Geochemistry of the early Cambrian succession in the western Anti-Atlas, Morocco: implications on provenance and paleoredox conditions
The Igoudine and Amouslek formations (TerreneuvianâCambrian Epoch 2 boundary) in the western Anti-Atlas of Morocco record the replacement of stromatolite-dominated microbial consortia by thrombolite-metazoan consortia. Carbonate and calcareous shales of both formations have been analyzed for major,...
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| Format: | Article |
| Language: | English |
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Estonian Academy Publishers
2023-09-01
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| Series: | Estonian Journal of Earth Sciences |
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| Online Access: | https://kirj.ee/wp-content/plugins/kirj/pub/earth-2-2023-171-184_20230921192047.pdf |
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| author | Abdelfattah Azizi Abderrazak El Albani Khadija El Hariri Asmaa El Bakhouch Olev Vinn Ahmid Hafid Kalle Kirsimäe |
| author_facet | Abdelfattah Azizi Abderrazak El Albani Khadija El Hariri Asmaa El Bakhouch Olev Vinn Ahmid Hafid Kalle Kirsimäe |
| author_sort | Abdelfattah Azizi |
| collection | DOAJ |
| description | The Igoudine and Amouslek formations (TerreneuvianâCambrian Epoch 2 boundary) in the western Anti-Atlas of Morocco record the replacement of stromatolite-dominated microbial consortia by thrombolite-metazoan consortia. Carbonate and calcareous shales of both formations have been analyzed for major, trace, and rare earth elements to study their geochemical characteristics and evaluate the provenance of the terrigenous fraction and paleoredox conditions. Discrimination diagrams for the source rocks based on major elements and selected trace elements indicate that the terrigenous fractions of the sediments were likely derived from predominantly felsic rocks, and the source rocks have been identified to be the PaleoproterozoicâNeoproterozoic granites and metasediments of the Kerdous inlier. Paleoredox proxies such as U/Al, V/Al and Mo/Al suggest that the Igoudine and Amouslek formations were deposited in the oxic environment. Our data show that the local water column was prevailingly oxidized before, during and after the transition from the microbial consortium (stromatolite-dominated biota) to the thrombolite-archaeocyathan consortium and shelly metazoans within the studied interval. This implies that the seawater redox status was not driving this change in these biological communities. |
| first_indexed | 2024-03-11T13:03:25Z |
| format | Article |
| id | doaj.art-62ebe24a2b854edfb7e24548e00e1d1c |
| institution | Directory Open Access Journal |
| issn | 1736-4728 1736-7557 |
| language | English |
| last_indexed | 2024-03-11T13:03:25Z |
| publishDate | 2023-09-01 |
| publisher | Estonian Academy Publishers |
| record_format | Article |
| series | Estonian Journal of Earth Sciences |
| spelling | doaj.art-62ebe24a2b854edfb7e24548e00e1d1c2023-11-03T14:53:30ZengEstonian Academy PublishersEstonian Journal of Earth Sciences1736-47281736-75572023-09-01722171184https://doi.org/10.3176/earth.2023.83https://doi.org/10.3176/earth.2023.83Geochemistry of the early Cambrian succession in the western Anti-Atlas, Morocco: implications on provenance and paleoredox conditionsAbdelfattah Azizi0Abderrazak El Albani1Khadija El Hariri2Asmaa El Bakhouch3Olev Vinn4Ahmid Hafid5Kalle Kirsimäe6Laboratoire de Géoressources, Géoenvironnement et Génie Civil, Département des Sciences de la Terre, Faculté des Sciences et Techniques, Université Cadi-Ayyad, BP 549, 40000 Marrakesh, Morocco; Département des Sciences de la Terre, Faculté des Sciences et Techniques-Guéliz, Université Cadi Ayyad, avenue Abdelkrim El Khattabi, BP 549, 40000 Marrakesh, Morocco; abdelfattah.azizi@edu.uca.ac.maLaboratoire IC2MP 7285 CNRS-INSU, Université de Poitiers, 86022 Poitiers, FranceLaboratoire de Géoressources, Géoenvironnement