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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]
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 ...
Stages of the rift zone formation a. beginning of the uplift b. beginning of the rift zone with some magma chambers c. volcano formation and beginning of the crust spreading: Date: 3 April 2014: Source: using the idea of the rift zone formation and making it by using adobe illustrator and photoshop: Author: Suhib almasmoom
A map of East Africa showing some of the historically active volcanoes (as red triangles) and the Afar Triangle (shaded at the center), which is a so-called triple junction (or triple point) where three plates are pulling away from one another: the Arabian Plate and two parts of the African Plate—the Nubian and Somali—splitting along the East African Rift Zone Main rift faults, plates ...
Rift valleys are also known to occur on other terrestrial planets and natural satellites. The 4,000 km long Valles Marineris on Mars is believed by planetary geologists to be a large rift system. [ 7 ] [ 8 ] Some features of Venus, most notably, the 4,000 km Devana Chasma [ 9 ] and a part of the western Eistla, and possibly also Alta and Bell ...
The largest fault it contains is the Morskiy Fault; however, another fault, the Primorsky is becoming the primary fault in the rift. [6] The basins also display evidence of crustal thinning below the rift zone. [7] The thickness of the crust beneath the rift is disputed, as the structures of the rift deep beneath the surface are unknown.
The failed arm of a triple junction can be either a transform fault that has been flooded with magma, or more commonly, an inactive rift zone. [2] Aulacogen formation starts with the termination of an active rift zone, which leaves behind a graben -like formation.
The Shanxi Rift System or Fen–Wei Rift System [1] is a zone of active extensional tectonics that forms the eastern margin of the Ordos Block in northern China. The zone extends for at least 900 km (560 mi) and runs south-southwest to north-northeast.