Reconstruction of the deformed collision zone Between India and Asia by backward motion of lithospheric blocks
Reconstruction of the deformed collision zone Between India and Asia by backward motion of lithospheric blocks
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DOI：
10.1029/2001jb000661
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发表时间：
2003-06
影响因子：
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通讯作者：
A. Replumaz;P. Tapponnier
中科院分区：
文献类型：
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作者：
A. Replumaz;P. Tapponnier
[1]基于印度 - 亚洲碰撞的构造数据的综合，我们提出了重建碰撞区的演变的首次尝试，假设岩石圈的变形沿狭窄的剪切区和岩石圈定位。地幔块的内部仍然相对不符合，我们从故障模式定义了块轮廓，并沿着边界断层向后移动。逐步缩短或延伸，我们会及时返回，以最终到达碰撞在整个碰撞区域的规模上搜索兼容性，可以用更少的数据来求解区域的运动学，并建议对每个步骤都缺乏数据的区域。位移图，并确定最新时间步长的欧拉杆。但是随着时间的变化，在不同时期的收敛量只有3％或60％。
[1] On the basis of a synthesis of tectonic data available on the India-Asia collision, we present a first attempt to reconstruct the evolution of the collision zone. Assuming that the deformation of the lithosphere is localized along narrow shear zones and that the interiors of mantle blocks in between remain relatively undeformed, we define block contours from the fault pattern and move back the blocks along their boundary faults. Along convergent or extensional boundaries, the crust is assumed to shorten or stretch coherently. Step-by-step, we go backward in time to finally reach the collision onset. For each time step, we find a solution compatible with the data set available and the position of the adjacent blocks for each block. The search for compatibility at the scale of the entire collision zone allows for solving the kinematics of regions with fewer data and suggests plausible scenarios for regions where data is lacking. For each step, we calculate large-scale displacement maps, and determine Euler poles for each block. For the most recent time step, the map proposed is compared to GPS motions. The deformation budget implies that extrusion absorbed ∼30% of the convergence between India and Siberia during the entire collision span, but varied with time, accounting for as little as 3% or as much as 60% of this convergence at different epochs.