et Génie Civil, Département des Sciences de la Terre, Faculté des Sciences et Techniques, Université Cadi-Ayyad, BP 549, 40000 Marrakesh, Morocco; Département des Sciences de la Terre, Faculté des Sciences et Techniques-Guéliz, Université Cadi Ayyad, avenue Abdelkrim El Khattabi, BP 549, 40000 Marrakesh, MoroccoLaboratoire de Géoressources, Géoenvironnement et Génie Civil, Département des Sciences de la Terre, Faculté des Sciences et Techniques, Université Cadi-Ayyad, BP 549, 40000 Marrakesh, MoroccoDepartment of Geology, University of Tartu, Ravila 14A, 50411 Tartu, Estonia; olev.vinn@ut.eeLaboratoire de Géoressources, Géoenvironnement et Génie Civil, Département des Sciences de la Terre, Faculté des Sciences et Techniques, Université Cadi-Ayyad, BP 549, 40000 Marrakesh, Morocco; Département des Sciences de la Terre, Faculté des Sciences et Techniques-Guéliz, Université Cadi Ayyad, avenue Abdelkrim El Khattabi, BP 549, 40000 Marrakesh, MoroccoDepartment of Geology, University of Tartu, Ravila 14A, 50411 Tartu, EstoniaThe Igoudine and Amouslek formations (TerreneuvianâCambrian Epoch 2 boundary) in the western Anti-Atlas of Morocco record the replacement of stromatolite-dominated microbial consortia by thrombolite-metazoan consortia. Carbonate and calcareous shales of both formations have been analyzed for major, trace, and rare earth elements to study their geochemical characteristics and evaluate the provenance of the terrigenous fraction and paleoredox conditions. Discrimination diagrams for the source rocks based on major elements and selected trace elements indicate that the terrigenous fractions of the sediments were likely derived from predominantly felsic rocks, and the source rocks have been identified to be the PaleoproterozoicâNeoproterozoic granites and metasediments of the Kerdous inlier. Paleoredox proxies such as U/Al, V/Al and Mo/Al suggest that the Igoudine and Amouslek formations were deposited in the oxic environment. Our data show that the local water column was prevailingly oxidized before, during and after the transition from the microbial consortium (stromatolite-dominated biota) to the thrombolite-archaeocyathan consortium and shelly metazoans within the studied interval. This implies that the seawater redox status was not driving this change in these biological communities.https://kirj.ee/wp-content/plugins/kirj/pub/earth-2-2023-171-184_20230921192047.pdfearly cambrianatdabaniansource rockstrace elementspaleoredox |
| spellingShingle | Abdelfattah Azizi Abderrazak El Albani Khadija El Hariri Asmaa El Bakhouch Olev Vinn Ahmid Hafid Kalle Kirsimäe Geochemistry of the early Cambrian succession in the western Anti-Atlas, Morocco: implications on provenance and paleoredox conditions Estonian Journal of Earth Sciences early cambrian atdabanian source rocks trace elements paleoredox |
| title | Geochemistry of the early Cambrian succession in the western Anti-Atlas, Morocco: implications on provenance and paleoredox conditions |
| title_full | Geochemistry of the early Cambrian succession in the western Anti-Atlas, Morocco: implications on provenance and paleoredox conditions |
| title_fullStr | Geochemistry of the early Cambrian succession in the western Anti-Atlas, Morocco: implications on provenance and paleoredox conditions |
| title_full_unstemmed | Geochemistry of the early Cambrian succession in the western Anti-Atlas, Morocco: implications on provenance and paleoredox conditions |
| title_short | Geochemistry of the early Cambrian succession in the western Anti-Atlas, Morocco: implications on provenance and paleoredox conditions |
| title_sort | geochemistry of the early cambrian succession in the western anti atlas morocco implications on provenance and paleoredox conditions |
| topic | early cambrian atdabanian source rocks trace elements paleoredox |
| url | https://kirj.ee/wp-content/plugins/kirj/pub/earth-2-2023-171-184_20230921192047.pdf |
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