Cenozoic landscape evolution of the Kruger National Park as derived from cosmogenic nuclide analyses

Cenozoic landscape evolution of the Kruger National Park as derived from cosmogenic nuclide analyses
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来自宇宙成因核素分析的克鲁格国家公园新生代景观演化

DOI:
10.1111/ter.12223
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发表时间:
2016
期刊:
影响因子:
2.4
通讯作者:
J Miller
J Miller
中科院分区:
地球科学3区
文献类型:
--
作者:
Glotzbach;A Paape;J Baade;B Reinwarth;K Rowntree;J Miller

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与活跃的构造环境相反,人们对构造不活跃地区地表过程与气候变化之间的潜在反馈知之甚少。在这里,我们使用宇宙成因核素测年法研究了南非克鲁格国家公园侵蚀和景观演变的驱动力。(~2和~10 mm ka−1)与南非其他地方的侵蚀和岩石隆起程度相似,这表明(1)岩石隆起仅仅是对侵蚀的均衡反应,(2)一级地形可能是白垩纪。抗侵蚀岩石的广泛暴露促进了地形的成熟。然而,我们的数据表明,当地的岩石阻力的变化导致短暂的景观变化,与当地增加的救济和侵蚀率。
In contrast to active tectonic settings, little is known about the potential feedback between surface processes and climate change in tectonically inactive cratonic regions. Here, we studied the driving forces of erosion and landscape evolution in the Kruger National Park in South Africa using cosmogenic nuclide dating.10Be‐derived catchment‐wide erosion rates (~2 and ~10 mm ka−1) are similar in magnitude to erosion and rock uplift elsewhere in South Africa, suggesting that (1) rock uplift is solely the isostatic response to erosion and (2) the first‐order topography is likely of Cretaceous age. The topographic maturity is promoted by widespread exposure of rocks resistant to erosion. Our data, however, suggest that local variations in rock resistance lead to transient landscape changes, with local increases in relief and erosion rates.
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