Review of the Cambrian volcanic activity in Morocco: geochemical fingerprints and geotectonic implications for the rifting of West Gondwana

Volcanic activities related to the opening of a Cambrian rift in Morocco were widespread from the Fortunian to the Cambrian Epoch 3. Numerous data are available from northwestern volcanic sites, particularly in the western High Atlas, but they are scarce from the southeastern sites. New data are doc...

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Veröffentlicht in:International journal of earth sciences : Geologische Rundschau Jg. 107; H. 6; S. 2101 - 2123
Hauptverfasser: Pouclet, André, El Hadi, Hassan, Álvaro, J. Javier, Bardintzeff, Jacques-Marie, Benharref, Mohammed, Fekkak, Abdelilah
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Berlin/Heidelberg Springer Berlin Heidelberg 01.09.2018
Springer Nature B.V
Springer Verlag
Schlagworte:
Cambrian
Composition
Cratons
Crystallization
Earth and Environmental Science
Earth Sciences
Fingerprints
Garnet
Geochemistry
Geology
Geophysics/Geodesy
Interactions
Magma
Mantle
Mineral Resources
Original Paper
Rifting
Sciences of the Universe
Sedimentology
Stratigraphy
Structural Geology
Volcanic activity
Morocco
Tholeiitic and transitional magmatism
Continental rift
Cambrian Atlas Rift
High Atlas
Intra-plate alkaline magmatism
Anti-Atlas
Moroccan Meseta
ISSN:1437-3254, 1437-3262
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Zusammenfassung:Volcanic activities related to the opening of a Cambrian rift in Morocco were widespread from the Fortunian to the Cambrian Epoch 3. Numerous data are available from northwestern volcanic sites, particularly in the western High Atlas, but they are scarce from the southeastern sites. New data are documented here from the volcanic formations exposed in the Jbel Tazoult n’Ouzina of the Tafilalt Province, eastern Anti-Atlas and dated to Cambrian Epoch 2–3. The Cambrian volcanic activities recorded in the High Atlas, Anti-Atlas, and Coastal Meseta are synthesized to refine their stratigraphic setting and to characterize their magmatic affinities and fingerprints. Six volcanic pulses are determined as tholeiitic, transitional, and alkaline suites. The tholeiitic and transitional magmas originated from primitive mantle and E-MORB-type sources with a spinel- and garnet-bearing lherzolite composition. Some of them were modified by assimilation–fractional crystallisation processes during crust–mantle interactions. The alkaline magmas fit with an OIB-type and a garnet-bearing lherzolite source. The palaeogeographic distribution of the magmatic suites was controlled by the lithospheric thinning of the Cambrian Atlas Rift and lithospheric constraints of the Pan-African metacraton and West African craton.
Bibliographie:ObjectType-Article-1
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ISSN:1437-3254
1437-3262
DOI:10.1007/s00531-018-1590-1