Aulacogen
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. In A, volcanoes form along a continental plate boundary. B shows the triple junction's basic appearance following its formation. C shows that one of the three "arms" has not split while the other two do, continuing into D, in which the Iapetus Ocean forms. An aulacogen is a failed arm of a triple junction. Aulacogens are a part of plate tectonics where oceanic and continental crust is continuously being created, destroyed, and rearranged on the Earth’s surface. Rift zones are places where new crust is formed. An aulacogen is a rift zone that is no longer active.
. In A, volcanoes form along a continental plate boundary. B shows the triple junction's basic appearance following its formation. C shows that one of the three "arms" has not split while the other two do, continuing into D, in which the Iapetus Ocean forms. An aulacogen is a failed arm of a triple junction. Aulacogens are a part of plate tectonics where oceanic and continental crust is continuously being created, destroyed, and rearranged on the Earth’s surface. Rift zones are places where new crust is formed. An aulacogen is a rift zone that is no longer active.
Origin of term
The term aulacogen is derived from Greek aulax 'furrow' and was suggested by the Soviet geologist Nikolay Shatsky in 1946.
Examples
Asia
The Cambay rift in India The Kutch rift in India
References
Text derived from https://en.wikipedia.org/w/index.php?oldid=1367783344 under CC BY-SA 4.0; modifications have been made.