Thermal-mechanical model for crustal thickening in the central Andes driven by ablative subduction
Thermal-mechanical model for crustal thickening in the central Andes driven by ablative subduction
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DOI：
10.1130/0091-7613(1998)026
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发表时间：
1998-06
期刊：
影响因子：
5.8
通讯作者：
Daniel C. Pope;S. Willett
中科院分区：
文献类型：
--
作者：
Daniel C. Pope;S. Willett
安第斯造山带高海拔地区厚达65公里的地壳是南美洲长英质上地壳结构增厚的结果。巨大的厚度意味着数百公里的岩石圈地幔和下地壳的缩短或损失。通过对地壳增厚热过程和力学过程的数值模拟，验证了消融俯冲岩石圈-地幔剥离模型。该模型结合了关于地幔运动的运动学假设和地壳形变的动力学计算。预测包括形成一个向外生长的造山高原--类似于高原--由于高产热的上地壳的增厚，导致下地壳的高温、低粘度流动。
The thick (up to 65 km) crust of the high-elevation regions of the Andean orogenic belt results from structural thickening of the felsic upper crust of South America. The great thickness implies shortening or loss of several hundred kilometers of lithospheric mantle and lower crust. Through numerical simulation of the thermal and mechanical processes of crustal thickening, we test a model of lithospheric-mantle removal by ablative subduction. The model combines kinematic assumptions regarding mantle motion with dynamic calculations of crustal deformation. Predictions include the formation of an outwardly growing orogenic plateau—analogous to the Altiplano—that results from high-temperature, low-viscosity flow of the lower crust due to thickening of the high-heat-production upper crust.