Links between climate, erosion, uplift, and topography during intracontinental mountain building of the Hangay Dome, Mongolia
Links between climate, erosion, uplift, and topography during intracontinental mountain building of the Hangay Dome, Mongolia
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DOI：
10.1002/2013gc004859
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发表时间：
2013-12
期刊：
影响因子：
3.7
通讯作者：
A. West;M. Fox;R. Walker;A. Carter;T. Harris;A. Watts;B. Gantulga
中科院分区：
文献类型：
--
作者：
A. West;M. Fox;R. Walker;A. Carter;T. Harris;A. Watts;B. Gantulga
Hangay山脉是蒙古中部的一个圆顶，为了解气候如何影响侵蚀以及由此产生的大陆地形地貌和沉积特征提供了一个窗口。具体而言，不对称侵蚀的Hangay，与一个独特的地形降水梯度，提供了一个自然的实验，探索隆起，侵蚀，和均衡响应侵蚀卸载。平顶的汉盖峰保留了低起伏的残余表面，这些表面提供了岩石隆起的标志。这使得有可能映射在拱起过程中以前的平面表面的变形，从而通过与现今地形的差异来估计侵蚀的总范围。侵蚀进入Hangay表面已经显着，但不完整的;该范围的形态表明，可能已经持续了数百万至数千万年的非平衡景观，这意味着在这种半干旱气候的反应时间很长。整个山脉的侵蚀程度与平均年降水量相关。现今山峰高度在南北气候和侵蚀梯度上的变化为普遍接受的理论提供了经验支持，即气候驱动的侵蚀将通过等熵线产生更大的表面隆起来增加山峰的高度。对这种均衡响应的校正使得重建汉盖的主要地表隆起成为可能。结果突出了考虑气候，侵蚀和隆起之间的相互作用的重要性，在塑造陆内地形，从而解释地貌，沉积和地球动力学的签名与这种地形。
The Hangay mountain range, a dome in central Mongolia, provides a window into understanding how climate influences the erosion and resulting geomorphic and sedimentary signatures of continental topography. Specifically, asymmetric erosion of the Hangay, associated with a distinct orographic precipitation gradient, offers a natural experiment for exploring uplift, erosion, and the isostatic response to erosional unloading. The flat‐topped Hangay peaks preserve low‐relief remnant surfaces that provide markers of rock uplift. This makes it possible to map the deformation of a former planar surface during doming and hence to estimate the total extent of erosion by the difference from present day topography. Erosion into the Hangay surface has been significant but incomplete; the morphology of the range indicates a nonequilibrium landscape that may have persisted for millions to tens of millions of years, implying a long response time in this semiarid climate. The extent of erosion across the range correlates with mean annual precipitation. Variability in present‐day peak heights across the north‐south climatic and erosional gradient provides empirical support for the generally accepted theory that climate‐driven erosion will increase the height of mountain peaks by generating greater surface uplift through isostasy. Correction for this isostatic response makes it possible to reconstruct primary surface uplift of the Hangay. Results highlight the importance of considering the interplay between climate, erosion, and uplift in shaping intracontinental topography and thus when interpreting the geomorphic, sedimentary, and geodynamic signatures associated with such topography.