Sn velocity tomography beneath the Himalayan collision zone and surrounding regions
Sn velocity tomography beneath the Himalayan collision zone and surrounding regions
复制标题
喜马拉雅碰撞带及周边地区下方的锡速度层析成像
DOI：
10.5047/eps.2012.12.012
复制
发表时间：
2013-08
期刊：
影响因子：
--
通讯作者：
Shunping Pei
中科院分区：
文献类型：
--
作者：
Yan Lv;Bin Liu;Sidao Ni;Shunping Pei
本文提出了喜马拉雅碰撞带及周边地区上地幔Sn速度层析模型。在调查中总共使用了43，905个Sn相。研究区Sn的平均速度约为4.6 km/s，速度扰动达到0.2 km/s。Sn的速度分布与Pn层析成像结果一致。在印度板块、塔里木盆地和四川盆地下发现了高速度，而在缅甸地区、兴都库什地区、拉萨地块和西羌塘地块下发现了低速度。这些结果支持了印度板块岩石圈向地幔俯冲并导致热物质上涌的观点。印度板块和藏南Sn速度的东西向变化表明印度大陆岩石圈的俯冲作用可能是分段的。藏南地区地壳与上地幔热结构的差异表明，该地区可能具有壳热幔冷的构造模式，支持了该地区可能存在地壳物质流的观点。
We present a tomographic Sn velocity model of the uppermost mantle beneath the Himalayan collision zone and surrounding regions. A total of 43,905 Sn phases are used in the investigation. The average Sn velocity in the study area is approximately 4.6 km/s, and the velocity perturbations reach 0.2 km/s. The Sn velocity distribution is consistent with Pn tomography results obtained previously. High velocities are found under the Indian plate, the Tarim Basin, and the Sichuan Basin, whereas low Sn velocities are found beneath the Myanmar region, the Hindu-Kush region, and the Lhasa block and western Qiangtang block. These results support the idea that the lithosphere of the Indian plate is subducted into the mantle and causes the upwelling of hot material. The east-west variability of the Sn velocity beneath the Indian plate and southern Tibet indicates that the underthrusting of the Indian continental lithosphere may be in a piecewise manner. The differences between the thermal structure of the crust and upper mantle in southern Tibet suggest that this region may be represented by a tectonic model of hot crust and cold mantle, supporting the idea that crustal material flow may occur in this region.
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