The Early-Cambrian Boho volcano of the El Graara massif, Morocco: Petrology, geodynamic setting and coeval sedimentation

Álvaro, J. Javier; Ezzouhairi, Hassan; Vennin, Emmanuelle; Ribeiro, Maria Luísa; Clausen, Sébastien; Charif, A.; Ayad, N. Ait; Moreira, M. E.

doi:10.1016/j.jafrearsci.2005.12.008

Cited by 42 publications

(13 citation statements)

References 37 publications

(36 reference statements)

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“…1, 2). Early Cambrian rift volcanism is also reported from Morrocco (Álvaro et al, 2006;Pouclet et al, 2008) but reconstructions of Cambrian paleogeography don't show a spatial relationship between Morroccon magmatism and the magmatism discussed in this study (Golonka and Gaweda, 2012;Dalziel et al, 2014;Fig. 1).…”

Section: Introductionmentioning

confidence: 59%

Cambrian intermediate-mafic magmatism along the Laurentian margin: Evidence for flood basalt volcanism from well cuttings in the Southern Oklahoma Aulacogen (U.S.A.)

Brueseke

Hobbs

Bulen

et al. 2016

Lithos

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The Southern Oklahoma Aulocogen (SOA) stretches from southern Oklahoma through the Texas panhandle and into Colorado and New Mexico, and contains mafic through silicic magmatism related to the opening of the Iapetus Ocean during the early Cambrian.Cambrian magmatic products are best exposed in the Wichita Mountains (Oklahoma), where they have been extensively studied. However, their ultimate derivation is still somewhat contentious and centers on two very different models: SOA magmatism has been suggested to occur via [1] continental rifting (with or without mantle plume emplacement) or [2] transform-fault related magmatism (e.g., leaky strike-slip faults). Within the SOA, the subsurface in and adjacent to the Arbuckle Mountains in southern Oklahoma contains thick sequences of mafic to intermediate lavas, intrusive bodies, and phreatomagmatic deposits interlayered with thick, extensive rhyolite lavas, thin localized tuffs, and lesser silicic intrusive bodies. These materials were first described in the Arbuckle Mountains region by a 1982 drill test (Hamilton Brothers Turner Falls well) and the best available age constraints from SOA Arbuckle Mountains eruptive products are ~535 to 540 Ma. Well cuttings of the mafic through intermediate units were collected from that well and six others and samples from all but the Turner Falls and Morton wellsare the focus of this study. Samples analyzed from the wells are dominantly subalkaline, tholeiitic, and range from basalt to andesite. Their overall bulk major and trace element chemistry, normative mineralogy, and Sr-Nd isotope ratios are similar to magmas erupted/emplaced in flood basalt provinces. When compared with intrusive mafic rocks that crop out in the Wichita Mountains, the SOA well cuttings are geochemically most similar to the Roosevelt Gabbros. New geochemical and isotope data presented in this study, when coupled with recent geophysical work in the SOA and the coeval relationship with rhyolites, indicates that the ~250,000 km 3 of early Cambrian mafic to silicic igneous rocks in the SOA were emplaced in a rifting event. This event is suggested to result from the break-up of Pannotia and the formation of the failed arm of a three-armed radial rift system.

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Section: Introductionmentioning

confidence: 59%

Cambrian intermediate-mafic magmatism along the Laurentian margin: Evidence for flood basalt volcanism from well cuttings in the Southern Oklahoma Aulacogen (U.S.A.)

Brueseke

Hobbs

Bulen

et al. 2016

Lithos

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“…This led to development of a multi-stage rifting, which reflects the diachronous opening of a finally aborted rift (Piqué et al, 1995;Soulaimani et al, 2003). The magmatism associated with this intra-plate extension shows tholeiitic and alkaline affinities, and a distinct diachroneity: it started earlier (latest Neoproterozoic) in the Anti-Atlas (Gasquet et al, 2005;Á lvaro et al, 2006a), reached the western High Atlas after the earliest Cambrian (Badra et al, 1992;Ait Ayad et al, 1998), and propagated even later in the Meseta domains (Ouali et al, 2000(Ouali et al, , 2003.…”

Section: Geological Setting and Stratigraphymentioning

confidence: 96%

Feldspar concentrations in lower Cambrian limestones of the Moroccan Atlas: Pyroclastic vs authigenic processes

Álvaro

Bauluz

2008

Journal of African Earth Sciences

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“…2) (Soulaimani et al, 2013). All these formations are interlayered locally with volcanic flows dated at 534 ± 10 Ma (U/Pb on zircon by Ducrot & Lancelot, 1977) related to the Jbel Boho-type volcanism (Alvaro et al, 2006) ( fig. 1 and 2).…”

Section: Lithostratigraphy Of the Jbel Laassel Cu-depositmentioning

confidence: 99%

A contribution to the synsedimentary versus epigenetic origin of the Cu mineralizations hosted by terminal Neoproterozoic to Cambrian formations of the Bou Azzer–El Graara inlier: New insights from the Jbel Laassel deposit (Anti Atlas, Morocco)

Bourque

Barbanson

Sizaret

et al. 2015

Journal of African Earth Sciences

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International audienceThe Neoproterozoic to Cambrian formations that compose the cover of the Bou Azzer–El Graara inlier, host a great number of Copper occurrence whose origin is largely discussed. To bring some light to this debate, structural, petrographic and geochemical observations were performed on the copper deposit of Jbel Laassel. This deposit, located at the extreme ESE of the Bou Azzer–El Graara inlier, is mined since 2012. At the district scale, the ore bodies localize in a folding band that extends along a NE–SW direction. At macroscopic, microscopic and scanning electron microscope scales the mineralization appears as banding veins, with locally cockade breccia and comb quartz textures. From the macroscopic scale to the scale of the scanning electron microscope, all these mineralized textures are connected there between forming a stockwork with an auto-similar structure in the range of used scales of observation. At the district scale, this stockwork is preferentially located in the anticlinal hinges of the folding band. Principal component analyses of geochemical database enable to distinguish several groups of chemical elements, each of these groups corresponding to the different lithologies and to the copper mineralization. This last group does not show any correlation with the distinguished lithological groups. All these observations bring new arguments to an epigenetic origin for the copper mineralization of the Jbel Laassel deposit, with a formation contemporary or posterior with the folding band development attributed to Variscan deformation

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The Early-Cambrian Boho volcano of the El Graara massif, Morocco: Petrology, geodynamic setting and coeval sedimentation

Cited by 42 publications

References 37 publications

Cambrian intermediate-mafic magmatism along the Laurentian margin: Evidence for flood basalt volcanism from well cuttings in the Southern Oklahoma Aulacogen (U.S.A.)

Cambrian intermediate-mafic magmatism along the Laurentian margin: Evidence for flood basalt volcanism from well cuttings in the Southern Oklahoma Aulacogen (U.S.A.)

Feldspar concentrations in lower Cambrian limestones of the Moroccan Atlas: Pyroclastic vs authigenic processes

A contribution to the synsedimentary versus epigenetic origin of the Cu mineralizations hosted by terminal Neoproterozoic to Cambrian formations of the Bou Azzer–El Graara inlier: New insights from the Jbel Laassel deposit (Anti Atlas, Morocco)

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