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首页> 外文期刊>South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika >Present denudation rates at selected sections of the South African escarpment and the elevated continental interior based on cosmogenic He-3 and Ne-21
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Present denudation rates at selected sections of the South African escarpment and the elevated continental interior based on cosmogenic He-3 and Ne-21

机译：基于宇宙成因的He-3和Ne-21，南非悬崖某些部分和大陆内部高架的当前剥蚀率

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摘要

Measurements of cosmogenic He-3 and Ne-21 concentrations in dolerite and quartzite samples front selected sites across the South African coastal escarpment and the interior plateau provide valuable estimates of the short-term (i.e., a few hundred thousand years) denudation rates. Present-day denudation rates at the summit of the escarpment and on the inland plateau are more than an order of magnitude lower than those in the Cretaceous. Values between 1.0 and 2.1 m/Ma obtained from resistant quartzite samples and between 1.5 and 3 m/Ma from dolerite sills suggest a strong lithology control on the erosion. The observed patterns of denudation across different landform sites on the high plateau and along its flanking escarpment suggest that the morphology of the sampling sites together with the local climate conditions have controlled the denudation processes.
机译：白云母和石英岩样品中宇宙成因的He-3和Ne-21浓度的测量跨南非沿海悬崖和内陆高原的选定地点，为短期（即几十万年）剥蚀率提供了有价值的估计。如今，悬崖顶和内陆高原的剥蚀率比白垩纪的剥蚀率低一个数量级。从抗性石英岩样品获得的值介于1.0和2.1 m / Ma之间，从白云石基岩获得的值介于1.5和3 m / Ma之间，这表明对侵蚀作用具有很强的岩性控制能力。在高原上不同的地貌站点及其侧翼悬崖上观察到的剥蚀模式表明，采样点的形态以及当地的气候条件已经控制了剥蚀过程。

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