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aulacogen
In geology, an aulacogen is a failed arm of a triple junction of a plate tectonics rift system. A triple junction beneath a continental plate initiates a three way breakup of the continental plate. As the continental break-up develops one of the three spreading ridges typically fails or stops spreading. The resulting failed rift is called an aulacogen and becomes a filled graben system within the continent.
==Origin of term==
The term "aulacogen" is derived from the Greek ''aulax'' (furrow) and was suggested by the Soviet geologist Nicholas Shatski in 1946.〔 Nicholas S. Shatski, 1946, The Great Donets basin and the Wichita System; comparative tectonics of ancient platforms: Akademiia Nauk SSSR Doklady, Geology Series, No. 6, p. 57-90. 〕〔(Aulacogens and Continental Breakup ) 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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