{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,17]],"date-time":"2026-01-17T08:13:17Z","timestamp":1768637597098,"version":"3.49.0"},"reference-count":95,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2021,10,7]],"date-time":"2021-10-07T00:00:00Z","timestamp":1633564800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100005639","name":"Universidade de S\u00e3o Paulo","doi-asserted-by":"publisher","award":["USP-UCAM\/2016"],"award-info":[{"award-number":["USP-UCAM\/2016"]}],"id":[{"id":"10.13039\/501100005639","id-type":"DOI","asserted-by":"publisher"}]},{"name":"the Russian Science Foundation","award":["14.Y26.31.0012"],"award-info":[{"award-number":["14.Y26.31.0012"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Minerals"],"abstract":"<jats:p>The NE\u2013SW trending Tiddas Souk Es-Sebt des Ait Ikko (TSESDAI) basin, located at 110 km southeast of Rabat, in the region of Khmesset between the village of Tiddas and Souk Es-Sebt des Ait Ikko, is the third largest late Palaeozoic continental trough in the northern Central Moroccan Meseta. It is a ~20 km long and ~2\u20133 km wide basin, comprising mainly mixed volcano-sedimentary reddish-purple continental Permian rocks laying with an angular unconformity on Visean deep marine siliciclastic sediments and unconformably overlain by the Triassic and Cenozoic formations. In this study we aim to better determine the age of Permian volcanics and their chemical and mineralogical characteristics, as well as assess the provenance of inherited zircons, thus contributing to the understanding of the late stages of the Variscan orogeny in Morocco. The standard volcanic succession includes the following terms: (i) andesites, lapilli tuffs and andesitic ash deposits; (ii) accumulations of rhyolitic lavas; (iii) lapilli tuffs and rhyolitic ash (formation F1); (iv) flows and breccias of dacites; (v) andesite flows; and (vi) basaltic flows. The various volcanic and subvolcanic studied rocks display calc-alkaline-series characteristics with high contents of SiO2, Al2O3, CaO, MgO, and relatively abundant alkalis, and low contents of MnO. In the classification diagram, the studied facies occupy the fields of andesites, trachy-basalts, dacites, trachydacites, and rhyolites and display a sub-alkaline behavior. These lavas would be derived from a parental mafic magma (basalts) produced by partial fusion of the upper mantle. Specific chemical analyses that were carried out on the mineralogical phases (biotite and pyroxene) revealed that the examined biotites can be classified as magnesian and share similarities with the calc-alkaline association-field, while the clinopyroxenes are mainly augites and plot on the calc-alkaline orogenic basalt field. Andesites and dacites of TSESDAI show similarities with the rocks of the calc-alkaline series not linked to active subduction and which involve a continental crust in their genesis. The existence of enclaves in the lavas of the TSESDAI massif; the abnormally high contents of Rb, Ba, Th, and La; and the systematic anomalies in TiO2 and P2O5 indicate also a crustal contamination mechanism. Three magmatic episodes are distinguished with two episodes that correspond to an eruptive cycle of calc-alkaline andesites and rhyolites followed by a basaltic episode. The SHRIMP U\u2013Pb geochronologic data of zircons recovered from the rhyolite dome of Ari El Mahsar in TSESDAI basin show a Concordia age of 286.4 \u00b1 4.7 Ma interpreted to date the magmatic crystallization of this dome. Thus, the rhyolite likely belongs to the third magmatic episodes of TSESDAI.