Moroccan Hercynides; a synopsis; the Paleozoic sedimentary and tectonic evolution at the northern margin of West Africa

Piqué, Alain; Michard, André

doi:10.2475/ajs.289.3.286

Cited by 197 publications

(152 citation statements)

References 0 publications

Supporting

Mentioning

125

Contrasting

Unclassified

Order By: Relevance

“…Le Maroc a été subdivisé en cinq principaux domaines structuraux, Piqué, 1983;Piqué et Michard, 1989), (Fig.l).…”

Section: Subdivisions Géologiques Du Marocunclassified

“…Ce domaine fait partie du Bouclier Ouest Africain Piqué et Michard, 1989). Il est formé de séries du Protérozoique inférieur, extrêmement déformées et métamorphisées au cours de l'orogenèse éburnéenne (vers 2000 Ma).…”

Section: Domaine Saharienunclassified

“…Leur corrélation avec le reste de l'hercynien du Maroc est difficile (Piqué, 1983;Piqué et Michard, 1989).…”

Section: Les Principales Zones De La Chaîne Hercynienne Du Marocunclassified

“…En se basant sur l'évolution sédimentaire, stratigraphique et tectono-métamorphique, et en mettant l'accent sur le sens et l'intensité de la déformation hercynienne, trois zones distinctes ont été définies ( Fig.2) Piqué, 1983;Piqué et Michard, 1989). …”

Section: Les Principales Zones De La Chaîne Hercynienne Du Marocunclassified

“…A l'exception du bloc des Séhoul (Zone de Rabat-Tiflet), où l'on connaît une déformation ordovicienne, la déformation et les principaux épisodes de recristallisation sont partout ailleurs d'âge carbonifère Piqué, 1983;Piqué et Michard, 1989). La déformation hercynienne est caractérisée dans cette zone par des phases précoces de plissement, et/ou de chevauchement, allant du Dévonien supérieur au Viséen supérieur .…”

Section: La Chaîne Hercynienne De L'ouest Du Marocunclassified

See 4 more Smart Citations

Geochimie geochronologie (U-Pb) du pluton d Aouli et comparaisons geochimiques avec d autres granitoides hercyniens du Maroc par analyse discriminante

Oukemeni¹

1993

View full text Add to dashboard Cite

“…Le Maroc a été subdivisé en cinq principaux domaines structuraux, Piqué, 1983;Piqué et Michard, 1989), (Fig.l).…”

Section: Subdivisions Géologiques Du Marocunclassified

Section: Domaine Saharienunclassified

“…Leur corrélation avec le reste de l'hercynien du Maroc est difficile (Piqué, 1983;Piqué et Michard, 1989).…”

Section: Les Principales Zones De La Chaîne Hercynienne Du Marocunclassified

Section: La Chaîne Hercynienne De L'ouest Du Marocunclassified

See 3 more Smart Citations

Geochimie geochronologie (U-Pb) du pluton d Aouli et comparaisons geochimiques avec d autres granitoides hercyniens du Maroc par analyse discriminante

Oukemeni¹

1993

View full text Add to dashboard Cite

Magnitude of rift‐related burial and orogenic contraction in the Marrakech High Atlas revealed by zircon (U‐Th)/He thermochronology and thermal modeling

2016

View full text Add to dashboard Cite

The Atlas of Morocco is a continental rift developed during the Triassic‐Jurassic and moderately inverted during the Cenozoic. The High Atlas south of Marrakech, with exposures of basement and Triassic early synrift deposits, has been viewed as a high during the Mesozoic rifting. First zircon (U‐Th)/He ages and thermal models obtained from 42 samples in the Marrakech High Atlas following two NNW‐SSE transects across the mountain belt reveal that in contrast to previous models, the Triassic‐Jurassic rift was well developed in the Marrakech High Atlas (with more than 4.5–6 km of rift‐related deposits). Middle Jurassic‐Early Cretaceous zHe cooling ages obtained indicate that rift‐related subsidence in the Marrakech High Atlas finished in the Middle Jurassic and was followed by a period of exhumation where 2–3 km of rock were eroded. Thermal models from zHe data provide the first thermochronologic clue for a Late Cretaceous initiation of the Atlas compression‐driven exhumation in the inner parts of the Marrakech High Atlas. The Triassic‐Jurassic basin reconstruction assisted by thermochronology highlights a key role of inherited basement anisotropy in rift orientation and evolution, and on its subsequent inversion. Comparison of present‐day and restored sections to the rifting stage aided by thermochronology suggests minimum values of total orogenic shortening in the Marrakech High Atlas of 13 to 14 km (21 to 17%), with exhumation of 1 to more than 5 km of rocks. Similar zHe ages on both sides of the Tizi n'Test fault evince minor vertical movements along the fault during the Atlas orogeny.

show abstract

Mississippian Platform and Basin Successions from the Todrha Valley (northeastern Anti‐Atlas), southern Morocco

Graham

Sevastopulo

2007

Geological Journal

View full text Add to dashboard Cite

Carboniferous rocks of Mississippian age are exposed in Jebel Asdaf and Jebel Tisdafine, south and north respectively of the fault-controlled Todrha Valley, between the towns of Tinerhir and Tinejdad in the Anti-Atlas of southern Morocco. The age, as determined by microfossils, and facies of the dominantly siliciclastic successions of the two areas are different. The Jebel Asdaf Formation (245 m exposed; base and top not seen) is a shallow shelf sequence of late Tournaisian age. The Jebel Tisdafine Formation is a succession of turbidites (at least 1500 m thick), which rests unconformably on Devonian limestones and is of late Viséan age. Limestone beds in each formation have different origins. Skeletal grainstones and packstones in the Jebel Asdaf Formation formed when sand supply to the shelf was episodically reduced. Ooid-rich skeletal packstones and grainstones in the Jebel Tisdafine Formation, characterized also by the presence of well-rounded, coarse-sand grade quartz grains, were derived from a contemporary carbonate platform. Individual beds in the Jebel Tisdafine Formation are essentially tabular and can be followed for long distances. Channelling is very rare. The turbidites, which are quartz-rich, were transported from west to east across a basin floor with low slopes. Jebel Azguine, northwest of Tinejdad, is separated from Jebel Tisdafine by a major shear zone. It is made up of quartz sandstones that differ from those of both the Jebel Asdaf and Jebel Tisdafine formations in not containing any carbonate or body fossils, in its trace fossil assemblage dominated by vertical burrows, and in the presence of very thick beds. It is tentatively suggested that the Jebel Azguine sandstones are older than Carboniferous, to which they are assigned on some geological maps. The conclusions of this research are markedly different from accounts of the geology of the area published previously.

show abstract

Moroccan Hercynides; a synopsis; the Paleozoic sedimentary and tectonic evolution at the northern margin of West Africa

Cited by 197 publications

References 0 publications

Geochimie geochronologie (U-Pb) du pluton d Aouli et comparaisons geochimiques avec d autres granitoides hercyniens du Maroc par analyse discriminante

Geochimie geochronologie (U-Pb) du pluton d Aouli et comparaisons geochimiques avec d autres granitoides hercyniens du Maroc par analyse discriminante

Magnitude of rift‐related burial and orogenic contraction in the Marrakech High Atlas revealed by zircon (U‐Th)/He thermochronology and thermal modeling

Mississippian Platform and Basin Successions from the Todrha Valley (northeastern Anti‐Atlas), southern Morocco

Contact Info

Product

Resources

About