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Rift zone. A rift zone is a feature of some volcanoes, especially shield volcanoes, in which a set of linear cracks (or rifts) develops in a volcanic edifice, typically forming into two or three well-defined regions along the flanks of the vent. [1] Believed to be primarily caused by internal and gravitational stresses generated by magma ...
Block view of a rift formed of three segments, showing the location of the accommodation zones between them at changes in fault location or polarity (dip direction) Gulf of Suez Rift showing main extensional faults In geology, a rift is a linear zone where the lithosphere is being pulled apart [1][2] and is an example of extensional tectonics. [3] Typical rift features are a central linear ...
Aulacogen formation starts with the termination of an active rift zone, which leaves behind a graben -like formation. Over time, this formation starts to subside and eventually minor volcanism starts to take place.
Prior to the rift's formation, enormous continental flood basalts erupted, uplifting the Ethiopian, Somali, and East African plateaus. The first stage of rifting of the EAR was characterized by rift localization and magmatism along the entire rift zone.
The Southern Oklahoma Aulacogen (ah-lah-coh-jin) ⓘ is a failed rift, or failed rift arm (aulacogen), of the triple junction that became the Iapetus Ocean spreading ridges. It is a significant geological feature in the Western and Southern United States. It formed sometime in the early to mid Cambrian Period and spans the Wichita Mountains ...
In individual rift segments, one polarity (i.e. dip direction) normally dominates, giving a half-graben geometry. [6] Other common geometries include metamorphic core complexes and tilted blocks. Examples of active continental rifts are the Baikal Rift Zone and the East African Rift.
Midcontinent Rift System. 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 ...
Divergent boundary. In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other. Divergent boundaries within continents initially produce rifts, which eventually become rift ...