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The rifts in western Ohio form part of the East Continent Rift Zone, which is covered in six kilometers of undeformed sandstones and other silicate sedimentary rocks. The collision of the Grenville Province with Proto-North America resulted in the long-lasting Grenville orogeny , producing a tall mountain range.
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 ...
The Wabash Valley seismic zone consists largely of vertically oriented ("normal") faults deeply buried under layers of sediment. Although the tectonics of the region are not fully understood and are the subject of ongoing research, these faults are thought by some to be associated with a branch of the New Madrid aulacogen, an old rift zone where the lithosphere actively began to pull apart at ...
Magnetic potential map of the Reelfoot Rift The New Madrid seismic zone (NMSZ), sometimes called the New Madrid fault line (or fault zone or fault system ), is a major seismic zone and a prolific source of intraplate earthquakes (earthquakes within a tectonic plate ) in the Southern and Midwestern United States , stretching to the southwest ...
Some of the fracture zones in the western Pacific Ocean are associated with the smaller plate boundaries of the active back-arc basin spreading center of the North Fiji Basin being the Hunter fracture zone and North Fiji fracture zone. The Parece Vela Rift (Parece Vela fracture zone province) is also associated with the back-arc basin of the ...
The rift zone known as the mid-Atlantic ridge continued to provide the raw volcanic materials for the expanding ocean basin. [20] North America was slowly pulled westward away from the rift zone. The thick continental crust that made up the new east coast collapsed into a series of down-dropped fault blocks that roughly parallel today's coastline.
Obduction zones occurs when the continental plate is pushed under the oceanic plate, but this is unusual as the relative densities of the tectonic plates favours subduction of the oceanic plate. This causes the oceanic plate to buckle and usually results in a new mid-ocean ridge forming and turning the obduction into subduction.
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