Rock uplift rates in South Africa from isochron burial dating of fluvial and marine terraces
Rock uplift rates in South Africa from isochron burial dating of fluvial and marine terraces
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DOI：
10.1130/g33172.1
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发表时间：
2012-11-01
期刊：
影响因子：
5.8
通讯作者：
Gibbon, Ryan J.
中科院分区：
文献类型：
--
作者：
Erlanger, Erica D.;Granger, Darryl E.;Gibbon, Ryan J.
南部非洲的高原被认为要么由于地幔驱动的动态地形而隆起，要么自中生代裂谷以来一直保持稳定。为了解决这一争论，我们根据伊丽莎白港附近周日河的长期切割率和德班附近的隆起海洋台地确定了南非的岩石隆起。我们使用等时线和简单的埋葬测年方法，用宇宙成因 Al-26 和 Be-10 对梯田进行了测年。我们发现 Sundays River 的下切深度为 16.1 +/- 1.3 m/m.y。过去大约为 4 m.y，海洋阶地产生的岩石抬升率为 9.4 +/- 2.2 m/m.y。这些结果与新近纪的快速隆升不一致。
The high plateau of southern Africa is considered to be either uplifting due to mantle-driven dynamic topography, or to have been stable since Mesozoic rifting. To address this debate, we determined rock uplift in South Africa from the long-term incision rate of the Sundays River, near Port Elizabeth, and from an uplifted marine terrace near Durban. We dated the terraces with cosmogenic Al-26 and Be-10, using both isochron and simple burial dating methods. We find that the Sundays River has incised at 16.1 +/- 1.3 m/m.y. for the past similar to 4 m.y., and the marine terrace yields a rock uplift rate of 9.4 +/- 2.2 m/m.y. These results are inconsistent with rapid Neogene uplift.