Uplift of the West Kunlun Range, northern Tibetan Plateau, dominated by brittle thickening of the upper crust
Uplift of the West Kunlun Range, northern Tibetan Plateau, dominated by brittle thickening of the upper crust
复制标题
青藏高原北部西昆仑隆起，上地壳脆性增厚为主
DOI：
10.1130/g33890.1
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发表时间：
2013-04-01
期刊：
影响因子：
5.8
通讯作者：
Li, Haibing
中科院分区：
文献类型：
--
作者：
Jiang, Xiaodian;Li, Zheng-Xiang;Li, Haibing
西昆仑山前缘高分辨率地震反射资料表明，青藏高原西北缘地壳结构以上地壳岩石推覆体为主。地质剖面平衡表明，上地壳平均缩短24.6-54公里（38%-52%）。上地壳脆性褶皱和断层作用造成的水平缩短与地壳增厚、莫霍面深度增加5-7 km以及地形正相关。研究表明，上地壳缩短是青藏高原西北缘地形隆升和地壳增厚的主要因素。这种机制与卡拉喀什走滑断层以南高原的机制不同，在卡拉喀什走滑断层以南的高原，地壳流动可能在高原隆升中发挥了重要作用。
High-resolution seismic reflection data from the West Kunlun Range front show that crustal structures beneath the northwestern margin of the Tibetan Plateau are dominated by nappes of upper crustal rocks. Geological cross-section balancing suggests an average of 24.6–54 km (38%–52%) of upper crustal shortening. This horizontal shortening by brittle folding and faulting in the upper crust correlates positively with crustal thickening, an increase in Moho depth by 5–7 km, and the topography. Our work suggests that upper crustal shortening is a chief factor for topographic uplift and crustal thickening at the northwestern margin of the Tibetan Plateau. Such a mechanism is different from that proposed for the plateau south of the Karakax strike-slip fault, where crustal flow may have played a prominent role in plateau uplift.