Lower crust indentation or horizontal ductile flow during continental collision
Lower crust indentation or horizontal ductile flow during continental collision
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DOI：
10.1016/j.tecto.2004.06.012
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发表时间：
2004-08
期刊：
影响因子：
2.9
通讯作者：
M. Gerbault;E. Willingshofer
中科院分区：
文献类型：
--
作者：
M. Gerbault;E. Willingshofer
利用高岭山型大陆碰撞的二维热力学模型研究了凹痕和沟槽流动的条件。这些模型模拟了一个造山带在150公里宽的弱化岩石圈初始中心部分的发展，与几次地质重建相一致。我们特别研究了低地壳强度在以1厘米/年的速度缩短20 Ma后形成特殊几何形状的作用。地壳层产生了叠瓦状层的几何形状，这是由两种截然不同的机制造成的，一种是水道化的韧性横向流动，另一种是水平的刚性压痕。
Conditions for indentation and channelised flow are investigated with two-dimensional thermomechanical models of Alpine-type continental collision. The models mimic the development of an orogen at an initial central portion of weakened lithosphere 150 km wide, coherent with several geological reconstructions. We study in particular the role of lower crustal strength in developing peculiar geometries after 20 Ma of shortening at 1 cm/year. Crustal layers produce geometries of imbricate layers, which result from two contrasted mechanisms of either channelised ductile lateral flow or horizontal rigid-like indentation: