Physical volcanology and emplacement mechanism of the Central Atlantic Magmatic Province (CAMP) lava flows from the Central High Atlas, Morocco
The best preserved and most complete lava flow sequences of the Central Atlantic Magmatic Province (CAMP) in Morocco are exposed in the Central High Atlas and can reach up to 300 m in thickness. Four distinct formations, emplaced in subaerial environments, are classically recognized: the Lower, Inte...
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| Format: | Article |
| Language: | English |
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Académie des sciences
2020-07-01
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| Series: | Comptes Rendus. Géoscience |
| Subjects: | |
| Online Access: | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.7/ |
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| author | El Hachimi, Hind Youbi, Nasrrddine Madeira, José Marzoli, Andrea Mata, João Bertrand, Hervé Bensalah, Mohamed Khalil Boumehdi, Moulay Ahmed Doblas, Miguel Medina, Fida Ben Abbou, Mohamed Martins, Línia |
| author_facet | El Hachimi, Hind Youbi, Nasrrddine Madeira, José Marzoli, Andrea Mata, João Bertrand, Hervé Bensalah, Mohamed Khalil Boumehdi, Moulay Ahmed Doblas, Miguel Medina, Fida Ben Abbou, Mohamed Martins, Línia |
| author_sort | El Hachimi, Hind |
| collection | DOAJ |
| description | The best preserved and most complete lava flow sequences of the Central Atlantic Magmatic Province (CAMP) in Morocco are exposed in the Central High Atlas and can reach up to 300 m in thickness. Four distinct formations, emplaced in subaerial environments, are classically recognized: the Lower, Intermediate, Upper and Recurrent formations. These formations are separated by paleosoils and sedimentary sequences (mudstones, siltstones, sandstones, limestones), that are in general less than two meter-thick and may exceptionally reach a thickness of 80 m, representing minor periods of volcanic quiescence. CAMP lava flows of the Central High Atlas can be grouped into two main categories: subaerial compound pahoehoe flows and simple flows. The former type is exclusively confined to the Lower and Intermediate Formations, while simple flows occur in the Upper and Recurrent Formations. The dominance of compound flows in the two lowermost units of the CAMP suggests a slow emplacement during successive sustained eruptive episodes. Instead the thick single flows characterizing the Upper and Recurrent units indicate higher effusive rates. Basaltic pillow lavas (always of short lateral extent: 10 to 100 m), showing radial jointing and vitreous rinds, identical to those found in the Western Meseta, are occasionally associated with hyaloclastites in the base of the Intermediate Formation, immediately above clastic sediments, or in the Upper Formation. The occurrence of pillow lavas does not imply a generalized subaqueous environment at the time of the lava emission. Instead, they represent subaerial flows that entered small lakes occupying depressions on the volcanic topography of the Lower and Intermediate Formations. The short lateral extent of the pillow lavas and their constant stratigraphic position, the existence of lava flows with unequivocal subaerial characteristics associated to sediments containing fossilized wood, clearly indicate onshore emplacement. |
| first_indexed | 2024-03-11T16:14:16Z |
| format | Article |
| id | doaj.art-7c91e88034004ff4b80d50d53f753bde |
| institution | Directory Open Access Journal |
| issn | 1778-7025 |
| language | English |
| last_indexed | 2024-03-11T16:14:16Z |
| publishDate | 2020-07-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Géoscience |
| spelling | doaj.art-7c91e88034004ff4b80d50d53f753bde2023-10-24T14:24:18ZengAcadémie des sciencesComptes Rendus. Géoscience1778-70252020-07-013526-745547310.5802/crgeos.710.5802/crgeos.7Physical volcanology and emplacement mechanism of the Central Atlantic Magmatic Province (CAMP) lava flows from the Central High Atlas, MoroccoEl Hachimi, Hind0Youbi, Nasrrddine1Madeira, José2Marzoli, Andrea3https://orcid.org/0000-0003-0093-2759Mata, João4Bertrand, Hervé5Bensalah, Mohamed Khalil6Boumehdi, Moulay Ahmed7Doblas, Miguel8Medina, Fida9Ben Abbou, Mohamed10Martins, Línia11Geology Department, Faculty of Sciences, Chouaïb Doukkali University, 24000, El Jadida, MoroccoGeology Department, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, P.O. Box 2390, Marrakech, Morocco; Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, PortugalDepartamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal; Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, PortugalDipartimento di Geoscienze, Università di Padova, ItalyDepartamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal; Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, PortugalUniversité