Late Cenozoic evolution of the eastern margin of the Tibetan Plateau: Inferences from 40Ar/39Ar and (U-Th)/He thermochronology
Late Cenozoic evolution of the eastern margin of the Tibetan Plateau: Inferences from 40Ar/39Ar and (U-Th)/He thermochronology
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DOI：
10.1029/2000tc001246
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发表时间：
2002-02-01
期刊：
影响因子：
4.2
通讯作者：
Chen, ZL
中科院分区：
文献类型：
--
作者：
Kirby, E;Reiners, PW;Chen, ZL
[1] 中亚的高地势也许是新生代印度-亚洲碰撞的最基本表现，但对青藏高原发展的时间和速度的了解仍然难以捉摸。在这里，我们研究了毗邻四川盆地的高原东缘岩石的新生代热史，以确定该边缘的陡峭地形悬崖何时形成，根据黑云母 40Ar/39Ar 热年代学推断的温度-时间路径、碱长石 40Ar 释放光谱的多重扩散域模型以及锆石和磷灰石的 (U-Th)/He 热年代学表明，该边缘的岩石现今高原的地形前部经历了缓慢的冷却（
[1] High topography in central Asia is perhaps the most fundamental expression of the Cenozoic Indo-Asian collision, yet an understanding of the timing and rates of development of the Tibetan Plateau remains elusive. Here we investigate the Cenozoic thermal histories of rocks along the eastern margin of the plateau adjacent to the Sichuan Basin in an effort to determine when the steep topographic escarpment that characterizes this margin developed, Temperature-time paths infer-red from 40Ar/39Ar thermochronology of biotite, multiple diffusion domain modeling of alkali feldspar 40Ar release spectra, and (U-Th)/He thermochronology of zircon and apatite imply that rocks at the present-day topographic front of the plateau underwent slow cooling (