B. Mali , M. Elabouyi , Y. Driouch , A. Ntarmouchant , M. Dahire , T.M. Bento dos Santos , E.M. Jeddi , H. Smaili , N. Ntarmouchant , F. Laguenini , M. Belkasmi
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The main observations show that the positive magnetic anomalies in the study area are mainly related to the magmatic activity, which was organized into two main episodes: i) Triassic, with a tholeiitic affinity, well recorded along the NE-SW inherited Variscan faults; and ii) Mio-Plio-Quaternary, with an alkaline affinity, forming scoria cones, maars, and lava flows. They are also expressed as hidden domes, laccoliths, and interconnected magma bodies revealed by 2D modelling of the aeromagnetic data. Uncommon coarse-grained undersaturated alkaline rocks crop out in Talzast dome (Talzastite, Fasinites, and Ankaratrite). They are unique in the MAVP and restricted to this part of the Middle Atlas. 2D aeromagnetic modelling has revealed the presence of shallow magmatic rocks bodies beneath Talzast dome. The extracted structural lineaments using aeromagnetic data and remote sensing reveal that the structural framework of the study area is controlled by NE-trending faults reaching depths of up to 3000 m, which is the depth of the magnetic signature of the faults. Additionally, NNE, NNW and N-trending short-length lineaments are defined and rooted at depths up to 3000 m. The predominant NE-SW structural trend may be linked to the reactivation of Hercynian faults during Alpine tectonics. These faults likely controlled the emplacement of the Mio-Plio-Quaternary volcanism in the area. The magma reservoirs that would have fed the various volcanic edifices are located at a shallow depth of less than 500–2000 m.</p></div>","PeriodicalId":14874,"journal":{"name":"Journal of African Earth Sciences","volume":"218 ","pages":"Article 105376"},"PeriodicalIF":2.2000,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Subsurface interconnection beneath the Mio-Plio-Quaternary volcanoes of the Ain Leuh causse (Middle Atlas, Morocco): Structural framework and emplacement mechanisms\",\"authors\":\"B. Mali , M. Elabouyi , Y. Driouch , A. Ntarmouchant , M. Dahire , T.M. Bento dos Santos , E.M. Jeddi , H. Smaili , N. Ntarmouchant , F. Laguenini , M. Belkasmi\",\"doi\":\"10.1016/j.jafrearsci.2024.105376\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In the Ain Leuh causse, located southwest of the Middle Atlas Volcanic Province (MAVP), a combined study using aeromagnetic data, fieldwork, and remote sensing is carried out to improve our understanding of the subsurface structure and its correlation with surface structural and volcanic features. The tectonically controlled emplacement mechanisms of the MAVP, which continue to hold undisclosed aspects, were investigated as well. Numerous techniques and mathematical filters for edge detection and 2D modelling were used. The main observations show that the positive magnetic anomalies in the study area are mainly related to the magmatic activity, which was organized into two main episodes: i) Triassic, with a tholeiitic affinity, well recorded along the NE-SW inherited Variscan faults; and ii) Mio-Plio-Quaternary, with an alkaline affinity, forming scoria cones, maars, and lava flows. They are also expressed as hidden domes, laccoliths, and interconnected magma bodies revealed by 2D modelling of the aeromagnetic data. Uncommon coarse-grained undersaturated alkaline rocks crop out in Talzast dome (Talzastite, Fasinites, and Ankaratrite). They are unique in the MAVP and restricted to this part of the Middle Atlas. 2D aeromagnetic modelling has revealed the presence of shallow magmatic rocks bodies beneath Talzast dome. 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引用次数: 0
摘要
在位于中阿特拉斯火山省(MAVP)西南部的 Ain Leuh causse,开展了一项利用航磁数据、实地考察和遥感技术的综合研究,以加深我们对地下结构及其与地表结构和火山特征之间相关性的了解。此外,还调查了受构造控制的马弗跳火山口的喷发机制,该机制仍有未被揭示的方面。使用了大量用于边缘检测和二维建模的技术和数学过滤器。主要观察结果表明,研究区域的正磁场异常主要与岩浆活动有关,岩浆活动分为两个主要阶段:i) 三叠纪,与透辉岩亲和,沿东北-西南传承的瓦里斯坎断层有详细记录;ii) 小、中、第四纪,与碱性亲和,形成焦岩锥、火山口和熔岩流。通过对航磁数据进行二维建模,它们还表现为隐藏的圆顶、裂隙岩和相互连接的岩浆体。塔尔萨斯特穹隆(塔尔萨斯特岩、法辛岩和安卡拉特岩)中出现了不常见的粗粒未饱和碱性岩。这些岩石在中阿特拉斯地区是独一无二的,而且仅限于中阿特拉斯地区的这一部分。二维航磁建模揭示了塔尔萨斯特穹隆下存在浅层岩浆岩体。利用航磁数据和遥感技术提取的结构线形显示,研究区域的结构框架受 NE 向断层控制,断层深度可达 3000 米,这也是断层磁特征的深度。此外,还确定了 NNE、NNW 和 N 走向的短线,并扎根于最深达 3000 米的地方。NE-SW 走向的主要构造趋势可能与阿尔卑斯构造期间海西断层的重新激活有关。这些断层很可能控制了该地区 Mio-Plio 第四纪火山活动的形成。为各种火山建筑物提供能量的岩浆库位于不足 500-2000 米的浅层。
Subsurface interconnection beneath the Mio-Plio-Quaternary volcanoes of the Ain Leuh causse (Middle Atlas, Morocco): Structural framework and emplacement mechanisms
In the Ain Leuh causse, located southwest of the Middle Atlas Volcanic Province (MAVP), a combined study using aeromagnetic data, fieldwork, and remote sensing is carried out to improve our understanding of the subsurface structure and its correlation with surface structural and volcanic features. The tectonically controlled emplacement mechanisms of the MAVP, which continue to hold undisclosed aspects, were investigated as well. Numerous techniques and mathematical filters for edge detection and 2D modelling were used. The main observations show that the positive magnetic anomalies in the study area are mainly related to the magmatic activity, which was organized into two main episodes: i) Triassic, with a tholeiitic affinity, well recorded along the NE-SW inherited Variscan faults; and ii) Mio-Plio-Quaternary, with an alkaline affinity, forming scoria cones, maars, and lava flows. They are also expressed as hidden domes, laccoliths, and interconnected magma bodies revealed by 2D modelling of the aeromagnetic data. Uncommon coarse-grained undersaturated alkaline rocks crop out in Talzast dome (Talzastite, Fasinites, and Ankaratrite). They are unique in the MAVP and restricted to this part of the Middle Atlas. 2D aeromagnetic modelling has revealed the presence of shallow magmatic rocks bodies beneath Talzast dome. The extracted structural lineaments using aeromagnetic data and remote sensing reveal that the structural framework of the study area is controlled by NE-trending faults reaching depths of up to 3000 m, which is the depth of the magnetic signature of the faults. Additionally, NNE, NNW and N-trending short-length lineaments are defined and rooted at depths up to 3000 m. The predominant NE-SW structural trend may be linked to the reactivation of Hercynian faults during Alpine tectonics. These faults likely controlled the emplacement of the Mio-Plio-Quaternary volcanism in the area. The magma reservoirs that would have fed the various volcanic edifices are located at a shallow depth of less than 500–2000 m.
期刊介绍:
The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa.
The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.