老造山带-年轻地形:欧洲瓦立斯坎带晚新生代隆升样式及发掘特征

IF 3.1 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Fabian Dremel , Jörg Robl , Stefan Hergarten , Nicolas Villamizar-Escalante , Bjarne Friedrichs , Christoph von Hagke
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引用次数: 0

摘要

自中新世以来,中欧瓦里斯坎造山带的露头残余物经历了浮雕复兴。尽管在二叠纪时被夷平,且远离活动板块边界,但一些现代瓦里斯坎地块仍以山地地形为特征。重新隆起产生了超过1000米的平均海拔高度,这可归因于地幔柱、大陆裂谷和岩石圈屈曲等板内作用。然而,由于相互矛盾的数据,包括低隆升率的高海拔地区,低侵蚀率的陡峭河流剖面,以及超过200 Ma的冷却年龄,限制这些机制仍然具有挑战性。本研究探讨了与地幔相关过程相关的独特地形和侵蚀特征。我们将造山带范围的形态计量学分析与来自低温热年代学的短期流域范围侵蚀率和长期挖掘率的新汇编结合起来。这些结果与一种包含弯曲均衡的新型一维景观演化模型的预测相对照。我们的研究结果表明,每个地球动力学过程(即地幔柱和裂陷)的地形表达以及侵蚀和剥蚀模式都是独特的,可以作为解释和表征潜在地质驱动因素的替代指标。地幔柱形成边缘高侵蚀率的圆顶状地形和低起伏、低侵蚀率的中央地表,而地堑沉降伴随着明显的不对称裂谷两侧的隆升,这反映在空间变化的侵蚀率和分水岭的不稳定性上。我们的分析表明,这些固有的短暂景观不同于碰撞造山带,限制了这些非造山带直接从早产过渡到衰变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Old orogen - young topography: Characterizing styles of late Cenozoic uplift and exhumation in the European Variscan belt
Outcropping remnants of the Variscan orogen in Central Europe have experienced relief rejuvenation since the Miocene. Several modern Variscan massifs feature mountainous topography although they were leveled in the Permian and are far from active plate boundaries. Renewed uplift created mean elevations exceeding 1000 m and is attributed to intraplate processes such as mantle plumes, continental rifting, and lithospheric buckling. However, constraining these mechanisms remains challenging due to conflicting data, including high elevations with low uplift rates, steep river profiles with low erosion rates, and cooling ages exceeding 200 Ma.
This study investigates the unique topographic and erosional signatures associated with mantle-related processes. We combine orogen-wide morphometric analyses with new compilations of short-term catchment-wide erosion rates and long-term exhumation rates from low-temperature thermochronology. These results are tested against predictions from a novel 1D landscape evolution model incorporating flexural isostasy.
Our findings reveal that topographic expressions, but also erosional and denudational patterns are unique for each geodynamic process (i.e., mantle plume and rifting) and can be used as proxies to decipher and characterize the underlying geological drivers. Whereas mantle plumes induce a dome-shaped topography with high erosion rates at the margins and a low-relief, low erosion rate central surface, graben subsidence is accompanied by the uplift of pronounced asymmetric rift flanks, which is reflected in spatial variable erosion rates and drainage divide instability. Our analyses show that these inherently transient landscapes differ from collisional orogens, restricting these non-orogenic mountain ranges to transition directly from prematurity to decay.
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来源期刊
Geomorphology
Geomorphology 地学-地球科学综合
CiteScore
8.00
自引率
10.30%
发文量
309
审稿时长
3.4 months
期刊介绍: Our journal''s scope includes geomorphic themes of: tectonics and regional structure; glacial processes and landforms; fluvial sequences, Quaternary environmental change and dating; fluvial processes and landforms; mass movement, slopes and periglacial processes; hillslopes and soil erosion; weathering, karst and soils; aeolian processes and landforms, coastal dunes and arid environments; coastal and marine processes, estuaries and lakes; modelling, theoretical and quantitative geomorphology; DEM, GIS and remote sensing methods and applications; hazards, applied and planetary geomorphology; and volcanics.
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