Post-Miocene landscape rejuvenation at the eastern end of the Alps

Post-Miocene landscape rejuvenation at the eastern end of the Alps
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阿尔卑斯山东端的后中新世景观复兴

DOI:
10.1130/l391.1
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发表时间:
2015
期刊:
影响因子:
2.4
通讯作者:
von Blanckenburg
von Blanckenburg
中科院分区:
地球科学3区
文献类型:
--
作者:
Legrain;Stüwe;von Blanckenburg

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在关于阿尔卑斯山隆起和景观演变原因的争论中,大多数研究都集中在过去200万年在某个阶段被冰川覆盖的地区。在这些地区,很难区分冰川驱动的侵蚀率和构造驱动的侵蚀率。在这里,我们展示了阿尔卑斯山东端科拉尔佩山脉未结冰集水区的10 Be推导出的侵蚀率。这一地区具有强大的地貌证据景观短暂与年轻的山谷切割成一个光滑的遗迹景观。侵蚀速率平均为49 ± 8 mm/k.y.位于残遗景观上的集水区为137 ± 15 mm/k.y.切割景观中的集水区。根据这些数据,我们估计切割开始于4 ± 1 Ma,地表抬升350 ± 90 m,总相对基准面下降540 ± 140 m。我们的研究结果是在密切的一致性的幅度和年龄开始隆起的施蒂里亚盆地和北方磨拉石盆地,以及切割率的穆尔河到施蒂里亚喀斯特。推断的时间约4马隆起的发病与解释盆地反转在潘诺尼亚盆地。由于这一隆升事件似乎涉及潘诺尼亚盆地和整个阿尔卑斯山脉的东端,我们认为,它可能发生在岩石圈的深层过程。因此,我们认为,构造驱动器后中新世隆升在阿尔卑斯山东部。
In the debate on the causes of uplift and landscape evolution of the Alps, most studies focus on regions that were glaciated at some stage during the last 2 m.y. In these areas, it is difficult to separate glacial-driven versus tectonically driven rates of erosion. Here, we present10Be-derived erosion rates from unglaciated catchments in the Koralpe range at the eastern end of the Alps. This region features strong geomorphologic evidence for landscape transience with young valleys incised into a smooth relict landscape. Erosion rates average 49 ± 8 mm/k.y. for catchments located on the relict landscape and 137 ± 15 mm/k.y. for catchments in the incised landscape. From these data, we estimate the onset of incision at 4 ± 1 Ma, the surface uplift at 350 ± 90 m, and a total relative base-level fall of 540 ± 140 m. Our results are in close agreement with both the magnitude and the age of onset of uplift of the Styrian Basin and the northern Molasse Basin, as well as the incision rate of the Mur River into the Styrian karst. The inferred timing of the onset of uplift around 4 Ma relates to interpreted basin inversion in the Pannonian Basin. Since this uplift event appears to have involved both the Pannonian Basin and the entire eastern end of the Alpine mountain range, we suggest that it may have occurred in response to a deep-seated process in the lithosphere. As such, we argue for tectonic drivers for the post-Miocene uplift in the eastern Alps.
DOI: 10.1130/l307.1
发表时间: 2014-04-01
期刊: LITHOSPHERE
影响因子: 2.4
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发表时间: 2012
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发表时间: 1995
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发表时间: 2005
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