Relative landscape maturity in the South Rifian Ridges (NW Morocco): Inferences from DEM-based surface indices analysis

Relative landscape maturity in the South Rifian Ridges (NW Morocco): Inferences from DEM-based surface indices analysis
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南里夫山脊(摩洛哥西北部)的相对景观成熟度:基于 DEM 的表面指数分析的推论

DOI:
10.1016/j.acags.2020.100027
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Habibi M.
Habibi M.
中科院分区:
--
文献类型:
--
作者:
El Ouardi;Zebari;El Makrini;Habibi M.

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本文首次对直布罗陀弧(摩洛哥)南部分支的南里菲安脊进行了景观成熟度分析。晚中新世以来,努比亚板块与欧亚板块的辐合推动背斜构造向南扩展,导致南里夫走廊的关闭和裂谷科迪勒拉的持续运动。到目前为止,人们对这些脊的相对活动和现今的演化知之甚少。利用dem的地貌指数,我们评估了穆莱-伊德里斯地块背斜的相对活动性,以区分最近的构造;对裂谷褶皱冲断带前缘第四纪演化有更清晰的认识。我们使用了一些指标,包括Hypsometric Integral (HI), Surface Roughness (SR)以及它们的组合,Surface Index (SI),来突出凸起的表面和侵蚀不连续面。对河流的归一化陡峭指数(Ksn)进行评估,以检测来自排水网络分析的垂直位移。分析地形带剖面以突出高架和高度解剖的区域。相对景观成熟度分析表明,整个地块在同一时间开始隆升,并表现出景观成熟度的变化,以响应不同的挖掘速率,从东到西北(在Fert El Bir背斜)增加。这些差异导致了构造控制的变化,这种变化可能受到深层盐层的有利影响,并受到近期板块缩短期的刺激。
In this paper we present the first landscape maturity analysis of the South Rifian Ridges, part of the southern branch of Gibraltar Arc (Morocco). Since the late Miocene, the southward propagation of anticlines structures is driven by the convergence between the Nubia and Eurasia plates, leading to the closure of the South Rifian Corridor and the ongoing motion of the Rif cordillera. So far little is known about the relative activity and the present-day evolution of the ridges. By using DEM-based geomorphic indices, we assessed the relative activity of the Moulay Idriss Massif anticlines to distinguish the most recent structures; and to have a clearer insight on the Quaternary evolution in the front of Rif fold-thrust belt. We used indices including the Hypsometric Integral (HI), Surface Roughness (SR) and their combination, Surface Index (SI), to highlight raised surfaces and erosional discontinuities. The normalized steepness index (Ksn) for the streams is evaluated to detect vertical displacements from the drainage network analysis. The topographic swath profiles are analyzed to highlight elevated and highly dissected areas. The relative landscape maturity analysis suggests that the entire massif has started to uplift at the same time and it exhibits a variation in landscape maturity in response to differential rates of exhumation, which increase from the east to the northwest (in Fert El Bir anticline). These differences resulted in variations in structural control that might be favored by salt layer at depth and stimulated by recent plate’s shortening phases.
DOI: 10.5194/se-10-663-2019
发表时间: 2019-05
期刊: Solid Earth
影响因子: 3.4
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发表时间: 2003-04-10
期刊: NATURE
影响因子: 64.8
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