U–Pb baddeleyite ages and geochemistry of dolerite dykes in the Bas Drâa Inlier of the Anti-Atlas of Morocco: Newly identified 1380 Ma event in the West African Craton

Bahat, Abdelhakim El; Ikenne, Moha; Söderlund, Ulf; Cousens, Brian; Youbi, Nasrrddine; Ernst, Richard E.; Soulaı̈mani, Abderrahmane; Janati, M’hamed El; Hafid, Ahmid

doi:10.1016/j.lithos.2012.07.022

Cited by 94 publications

(23 citation statements)

References 57 publications

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“…The same ages have been obtained for rapakivi granites, layered gabbro (Kusa-Kopan Intrusion), carbonatites (Sibirka) and dolerite dykes and sills that widely developed in the Southern Urals and are encountered in boreholes of the East European platform; magmatic rocks of the same age are traced to Greenland, Laurentia and Siberian cratons, and represent the beginning of the Nuna supercontinent breakup (Ernst et al, 2008;Puchkov, 2013c;El Bahat et al, 2013).…”

Section: Plume Tectonicssupporting

confidence: 58%

New data on geology of the Southern Urals: a concise summary of research after the period of EUROPROBE activity

Пучков

2016

Solid Earth

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Abstract. The period of official activity of the EUROPROBE commission was conducted in the Urals with implementation of the URALIDES program, which stimulated many qualified geologists from western research institutes and universities to come to the region and work with local geologists on topical problems of Uralian geology. The author aims to answer questions as to what interesting results have been obtained in the Southern Urals in the last decade, after most foreign researchers left the Urals, and how these results correspond to the scientific conclusions that had been reached before.

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Section: Plume Tectonicssupporting

confidence: 58%

New data on geology of the Southern Urals: a concise summary of research after the period of EUROPROBE activity

Пучков

2016

Solid Earth

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“…1.65 Ga (Kouyaté et al ., ) and c . 1.4 Ga (El Bahat et al ., ; Michard & Gasquet, ; Söderlund et al ., ). The 176 Hf/ 177 Hf v .…”

Section: Discussionunclassified

Provenance of the HP–HT subducted margin in the Variscan belt (Cabo Ortegal Complex, NW Iberian Massif)

Albert

Arenas

Gerdes

et al. 2015

Journal Metamorphic Geology

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The Variscan Upper Allochthon is a continental-affinity terrane that recorded a Cambrian-Ediacaran magmatic arc generation, a subsequent transition to a passive margin, and a collision-related high-P metamorphism during the Devonian-Carboniferous amalgamation of Pangea. The objective of this article is to decipher which continental margin subducted in the Devonian high-P-high-T (HP-HT) event. To do so, a provenance study is presented using combined U-Pb (n = 613) and Lu-Hf (n = 463) isotopic LA-ICP-MS zircon analyses and Sm-Nd whole-rock (n = 5) determinations. These analyses have been performed on five samples of the Banded Gneisses (Cabo Ortegal Complex, NW Iberia), which forms a part of the HP-HT bottom member of the Upper Allochthon. PalaeozoicNeoproterozoic zircon ages (34.7%) have a maximum abundance at 522-512 Ma, peaks at 575, 561, 545 Ma and minor abundance peaks between 780 and 590 Ma, and show from their Lu-Hf compositions a volcanic arc mixing pattern. This arc was probably related to the Cadomian arc system. The Mesoproterozoic population is scarce and scattered (2.8%), and due to its Lu-Hf pattern, it is proposed that this population is also West Africa Craton derived. The Paleoproterozoic population (39.6%) is concentrated at 2.07 Ga and it is linked to the Eburnean Orogeny, where depleted mantle derived magmas intruded an Archean craton margin. This craton is represented by the Archean population (22.8%), which is grouped at 3.0, 2.68-2.61 and 2.52-2.48 Ga, and shows long-term reworking processes and at least two juvenile magma intrusions. These data show that the Variscan Upper Allochthon has a West African provenance and therefore, it strongly suggests that the NW Iberian allochthonous complexes and their correlative European terranes are also West Africa derived. These results allow us to finally clarify that the first high-P event, recorded during the eo-Variscan amalgamation of Pangea, was attained by the subduction of the margin of Gondwana under Laurussia.

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“…Mafic magmatism in the Anti Atlas is represented by intraplate basaltic dykes intruded between ca. 1.8 and 1.4 Ga (El Bahat et al, 2013;Kouyaté et al, 2013;Youbi et al, 2013) and by ophiolites accreted at ca. 0.7-0.6 Ga (Thomas et al, 2002;D'Lemos et al, 2006;Gasquet et al, 2008).…”

Section: Accepted M M a N U mentioning

confidence: 99%

Proterozoic to Mesozoic evolution of North-West Africa and Peri-Gondwana microplates: Detrital zircon ages from Morocco and Canada

Marzoli

Davies

Youbi

et al. 2017

Lithos

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The complex history of assemblage and disruption of continental plates surrounding the Atlantic Ocean is in part recorded by the distribution of detrital zircon ages entrained in continental sedimentary strata from Morocco (Central High Atlas and Argana basins) and Canada (Grand Manan Island, New Brunswick). Here we investigate detrital zircon from the latest Triassic (ca. 202 Ma) sedimentary strata directly underlying lava flows of the Central Atlantic magmatic province or interlayered within them. SHRIMP (Sensitive High-Resolution Ion Microprobe) and LA-ICP-MS (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry) U-Pb ages for zircon range from Paleozoic to Archean with a dominant Neoproterozoic peak, and significant amounts of ca. 2 Ga zircon. These ages suggest a prevailing West African (Gondwanan) provenance at all sampling sites. Notably, the Paleoproterozoic zircon population is particularly abundant in central Morocco, north of the High Atlas chain, suggesting the presence of Eburnean-aged rocks in this part of the country, which is consistent with recent geochronologic data from outcropping rocks. Minor amounts of late Mesoproterozoic and early Neoproterozoic zircon (ca. 1.1-0.9 Ga) in Moroccan samples are more difficult to interpret. A provenance from Avalonia or Amazonia, as proposed by previous studies is not supported by the age distributions observed here. An involvement of more distal source regions, possibly located in northeastern Africa (Arabian Nubian Shield) would instead be possible. Paleozoic zircon ages are abundant in the Canadian sample, pointing to a significant contribution from Hercynian aged source rocks. Such a signal is nearly absent in the Moroccan samples, suggesting that zircon-bearing Hercynian granitic rocks of the Moroccan Meseta block were not yet outcropping at ca. 200

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U–Pb baddeleyite ages and geochemistry of dolerite dykes in the Bas Drâa Inlier of the Anti-Atlas of Morocco: Newly identified 1380 Ma event in the West African Craton

Cited by 94 publications

References 57 publications

New data on geology of the Southern Urals: a concise summary of research after the period of EUROPROBE activity

New data on geology of the Southern Urals: a concise summary of research after the period of EUROPROBE activity

Provenance of the HP–HT subducted margin in the Variscan belt (Cabo Ortegal Complex, NW Iberian Massif)

Proterozoic to Mesozoic evolution of North-West Africa and Peri-Gondwana microplates: Detrital zircon ages from Morocco and Canada

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