Constraining Plateau Uplift in Southern Africa by Combining Thermochronology, Sediment Flux, Topography, and Landscape Evolution Modeling
Constraining Plateau Uplift in Southern Africa by Combining Thermochronology, Sediment Flux, Topography, and Landscape Evolution Modeling
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结合热年代学、沉积物通量、地形和景观演化模型来约束南部非洲的高原隆升
DOI：
10.1029/2020jb021243
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
R. Beucher
中科院分区：
文献类型：
--
作者：
J. Stanley;J. Braun;G. Baby;F. Guillocheau;C. Robin;R. Flowers;Roderic Brown;M. Wildman;R. Beucher
南部非洲高原的平均海拔为1,000米，其隆起通常被归因于地幔过程，但对于地形发展的时间和驱动力有相互矛盾的理论。大多数高原发展史的证据来自大陆侵蚀史，海洋地层结构，或景观形态。在这里，我们使用一个景观演变模型来整合一个大型的数据集的低温热年代学，沉积物通量率周围的海洋盆地，目前的地形为南部非洲。我们探讨了三种主要的地表隆起假说：（a）南部非洲在冈瓦纳大陆解体之前的早白垩世已经隆起，（B）白垩纪中期发生的隆起和大陆倾斜，或（c）新生代中期至晚期发生的隆起。我们测试这三个间隔的高原发展是合理的，通过使用反演方法来约束的范围内的侵蚀和隆起模型参数，可以最好地再现观测数据。结果表明，四个区域的参数空间，属于两个家庭的隆起历史是最符合数据。这两个隆起家族的初始地形有限，一些地形隆起和大陆倾斜开始于1090 -100 Ma。在一个可接受的情况下，几乎所有的地形，>1,300米，是在这个时候创建的，几乎没有新生代隆起。在另一种可接受的情况下，白垩纪中期发生了400-800米的隆起，新生代中期又发生了500- 1，000米的隆起。这两个模型的情况下有不同的地球动力学的影响，我们比较地球动力学模型。
The uplift of the southern African Plateau with its average elevations of ∼1,000 m is often attributed to mantle processes, but there are conflicting theories for the timing and drivers of topographic development. Evidence for most proposed plateau development histories is derived from continental erosion histories, marine stratigraphic architecture, or landscape morphology. Here we use a landscape evolution model to integrate a large data set of low‐temperature thermochronometry, sediment flux rates to surrounding marine basins, and current topography for southern Africa. We explore three main hypotheses for surface uplift: (a) southern Africa was already elevated by the Early Cretaceous before Gondwana breakup, (b) uplift and continental tilting occurred during the mid‐Cretaceous, or (c) uplift occurred during the mid to late Cenozoic. We test which of these three intervals of plateau development are plausible by using an inversion method to constrain the range in erosional and uplift model parameters that can best reproduce the observed data. Results indicate four regions of parameter space that fall into two families of uplift histories are most compatible with the data. Both uplift families have limited initial topography with some topographic uplift and continental tilting starting at ∼90–100 Ma. In one acceptable scenario, nearly all of the topography, >1,300 m, is created at this time with little Cenozoic uplift. In the other acceptable scenario, ∼400–800 m of uplift occurs in the mid‐Cretaceous with another ∼500–1,000 m of uplift in the mid‐Cenozoic. The two model scenarios have different geodynamic implications, which we compare to geodynamic models.
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
影响因子：
2.4
作者：
Glotzbach;A Paape;J Baade;B Reinwarth;K Rowntree;J Miller
通讯作者：
J Miller
地形演化模型过程表示的反演：2. 校准和验证
DOI：
10.1029/2018jf004963
发表时间：
2020
期刊：
Journal of Geophysical Research: Earth Surface
影响因子：
--
作者：
Barnhart, Katherine R.;Tucker, Gregory E.;Doty, Sandra G.;Shobe, Charles M.;Glade, Rachel C.;Rossi, Matthew W.;Hill, Mary C.
通讯作者：
Hill, Mary C.
南部非洲对克拉通内部长期形态构造演化的看法
影响因子：
2.9
作者：
Kounov;Frimmel
通讯作者：
Frimmel