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Moho geometry beneath northern Algeria from gravity data inversion
Journal of African Earth Sciences ( IF 2.3 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.jafrearsci.2020.103851
Ahmed Ydri , Mouloud Idres , Merzouk Ouyed , Saddek Samai

Abstract The aim of this study is to provide a Moho geometry model for northern Algeria where the few studies that have been carried out concern only restricted areas. The method we used is based on the 3D inversion of the Bouguer anomaly data computed by the Bureau Gravimetrique International (BGI) from satellite data. The proposed Moho depths are roughly comparable to those obtained by previous studies conducted in the NE of Algeria, central part of the Saharan Atlas and according to a NNW-SSE profile from the coast to the Saharan platform. The results we obtained have been also compared to those from more detailed studies conducted in the Betics and Morocco, enabling us to validate the proposed model. The Moho depth accuracy which has been investigated through the variation of the density contrast and the initial depth shows a maximum error of ±2.8 km. The main results of this study indicate that the lowest Moho depth (∼11 km) is observed in the Algerian Basin and thereby the crust thickness is of about 8 km, while the highest (∼34 km) corresponds to the Saharan Atlas and the Aures and Hodna Mountains. Along the coast, the depth of the Moho is about 25 km and increases towards the south to reach 30 km at the southern boundary of the Tell Atlas. It is noteworthy to observe that the crust does not thicken under the Kabylies that would indicate that their root is not enough to isostatically support the topography.

中文翻译:

重力数据反演的阿尔及利亚北部莫霍面几何

摘要 本研究的目的是为阿尔及利亚北部提供一个莫霍面几何模型,其中少数研究仅涉及限制区域。我们使用的方法基于国际重力局 (BGI) 从卫星数据计算的布格异常数据的 3D 反演。拟议的莫霍面深度与之前在阿尔及利亚东北部、撒哈拉地图集中部以及根据从海岸到撒哈拉地台的 NNW-SSE 剖面进行的研究所获得的深度大致相当。我们获得的结果还与在 Betics 和摩洛哥进行的更详细研究的结果进行了比较,使我们能够验证所提出的模型。通过密度对比度和初始深度的变化研究的莫霍面深度精度显示最大误差为±2.8 km。本研究的主要结果表明,在阿尔及利亚盆地观测到最低的莫霍面深度(~11 km),因此地壳厚度约为 8 km,而最高的(~34 km)对应于撒哈拉阿特拉斯和 Aures和霍德纳山脉。沿着海岸,莫霍面的深度约为 25 公里,向南增加,在泰尔阿特拉斯的南部边界达到 30 公里。值得注意的是,在 Kabylies 下地壳没有变厚,这表明它们的根不足以均衡地支撑地形。本研究的主要结果表明,在阿尔及利亚盆地观测到最低的莫霍面深度(~11 km),因此地壳厚度约为 8 km,而最高的(~34 km)对应于撒哈拉阿特拉斯和 Aures和霍德纳山脉。沿着海岸,莫霍面的深度约为 25 公里,向南增加,在泰尔阿特拉斯的南部边界达到 30 公里。值得注意的是,在 Kabylies 下地壳没有变厚,这表明它们的根不足以均衡地支撑地形。本研究的主要结果表明,在阿尔及利亚盆地观测到最低的莫霍面深度(~11 km),因此地壳厚度约为 8 km,而最高的(~34 km)对应于撒哈拉阿特拉斯和 Aures和霍德纳山脉。沿着海岸,莫霍面的深度约为 25 公里,向南增加,在泰尔阿特拉斯的南部边界达到 30 公里。值得注意的是,在 Kabylies 下地壳没有变厚,这表明它们的根不足以均衡地支撑地形。
更新日期:2020-08-01
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