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Scenarios for the formation of Chasma Boreale, Mars

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タイトル: Scenarios for the formation of Chasma Boreale, Mars
著者: Greve, Ralf 著作を一覧する
キーワード: Mars
Polar cap
Chasma Boreale
Geothermal heat flux
Jökulhlaup
発行日: 2008年 8月
出版者: Academic Press
誌名: Icarus
巻: 196
号: 2
開始ページ: 359
終了ページ: 367
出版社 DOI: 10.1016/j.icarus.2007.10.020
抄録: The Martian polar caps feature large chasmata and smaller trough systems which have no counterpart in terrestrial ice sheets. Chasma Boreale cuts about 500 km into the western part of the north-polar cap, is up to 100 km wide and up to 2 km deep. One possible formation mechanism is by a temporary heat source under the ice due to tectonothermal or volcanic activity, which melts the ice from below. It is demonstrated by model simulations that this process is feasible, a moderately increased heat flux of 0.5–1Wm−2, sustained over at least tens of thousands of years, producing a topographic depression which resembles the real chasma. Associated meltwater discharge rates are small (< 1km3 a−1), but can exceed 10km3 a−1 if a stronger heat flux of 10Wm−2 is assumed. Local ice-flow velocities during the process of chasma formation can exceed 1ma−1 at the head and scarps of the chasma. However, if the thermal anomaly shuts down, glacial flow quickly decreases, so that the chasma can stay open for an indefinite amount of time without an ongoing, sustaining process under the climate conditions of the most recent millions of years.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/34403
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: Greve Ralf

 

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