Note preliminaire sur le Pontien au Maroc; essai de synthese orogenique du Maroc atlasique

Cirot, Georges

doi:10.2113/gssgfbull.s5-xv.9.677

Cited by 19 publications

(21 citation statements)

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“…Here, the experimental results provide an alternative explanation in the long-standing debate on the origin of high-elevation, low-relief surface remnants observed in several mountain belts throughout the world, including the Southern Rocky Mountains, the Pyrenees, the Atlas (e.g. Davis, 1911;Birot, 1937;Choubert, 1945;de Sitter, 1952;Scott, 1975;Molnar and England, 1990). Most interpretations consider that uplift, whatever its origin is, is required to explain the high elevation of low-relief surface remnants that are supposed to have developed near sea-level.…”

Section: Discussionmentioning

confidence: 87%

High elevation of low‐relief surfaces in mountain belts: does it equate to post‐orogenic surface uplift?

et al. 2007

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International audienceWe present experiments of upraising and relaxing topographies showing that peneplanation can occur above the ultimate base level (sea level). After active uplift, the erosion of a topography bounded by a piedmont generates a final smooth and highly elevated topography. Smoothing at high elevation is even possible during active uplift if the evolution of topography is disrupted by the deposition of the products of erosion on its piedmont which is the case at the transition from underfilled to overfilled conditions in foreland basins

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Section: Discussionmentioning

confidence: 87%

High elevation of low‐relief surfaces in mountain belts: does it equate to post‐orogenic surface uplift?

et al. 2007

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“…The crustal orogeny that produced the present elevations of the High Atlas and Antiatlas mountains began in the late Miocene and continued into the middle Pliocene (Choubert, 1945). The Sous valley, a broad syncline, was formed during the initial uplift of the High and Antiatlas ranges.…”

Section: Methodsmentioning

confidence: 99%

Millipeds of the genus Polydesmorhachis Pocock (Polydesmida, Platyrhacidae) / Richard L. Hoffman.

Hoffman¹

1975

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“…A compressional tectonics regime has continued through the Quaternary to the present day, as indicated by significant current seismicity (Medina and Cherkaoui, 1991;Sébrier et al, 2006). Detailed analyses of stream morphology provide evidence for the post-Miocene initiation of relief (Babault et al, 2008) and for Late Quaternary tectonism (Choubert, 1946;Raynal, 1961;Martin, 1981;Lefèvre, 1989;Beauchamp et al, 1996;Gomez et al, 1996).…”

Section: Geomorphological and Paleoclimatic Settingmentioning

confidence: 99%

Pleistocene cold climate groundwater silicification, Jbel Ghassoul region, Missour Basin, Morocco

Thiry

Milnes

Brahim

2014

JGS

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Surficial silicifications have been long considered to be indicative of warm and dry climates. Here we describe various forms of supergene silicification in a Miocene lacustrine sequence in the Missour Basin near Jbel Ghassoul (Morocco) in a landscape with accentuated relief. The silicification is almost exclusively limited to a 10-40 m wide zone from the edges of scarp and mesa landforms. This distribution is interpreted to record the locations where groundwaters which produced the silicification discharged from a higher level paleolandscape. The main component of the silica was imported late and significantly postdates the deposition of the sediments. This implies that significant volumes of silica-bearing solutions flowed through these formations in response to an hydraulic gradient generated by relief. Silicification thus occurred only after uplift and incision of the sedimentary fill of the Missour Basin. The zones of silicification of the Jbel Ghassoul sequence can be linked geomorphically to remnants of high level pediments that have been dated in the literatures as early to middle Pleistocene and interpreted to have been formed during cold climates. Low temperatures in outcrops near the discharge zones during cold periods is considered to be a key factor in silica precipitation from groundwaters.

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Note preliminaire sur le Pontien au Maroc; essai de synthese orogenique du Maroc atlasique

Cited by 19 publications

References 0 publications

High elevation of low‐relief surfaces in mountain belts: does it equate to post‐orogenic surface uplift?

High elevation of low‐relief surfaces in mountain belts: does it equate to post‐orogenic surface uplift?

Millipeds of the genus Polydesmorhachis Pocock (Polydesmida, Platyrhacidae) / Richard L. Hoffman.

Pleistocene cold climate groundwater silicification, Jbel Ghassoul region, Missour Basin, Morocco

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