Pleistocene cold climate groundwater silicification, Jbel Ghassoul region, Missour Basin, Morocco - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of the Geological Society Année : 2015

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

(1) , (2) , (3)
1
2
3

Résumé

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 post-dates 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.
Fichier principal
Vignette du fichier
Thiry&al_2015_Ghassoul_Si.pdf (1.44 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01236657 , version 1 (02-12-2015)

Identifiants

Citer

Médard Thiry, Milnes Antony, Mohamed Ben Brahim. Pleistocene cold climate groundwater silicification, Jbel Ghassoul region, Missour Basin, Morocco. Journal of the Geological Society, 2015, ⟨10.1144/0016-76492014-033⟩. ⟨hal-01236657⟩
56 Consultations
321 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More