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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Climate and tectonic controls on glaciated critical-taper orogens
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Climate and tectonic controls on glaciated critical-taper orogens

机译：冰期关键锥造山带的气候和构造控制

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In this work we present the results of a new analytical model that examines the coupling between glacial erosion and orogen development. Surface processes are assumed to be glacially dominated, and tectonic activity is controlled by critical wedge mechanics. In these circumstances, we find that orogen width is strongly dependent on both the rate of accretion and on the rate of precipitation. The orogen size is linked to tectonic and climate changes via proportionality constants: the orogen width scales with the rate of accretion to between the 2/3rd and 2nd powers, and with the rate of precipitation to the 1/3rd and 5/4th powers. The value of the proportionality constants varies with the taper angle and the relative rates of ice deformation and sliding. In all cases, the sensitivities are higher than those calculated for fluvially-eroding critical wedge orogens. Analytical solutions are supported by the results of a numerical flow-line model. The flow-line model further predicts that uplift rates will be highest at, and just below, the equilibrium line altitude. If glacial ablation is largely a calving process, rock uplift in the wedge will be strongly focused towards the toe. The predicted response time of glaciated orogens to changes in climate and tectonic forcing is dependent upon the constants of erosion, the rheology, and the rate of precipitation. These analyses predict that actual orogens have variable e-folding response times, for example approximately 1.5 Myr for the Southern Alps of New Zealand and the Olympic Mountains of Washington State, and approximately 5.5 Myr for the European Alps. (C) 2007 Elsevier B.V. All rights reserved.
机译：在这项工作中，我们提出了一个新的分析模型的结果，该模型检查了冰川侵蚀与造山带发育之间的耦合。假定地表过程以冰川为主，构造活动受关键楔形力学控制。在这些情况下，我们发现造山带的宽度强烈依赖于吸积率和降水率。造山带的大小通过比例常数与构造和气候变化相关：造山带的宽度随增积率在2/3和2次方之间成正比，与降水率在1/3和5/4次方之间成比例。比例常数的值随锥角以及冰变形和滑动的相对速率而变化。在所有情况下，灵敏度都高于对河流侵蚀的关键楔形造山带所计算的灵敏度。数值流线模型的结果为分析解决方案提供了支持。流线模型进一步预测，上升速率将在平衡线高度处最高且恰好在平衡线高度以下。如果冰川消融在很大程度上是产卵过程，则楔形物中的岩石隆起将强烈集中在脚趾上。冰川造山带对气候和构造强迫变化的预测响应时间取决于侵蚀常数，流变学和降水速率。这些分析预测实际的造山带具有不同的电子折叠响应时间，例如，对于新西兰的南阿尔卑斯山和华盛顿州奥林匹克山，大约为1.5 Myr，对于欧洲阿尔卑斯山，大约为5.5 Myr。 （C）2007 Elsevier B.V.保留所有权利。

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