2017
DOI: 10.1016/j.jafrearsci.2016.08.002
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The Ediacaran volcanic rocks and associated mafic dykes of the Ouarzazate Group (Anti-Atlas, Morocco): Clinopyroxene composition, whole-rock geochemistry and Sr-Nd isotopes constraints from the Ouzellarh-Siroua salient (Tifnoute valley)

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Cited by 32 publications
(8 citation statements)
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“…As for ignimbrites, tuffs with andesitic to rhyolitic composition are widespread through the Imiter sequence. Geochemically, all pyroclastic rocks at Igoudrane mine are characterized by a medium-to high-K calcalkaline, peraluminous signature, in accordance with other reported areas of the Anti-Atlas system [50].…”
Section: Volcanic and Volcaniclastic Rockssupporting
confidence: 88%
See 1 more Smart Citation
“…As for ignimbrites, tuffs with andesitic to rhyolitic composition are widespread through the Imiter sequence. Geochemically, all pyroclastic rocks at Igoudrane mine are characterized by a medium-to high-K calcalkaline, peraluminous signature, in accordance with other reported areas of the Anti-Atlas system [50].…”
Section: Volcanic and Volcaniclastic Rockssupporting
confidence: 88%
“…Neoproterozoic marine carbonates compositional field is from [69]. 87 Sr/ 86 Sr isotopic ratios for rhyolite and dacite are from [50]. Assuming an overall average temperature of 250 °C as inferred from fluid inclusion data and fahlore thermochemistry (Figure 13), the calculated oxygen isotope compositions of the ore-forming fluids (δ 18 O f V-SMOW) using the calcite-H2O fractionation factor of [67,68] range from 1.2 to 12.3‰; most are between 5 and 10‰.…”
Section: Figure 12mentioning
confidence: 99%
“…It is located in the central zone of the Anti-Atlas and belongs to the Pan-African Neoproterozoic domain. It is made up of a Pan-African basement and Upper to Terminal Neoproterozoic volcanic cover, as well as a much more recent Cretaceous and Neogene cover (Belkacim et al 2017). This massif is cut to the south by the Anti-Atlas Major Fault (AAMF) (Choubert 1947) (Fig.…”
Section: In the Eastmentioning
confidence: 99%
“…The different behaviours of the Ediacaran vs Cryogenian-Tonian zircons can be related to the contrasted terranes present in the Pan-African belts around the WAC, i.e. the Trans-Saharan belt (Liégeois et al, 1998(Liégeois et al, , 2003Fezaa et al, 2010), the Anti-Atlas belt (Ennih and Liégeois, 2008;Toummite et al, 2013;Belkacim et al, 2017), the Souttouf massif (Gärtner et al, 2016), the Bassarides and the Rockelides (Villeneuve et al, 2010(Villeneuve et al, , 2015. In these terranes, the juvenile Cryogenian and in a much lesser amount Tonian island arc terranes have been generated before the ocean closures (> 630 Ma), while the 630-545 Ma period corresponds to collision and post-collision events with large amounts of high-K calc-alkaline magmatism (Liégeois et al, 1998).…”
Section: U-pb Ages Of Magmatic Rocks and Comparison With The Brabant Massifmentioning
confidence: 99%
“…Such a situation could be imaged by the late Ediacaran Ouarzazate volcanic province in the Moroccan Anti-Atlas, which is very large (80 x 600 km), mostly felsic and potassic in composition, that lasted 60 Myr and which emplaced along the northern boundary of the West African craton (e.g. Ennih and Liégeois, 2008;Gasquet et al, 2008;Belkacim et al, 2017). Another example is the Early Cretaceous bimodal (basalts and rhyolites) Parana Province associated with the opening of the South Atlantic Ocean, which is very large with a preserved surface of > 1.2 million km 2 and an average thickness of 0.7 km (Peate, 1997 and references therein).…”
Section: The Bimodal Magmatismmentioning
confidence: 99%