de Lyon, Laboratoire de Géologie de Lyon, Ecole Normale Supérieure de Lyon, Université Lyon 1, CNRS UMR 5276, Lyon, FranceGeology Department, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, P.O. Box 2390, Marrakech, Morocco; Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, PortugalGeology Department, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, P.O. Box 2390, Marrakech, Morocco; Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, PortugalInstituto de Geociencias (CSIC-UCM), c/ Doctor Severo Ochoa 7, Ciudad Universitaria, 28040, Madrid, SpainMoroccan Association of Geosciences, Oued Dra Street, 28, Rabat, MoroccoGeology Department, Faculty of Sciences Dhar Al Mahraz, Sidi Mohammed Ben Abdellah University, Fès, MoroccoDepartamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal; Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, PortugalThe best preserved and most complete lava flow sequences of the Central Atlantic Magmatic Province (CAMP) in Morocco are exposed in the Central High Atlas and can reach up to 300 m in thickness. Four distinct formations, emplaced in subaerial environments, are classically recognized: the Lower, Intermediate, Upper and Recurrent formations. These formations are separated by paleosoils and sedimentary sequences (mudstones, siltstones, sandstones, limestones), that are in general less than two meter-thick and may exceptionally reach a thickness of 80 m, representing minor periods of volcanic quiescence. CAMP lava flows of the Central High Atlas can be grouped into two main categories: subaerial compound pahoehoe flows and simple flows. The former type is exclusively confined to the Lower and Intermediate Formations, while simple flows occur in the Upper and Recurrent Formations. The dominance of compound flows in the two lowermost units of the CAMP suggests a slow emplacement during successive sustained eruptive episodes. Instead the thick single flows characterizing the Upper and Recurrent units indicate higher effusive rates. Basaltic pillow lavas (always of short lateral extent: 10 to 100 m), showing radial jointing and vitreous rinds, identical to those found in the Western Meseta, are occasionally associated with hyaloclastites in the base of the Intermediate Formation, immediately above clastic sediments, or in the Upper Formation. The occurrence of pillow lavas does not imply a generalized subaqueous environment at the time of the lava emission. Instead, they represent subaerial flows that entered small lakes occupying depressions on the volcanic topography of the Lower and Intermediate Formations. The short lateral extent of the pillow lavas and their constant stratigraphic position, the existence of lava flows with unequivocal subaerial characteristics associated to sediments containing fossilized wood, clearly indicate onshore emplacement.https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.7/Large igneous province (LIP)Central Atlantic Magmatic Province (CAMP)Pahoehoe flowsSimple flowsHigh AtlasMorocco |
| spellingShingle | El Hachimi, Hind Youbi, Nasrrddine Madeira, José Marzoli, Andrea Mata, João Bertrand, Hervé Bensalah, Mohamed Khalil Boumehdi, Moulay Ahmed Doblas, Miguel Medina, Fida Ben Abbou, Mohamed Martins, Línia Physical volcanology and emplacement mechanism of the Central Atlantic Magmatic Province (CAMP) lava flows from the Central High Atlas, Morocco Comptes Rendus. Géoscience Large igneous province (LIP) Central Atlantic Magmatic Province (CAMP) Pahoehoe flows Simple flows High Atlas Morocco |
| title | Physical volcanology and emplacement mechanism of the Central Atlantic Magmatic Province (CAMP) lava flows from the Central High Atlas, Morocco |
| title_full | Physical volcanology and emplacement mechanism of the Central Atlantic Magmatic Province (CAMP) lava flows from the Central High Atlas, Morocco |
| title_fullStr | Physical volcanology and emplacement mechanism of the Central Atlantic Magmatic Province (CAMP) lava flows from the Central High Atlas, Morocco |
| title_full_unstemmed | Physical volcanology and emplacement mechanism of the Central Atlantic Magmatic Province (CAMP) lava flows from the Central High Atlas, Morocco |
| title_short | Physical volcanology and emplacement mechanism of the Central Atlantic Magmatic Province (CAMP) lava flows from the Central High Atlas, Morocco |
| title_sort | physical volcanology and emplacement mechanism of the central atlantic magmatic province camp lava flows from the central high atlas morocco |
| topic | Large igneous province (LIP) Central Atlantic Magmatic Province (CAMP) Pahoehoe flows Simple flows High Atlas Morocco |
| url | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.7/ |
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