rocks that outcrop around Lake Superior (Fig. 1A).
The Midcontinent Rift System, which curves for more than 2000 km across the Upper Midwest, is one of the world’s great continental rifts. Rifting began about 1.1 billion years ago, when the Earth’s crust began to split along the margin of the Superior craton.
The ca. 1100 Ma old Midcontinent Rift System (MRS) 1 is arguably the most significant non-orogenic tectonic feature of mid-North America because of its major disturbance of the lithosphere, vast extent, impact on latter tectonism of the region, and its earth resources. It is the most prominent feature of gravity and magnetic anomaly maps of ...
Known as the Midcontinent Rift System (MCRS), this structure is a 1.1 billion-year-old, about 1,800-mile (3,000 km) long scar along which the North American continent started to tear apart, but...
New aeromagnetic data from the north central United States are helping geophysicists and geologists better understand the 1.1-billion-year-old mid-continent rift, one of the fundamental components of the Precambrian basement of North America.