The Qilian Shan is a reactivated fold‐thrust belt at the northeastern margin of the Tibetan Plateau (TP). The initiated timing of the Qilian Shan's tectonic response to Indian‐Asian plate convergence has significant implications for our understanding of the growth of the TP, yet remains a controversial topic. We conducted apatite fission track analyses of the Cenozoic synorogenic sediments in the Subei Basin on the northwestern flank of the Qilian Shan to investigate the time of initial Qilian Shan deformation during the Cenozoic. An integration of new and existing detrital apatite fission track ages indicates that terranes in the Qilian Shan experienced a prominent tectonic exhumation event at ~60–50 Ma. This result suggests that tectonism initiated on the northeastern margin of the TP nearly simultaneously with the India‐Asia collision.

中文翻译：

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青藏高原东北缘祁连山早期新生代发掘：碎屑磷灰石裂变径迹热年代学的启示

祁连山是青藏高原东北缘的一次活化的褶皱冲断带。祁连山对印度－亚洲板块汇聚的构造响应的开始时间，对我们对TP的增长的理解具有重要意义，但仍然是一个有争议的话题。我们对祁连山西北侧苏北盆地新生代共生沉积物进行了磷灰石裂变径迹分析，以研究新生代初期祁连山初始变形的时间。新的和现有的碎屑磷灰石裂变径迹年龄的综合表明，祁连山地体在〜60–50 Ma经历了一次重要的构造掘尸事件。这一结果表明，构造运动几乎是在印度—亚洲碰撞的同时在TP的东北边缘开始的。