Abstract We present high-resolution receiver function images along a 700-km long dense seismic array extending from northern Tibetan Plateau to the Alxa block, crossing the entire Qilian thrust belt (QTB). The dense stations, with less than ~2 km station intervals, allow the receiver functions to unveil unprecedented details of crustal structures across the northern frontier of the growing Tibetan Plateau. The migration image shows a thickened and strongly deformed QTB crust, with an uneven Moho and complex internal structures that are indicative of pure-shear shortening. The Alxa block, in contrast, has a thinner crust, a flat Moho, and little internal crustal deformation. These results suggest that the lateral growth of NE Tibetan Plateau is restricted by the strong Asian lithosphere, which shows no visible subduction beneath the Tibetan Plateau as previously suggested.

中文翻译：

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受亚洲岩石圈限制的青藏高原东北部的横向生长：来自密集地震剖面的结果

摘要 我们沿着从青藏高原北部延伸到阿拉善地块、跨越整个祁连冲断带（QTB）的 700 公里长的密集地震阵列呈现高分辨率接收函数图像。密集的站点，站点间隔不到约 2 公里，允许接收器功能揭示跨越不断增长的青藏高原北部边界的地壳结构的前所未有的细节。迁移图像显示了加厚和强烈变形的 QTB 地壳，具有不均匀的莫霍面和复杂的内部结构，表明纯剪切缩短。相比之下，阿拉善地块的地壳更薄，莫霍面平坦，地壳内部变形很小。这些结果表明青藏高原东北部的横向生长受到亚洲强岩石圈的限制，