Stratigraphic and structural revision of the Upper Mesozoic succession of the Dadès valley, eastern Ouarzazate Basin (Morocco)

Benvenuti, Marco; Moratti, Giovanna; Algouti, Ahmed

doi:10.1016/j.jafrearsci.2017.01.018

Cited by 11 publications

(19 citation statements)

References 55 publications

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“…Further fieldwork in the Dadès River Valley (Ait Youl-Ait Ibriren area) allowed reconsidering the stratigraphic architecture of red beds and carbonates to the Middle Jurassic-Late Cretaceous (Fig. 4, Benvenuti et al 2017).…”

Section: The Study Areamentioning

confidence: 99%

“…Limited outcrops of basalts within this succession are found in the Dadès Valley and in the Jbel Istifane area, and have been referred in previous studies to the CAMP event (Hindermeyer et al 1977) and to the Cenomanian (Milhi 1997), respectively. A description of this succession, based upon our own observations and previous work (Benvenuti et al 2017), is given below starting from the stratigraphic bottom ( Fig. 4).…”

Section: Stratigraphy and Depositional Setting Of The Middle Jurassicmentioning

confidence: 99%

“…In the Dadès Valley, massive dark reddish mudstones alternating with conglomerates become dominant upward. These deposits form the infill of the wide (Dadès) and narrow (Jbel Istifane) SSEtrending paleovalleys drained by torrential streams incised in an incipient relief to the north (the southern front of a proto-CHA; Benvenuti et al 2017). Pebbly sandstones alternating with reddish-whitish massive mudstones become prevalent toward the top (sub-unit 1b) and unconformably overlie sub-unit 1a.…”

Section: Stratigraphy and Depositional Setting Of The Middle Jurassicmentioning

confidence: 99%

“…Following the CAMP magmatism, transitional to alkaline magmas emplaced all around the Central and South Atlantic Oceans, forming the so-called Cretaceous Peri-Atlantic Alkaline Pulse (PAAP) (Matton and Jébrak 2009). In the Central High Atlas (CHA), these transitional to alkaline magmas emplaced within thick poly-deformed sedimentary continental successions since the Middle Jurassic Faure-Muret 1960-1962;Frizon de Lamotte et al 2008;Ghorbal et al 2008;Benvenuti et al 2017). Previous studies on the Middle Jurassic-Early Cretaceous magmatic stage (Hailwood and Mitchell 1971;Westphal et al 1979;Harmand and Laville 1983;Beraâouz et al 1994;Amrhar et al 1997;Lachmi et al 2001;Zayane et al 2002;Charrière et al 2005;Bensalah et al 2013) provided chronologic calibration and petrographic-geochemical characteristics of basalts occurring in the northern front of the CHA.…”

mentioning

confidence: 99%

“…Recent field studies on Middle Jurassic-Upper Cretaceous continental deposits and intervening basalts exposed along the southern front of the CHA suggested a strict relation with crustal shortening, predating the Cenozoic tectonic inversion (Benvenuti et al 2017). To support this hypothesis, two basalt outocrops, interbedded within the continental deposits at the southern front of the CHA facing the eastern Ouarzazate Basin, have been dated ( 40 Ar-39 Ar) and analysed for their geochemical and radiogenic isotope (Sr, Nd) signature.…”

mentioning

confidence: 99%

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New 40Ar–39Ar dating of Lower Cretaceous basalts at the southern front of the Central High Atlas, Morocco: insights on late Mesozoic tectonics, sedimentation and magmatism

Moratti

Benvenuti

Santo

et al. 2018

Int J Earth Sci (Geol Rundsch)

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Your article is protected by copyright and all rights are held exclusively by Springer-Verlag GmbH Germany, part of Springer Nature. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com". AbstractThis study is based upon a stratigraphic and structural revision of a Middle Jurassic-Upper Cretaceous mostly continental succession exposed between Boumalne Dades and Tinghir (Southern Morocco), and aims at reconstructing the relation among sedimentary, tectonic and magmatic processes that affected a portion of the Central High Atlas domains. Basalts interbedded in the continental deposits have been sampled in the two studied sites for petrographic, geochemical and radiogenic isotope analyses. The results of this study provide: (1) a robust support to the local stratigraphic revision and to a regional lithostratigraphic correlation based on new 40 Ar-39 Ar ages (ca. 120 Ma) of the intervening basalts; (2) clues for reconstructing the relation between magma emplacement in a structural setting characterized by syn-depositional crustal shortening pre-dating the convergent tectonic inversion of the Atlasic rifted basins; (3) a new and intriguing scenario indicating that the Middle Jurassic-Lower Cretaceous basalts of the Central High Atlas could represent the first signal of the present-day Canary Islands mantle plume impinging, flattening, and delaminating the base of the Moroccan continental lithosphere since the Jurassic, and successively dragged passively by the Africa plate motion to NE. The tectono-sedimentary and magmatic events discussed in this paper are preliminarily extended from their local scale into a peculiar geodynamic setting of a continental plate margin flanked by the opening and spreading Central Atlantic and NW Tethys oceans. It is suggested that during the late Mesozoic this setting created an unprecedented condition of intraplate stress for concurrent crustal shortening, related mountain uplift, and thinning of continental lithosphere.

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Section: The Study Areamentioning

confidence: 99%

Section: Stratigraphy and Depositional Setting Of The Middle Jurassicmentioning

confidence: 99%

Section: Stratigraphy and Depositional Setting Of The Middle Jurassicmentioning

confidence: 99%