Anti-Atlas

Cirot, Georges; Faure-Muret, Anne

doi:10.1016/b978-0-08-030277-5.50012-2

Cited by 10 publications

(12 citation statements)

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“…Our recent structural analyses [20,47] confirm previous studies [23,64] in the sense that individual marker beds are just folded, but never thrust upon each other in a duplex style. We conclude that the Anti-Atlas folds are a natural case of truly polyharmonic buckle folding.…”

Section: The Anti-atlas Chain -What Kind Of Fold Belt?supporting

confidence: 76%

“…Large structural domes, the so-called boutonnières [22] of Proterozoic basement rocks, crop out at a very short distance behind the south-eastern front of the southwestern Anti-Atlas and these basement inliers punctuate the tightly folded Palaeozoic cover. The lack of any mapped thrusts has led earlier authors to consider even these basement uplifts as just another, deeper level of crustal scale folds [22,23] dubbed plis de fonds by Argand ( Fig. 5A-C) [5].…”

Section: The Anti-atlas Chain -What Kind Of Fold Belt?mentioning

confidence: 99%

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Tectonics of the Anti-Atlas of Morocco

Burkhard

Caritg

Helg

et al. 2006

Comptes Rendus. Géoscience

144

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The Anti-Atlas is reviewed and examined in the light of its geodynamic significance as a Palaeozoic basin and fold belt. Shortening is accommodated by polyharmonic buckle folding of the cover in a thick-skinned fashion without the development of any significant thrust/duplex systems. The Anti-Atlas is heavily inverted deep intracratonic basin, rather than a former passive margin of the Palaeo-Tethys Ocean. Inversion took place in Late Carboniferous to Early Permian times. Main shortening directions changed from NW-SE to north-south and maybe NE-SW through time, leading to the development of dome and basin patterns on scales from 100 m to 10 km.

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Section: The Anti-atlas Chain -What Kind Of Fold Belt?supporting

confidence: 76%

Section: The Anti-atlas Chain -What Kind Of Fold Belt?mentioning

confidence: 99%

Tectonics of the Anti-Atlas of Morocco

Burkhard

Caritg

Helg

et al. 2006

Comptes Rendus. Géoscience

144

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“…(b) Miocene-Recent paleogeography. Colored units and bar = Mesozoic and Cenozoic stratigraphy (Choubert & Faure-Muret, 1976). Numbered labels = ages of transition from carbonate to clastic deposition ; gray isopachs = thickness of Cenozoic sedimentary deposits (Hall & Nichols, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Macpherson et al, 2010). Orange polygons = basaltic igneous rocks (Choubert & Faure-Muret, 1976); triangles/squares/diamonds = intrusive/extrusive igneous rocks as indicated. Figure 7: (a) Long wavelength Bornean topography calculated from ETOPO1 database using Gaussian filter that is 100 km wide.…”

Section: Discussionmentioning

confidence: 99%

A Neogene history of mantle convective support beneath Borneo

White

Hoggard

Ball

et al. 2018

Earth and Planetary Science Letters

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Most, but not all, geodynamic models predict 1-2 km of mantle convective draw-down of the Earth's surface in a region centered on Borneo within southeast Asia. Nevertheless, there is geomorphic, geologic and geophysical evidence which suggests that convective uplift might have played some role in sculpting Bornean physiography. For example, a long wavelength free-air gravity anomaly of +60 mGal centered on Borneo coincides with the distribution of Neogene basaltic magmatism and with the locus of sub-plate slow shear wave velocity anomalies. Global positioning system measurements, an estimate of elastic thickness, and crustal isostatic considerations suggest that regional shortening does not entirely account for kilometer-scale regional elevation. Here, we explore the possible evolution of the Bornean landscape by extracting and modeling an inventory of 90 longitudinal river profiles. Misfit between observed and calculated river profiles is minimized by smoothly varying uplift rate as a function of space and time. Erosional parameters are chosen by assuming that regional uplift postdates Eocene deposition of marine carbonate rocks. The robustness of this calibration is tested against independent geologic observations such as thermochronometric measurements, offshore sedimentary flux calculations, and the history of volcanism. A calculated cumulative uplift history suggests that kilometer-scale Bornean topography grew rapidly during Neogene times. This suggestion is corroborated by an offshore Miocene transition from carbonate to clastic deposition. Co-location of regional uplift and slow shear wave velocity anomalies immediately beneath the lithospheric plate implies that regional uplift could have been at least partly generated and maintained by temperature anomalies within an asthenospheric channel.

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“…The AntiAtlas Major Fault (AAMF), which is inherited from the Pan-African shortening, runs roughly E-W and subdivides the belt into two distinct domains (Choubert 1947). South of the AAMF, the Anti-Atlas basement rocks consist of the Eburnean Paleoproterozoic schists and granitic intrusions and their Neoproterozoic shallow-water series, which were folded and metamorphosed during the Eburnean and the Pan-African orogenies (Walsh et al 2002;Thomas et al 2002;Gasquet et al 2008;Soulaimani et al 2014).…”

Section: Figmentioning

confidence: 99%