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Devana Chasma is an weak extensional rift zone on Venus, with a length of 4000 km, a width of 150 250 km, and a depth reaching 5 km. Most of the faults are facing north-south. The rift is located in Beta Regio. A 3000 km rise is due volcanic activity. Mantle plumes rising from the bottom are the reason behind the formation of the rift zone. The slow extension rates in the rift may be driven by the same reason.〔Kiefer, W. S., and L. C. Swafford. "Topographic Analysis Of Devana Chasma, Venus; Implications For Rift System Segmentation And Propagation." Journal Of Structural Geology 28.12 (2006): 2144–2155. GeoRef. Web. 27 Feb. 2014.〕〔〔 ==Geology of Devana Chasma== General history of the region 〔 The formation of the region went through different events with time: #Uplifting of the mantle plume in Beta Regio and Phoebe Regio: The rising of the mantle plume pushes the crust to create the volcanic rises. #Formation of Theia Mons Volcano and Devana Chasma: The lava escapes through the crust forming Theia Mons volcano and the begin of the rifting. #Overlapping of the two mantle plumes forming the offset zone: The offset zone is formed when the two different plumes change in their thermal energy 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Devana Chasma」の詳細全文を読む スポンサード リンク
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