Late Pleistocene – Holocene denudation, uplift, and morphology evolution of the Armorican Massif (western Europe)

IF 2.8 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Oswald Malcles, Stéphane Mazzotti, Philippe Vernant, Vincent Godard
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Abstract

Abstract. Elevated Plio-Pleistocene coastal and marine markers in stable continental regions are commonly explained by a combination of eustatic sea-level variations and regional geodynamics (e.g., mantle dynamics, active faults). In this study, we test the role of erosion rates on the Late Pleistocene uplift and landform evolution of the Armorican Massif, western France. Denudation rates are estimated for 19 drainage basins using terrestrial cosmogenic nuclide (10Be) measurements in quartz. They range between 3 and 34 m.Ma-1, with a factor of two difference between the western highland region and the central lowland region (16 ± 8 m.Ma-1 vs. 9 ± 6 m.Ma-1). Assuming a thin elastic plate model, the lithosphere flexural isostatic response to these denudation rates produces an overall uplift of the Armorican Peninsula from 12 – 15 m.Ma-1 in the central lowland region to 4 – 10 m.Ma-1 in the western peninsula and along the coastline. We show that these erosion-driven uplift rates can explain the uplifted Late Pleistocene marine terraces along the Armorican Peninsula coastline as well as the elevated Quaternary marine deposits in the central lowland region, without necessitating additional geodynamic processes such as regional compression or local active faults. Our results suggest that, in stable continental regions, long-term erosion should be taken into account as a driver of uplift and deformation before trying to derive global or regional geodynamic or tectonic conclusions.
晚更新世-全新世阿莫里卡地块(西欧)的剥蚀、隆升和形态演化
摘要。稳定大陆区域上新世-更新世海岸和海洋标志的升高通常由海平面上升变化和区域地球动力学(如地幔动力学、活动断层)的结合来解释。在这项研究中,我们测试了侵蚀速率在法国西部阿莫里卡地块晚更新世隆升和地貌演化中的作用。利用地球宇宙成因核素(10Be)测量石英,估计了19个流域的剥蚀速率。它们的长度在3到34米之间。Ma-1,西部高原区与中部低地区相差2个因子(16±8 m)。Ma-1 vs. 9±6 Ma-1)。假设一个薄弹性板块模型,岩石圈对这些剥蚀速率的弯曲均衡反应产生了美洲半岛从12 - 15米的整体隆起。马-1在中部低地地区可达4 - 10米。马-1位于西部半岛和沿岸。研究表明,这些侵蚀驱动的抬升速率可以解释美国半岛沿岸晚更新世海相阶地的抬升,以及中央低地地区第四纪海相沉积的抬升,而不需要额外的地球动力学过程,如区域压缩或局部活动断层。我们的研究结果表明,在稳定的大陆区域,在试图得出全球或区域地球动力学或构造结论之前,应考虑长期侵蚀作为隆升和变形的驱动因素。
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来源期刊
Earth Surface Dynamics
Earth Surface Dynamics GEOGRAPHY, PHYSICALGEOSCIENCES, MULTIDISCI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
5.40
自引率
5.90%
发文量
56
审稿时长
20 weeks
期刊介绍: Earth Surface Dynamics (ESurf) is an international scientific journal dedicated to the publication and discussion of high-quality research on the physical, chemical, and biological processes shaping Earth''s surface and their interactions on all scales.
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