Climate as the Great Equalizer of Continental‐Scale Erosion
Climate as the Great Equalizer of Continental‐Scale Erosion
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DOI：
10.1029/2021gl095008
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发表时间：
2021-10
影响因子：
5.2
通讯作者：
G. Jepson;B. Carrapa;J. Gillespie;R. Feng;P. DeCelles;P. Kapp;C. Tabor;Jiang Zhu
中科院分区：
文献类型：
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作者：
G. Jepson;B. Carrapa;J. Gillespie;R. Feng;P. DeCelles;P. Kapp;C. Tabor;Jiang Zhu
中亚地区是地球上地形最广、最高的地区，是岩石隆升、大气环流和水汽输送以及侵蚀相互作用的结果。在这里，我们分析了2，511个已发表的低温热年代学年龄，作为中亚区域尺度侵蚀的代理。我们将这些年龄与构造和气候代理进行比较，以及最先进的古气候模拟，以限制气候和构造对中亚地形结构的影响。我们观察到高降水地区较年轻的冷却年龄与受降水保护的地区较老的年龄（中生代）之间的一阶关系，尽管应变率很高。因此，我们认为，在岩石隆起产生显著的地形梯度的地区，气候增强了侵蚀，而在大陆内部，构造活动但没有明显降水的地区记录了更老的年龄和更长的侵蚀历史。
Central Asia hosts the most extensive and highest topography on Earth, which is the result of the feedbacks among rock uplift, atmospheric circulation and moisture transport, and erosion. Here, we analyze 2,511 published low‐temperature thermochronometric ages as a proxy of the regional‐scale erosion of Central Asia. We compare these ages to tectonic and climate proxies, and state‐of‐the‐art paleoclimate simulations to constrain the influences of climate and tectonics on the topographic architecture of Central Asia. We observe a first‐order relationship between younger cooling ages in areas of high precipitation and older ages (Mesozoic) in areas that have been sheltered from precipitation, despite high strain rates. Thus, we suggest that climate enhances erosion in areas where rock uplift produces significant orographic gradients, whereas in the continental interior, areas which are tectonically active but have been sheltered from significant precipitation record older ages and a longer erosional history.