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Title :Numerical simulation of a Himalayan profile
Authors :Hayashi, Daigoro
Talbot, Christopher
Authors alternative :林, 大五郎
Issue Date :1991
Abstract :Six numerical models exploring the dynamics of the front ranges in a N-S profile through a biaxial Himalayan collision orogeny are described and assessed. A 4000m high "Tibetan Plateau" with a 3000m deep foredeep is simulated in only "100,000 years" by shortening 200km of a front of an extending Newtonian "India". The Newtonian "sialic crust" is deformed by a 60km deep ramp dipping 45 degrees northwards in a rigid "mantle asthenosphere" moving "northwards" at 10cm/ year. A foredeep subsides above the ramp because the northern part of Newtonian "India" can not keep up with the rise of the "Himalayan front" . A soft, low-density region inserted above the rigid ramp rises so slowly that it makes little difference to the surface topography. A larger soft, low-density inclusion in front of the ramp simulates the "High Himalaya" despite not having time to become diapiric. Restricting the area analysed by finite elements to only about 0.1 the width of the "Tibetan Plateau" means that the restricted plateau rises about 10 times faster than a full-width equivalent. This biases the progressive deformation of surface relief far more than its dissipation by gravity spreading (i. e. isostatic compensation is confined to the viscous crust). Various improvements to the model are suggested.
Type Local :雑誌掲載論文
Publisher :中川久夫教授退官記念事業会
URI :http://hdl.handle.net/20.500.12000/2931
Citation :地質学論文集 : 中川久夫教授退官記念 p.53 -63
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Science)

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