Denudation rates for the southern Drakensberg escarpment, SE Africa, derived from in-situ-produced cosmogenic 36C1: initial results
Denudation rates for the southern Drakensberg escarpment, SE Africa, derived from in-situ-produced cosmogenic 36C1: initial results
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DOI：
10.1144/gsjgs.156.2.0209
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发表时间：
1999-03
影响因子：
2.7
通讯作者：
A. Fleming;M. Summerfield;J. Stone;L. Fifield;R. Cresswell
中科院分区：
文献类型：
--
作者：
A. Fleming;M. Summerfield;J. Stone;L. Fifield;R. Cresswell
宇宙成因36 C1浓度玄武岩样品从德拉肯斯堡悬崖东南非洲被动边缘剥蚀和悬崖退缩率的定量估计。在104-106年的时间跨度解决了这些数据，计算的悬崖退缩率为50-95米马-1和平均高峰剥蚀率6米马-1。陡坎后退速率比先前提出的要小一个数量级。山顶下降的速度足以阻止以前推断该地区中生代形成的侵蚀循环表面的长期完整生存。
Cosmogenic 36C1 concentrations in basalt samples from the Drakensberg escarpment on the SE African passive margin give quantitative estimates of denudation and scarp retreat rates. Over the 104–106 year timespan addressed by these data, the calculated escarpment retreat rate has been 50–95 m Ma-1 and the average summit denudation rate 6 m Ma-1. The scarp retreat rate is an order of magnitude less than previously suggested. The rate of summit lowering is sufficient to prevent the long-term intact survival of erosion cycle surfaces formed in the Mesozoic that were previously inferred for this region.