<\/jats:p>","DOI":"10.3390\/min11101099","type":"journal-article","created":{"date-parts":[[2021,10,8]],"date-time":"2021-10-08T21:23:55Z","timestamp":1633728235000},"page":"1099","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["U\u2013Pb Zircon Geochronological and Petrologic Constraints on the Post-Collisional Variscan Volcanism of the Tiddas-Souk Es-Sebt des A\u00eft Ikko Basin (Western Meseta, Morocco)"],"prefix":"10.3390","volume":"11","author":[{"given":"Ismail","family":"Hadimi","sequence":"first","affiliation":[{"name":"Department of Geology, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, Marrakech P.O. Box 2390, Morocco"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3466-2400","authenticated-orcid":false,"given":"Nasrrddine","family":"Youbi","sequence":"additional","affiliation":[{"name":"Department of Geology, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, Marrakech P.O. Box 2390, Morocco"},{"name":"Faculty of Geology and Geography, Tomsk State University, 634050 Tomsk, Russia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3366-3412","authenticated-orcid":false,"given":"Abdelhak","family":"Ait Lahna","sequence":"additional","affiliation":[{"name":"Department of Geology, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, Marrakech P.O. Box 2390, Morocco"}]},{"given":"Mohamed Khalil","family":"Bensalah","sequence":"additional","affiliation":[{"name":"Department of Geology, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, Marrakech P.O. Box 2390, Morocco"},{"name":"Instituto DomLuiz, Faculdade de Ci\u00eancias, Universidade de Lisbona, 1749-016 Lisboa, Portugal"}]},{"given":"Oussama","family":"Moutbir","sequence":"additional","affiliation":[{"name":"Department of Geology, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, Marrakech P.O. Box 2390, Morocco"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5769-7708","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Mata","sequence":"additional","affiliation":[{"name":"Instituto DomLuiz, Faculdade de Ci\u00eancias, Universidade de Lisbona, 1749-016 Lisboa, Portugal"}]},{"given":"Miguel","family":"Doblas","sequence":"additional","affiliation":[{"name":"Instituto de Geociencias (CSIC-UCM), Ciudad Universitaria, c\/Doctor Severo Ochoa 7, 28040 Madrid, Spain"}]},{"given":"Colombo Celso Gaeta","family":"Tassinari","sequence":"additional","affiliation":[{"name":"Centro de Pesquisas Geocronol\u00f3gicas (CPGeo), Instituto de Geoci\u00eancias (IG), Universidade de S\u00e3o Paulo\u2014USP, S\u00e3o Paulo 05422-970, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7912-6671","authenticated-orcid":false,"given":"Laura","family":"Gaggero","sequence":"additional","affiliation":[{"name":"Department of Earth, Environment and Life Sciences, University of Genoa, Corso Europa 26, 16132 Genoa, Italy"}]},{"given":"Miguel Angelo Stipp","family":"Basei","sequence":"additional","affiliation":[{"name":"Instituto de Geoci\u00eancias (IG), Departamento de Mineralogia e Geotect\u00f4nica (GMG), Universidade de S\u00e3o Paulo\u2014USP, Rua do Lago, 562 Cidade Universit\u00e1ria, S\u00e3o Paulo 05508-080, Brazil"}]},{"given":"Kei","family":"Sato","sequence":"additional","affiliation":[{"name":"Centro de Pesquisas Geocronol\u00f3gicas (CPGeo), Instituto de Geoci\u00eancias (IG), Universidade de S\u00e3o Paulo\u2014USP, S\u00e3o Paulo 05422-970, Brazil"}]},{"given":"Warda","family":"El Moume","sequence":"additional","affiliation":[{"name":"Department of Geology, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, Marrakech P.O. Box 2390, Morocco"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5084-1551","authenticated-orcid":false,"given":"Moulay Ahmed","family":"Boumehdi","sequence":"additional","affiliation":[{"name":"Department of Geology, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, Marrakech P.O. Box 2390, Morocco"},{"name":"Instituto DomLuiz, Faculdade de Ci\u00eancias, Universidade de Lisbona, 1749-016 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,10,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"89","DOI":"10.1016\/S0899-5362(97)00138-3","article-title":"Permo-Carboniferous volcanism in Europe and northwest Africa: A superplume exhaust valve in the centre of Pangaea?","volume":"26","author":"Doblas","year":"1998","journal-title":"J. Afr. 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