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Cenozoic uplift of Variscan Massifs in the Alpine foreland : timing and controlling mechanisms

Ziegler, P. A. and Dèzes, P.. (2007) Cenozoic uplift of Variscan Massifs in the Alpine foreland : timing and controlling mechanisms. Global and planetary change, Vol. 58. pp. 237-269.

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Official URL: http://edoc.unibas.ch/dok/A5250557

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Abstract

The European Cenozoic Rift System (ECRIS) and associated fault systems transect all Variscan Massifs in the foreland of the Alps. ECRIS was activated during the Eocene in the foreland of the Pyrenees and Alps in response to the build-up of collisionrelated intraplate stresses. During Oligocene and Neogene times ECRIS evolved by passive rifting under changing stress fields, reflecting end Oligocene consolidation of the Pyrenees and increasing coupling of the Alpine Orogen with its foreland. ECRIS is presently still active, as evidenced by its seismicity and geodetic data. Uplift of the Massif Central and the Rhenish Massif, commencing at the OligoceneMiocene transition, is mainly attributed to plume-related thermal thinning of the mantlelithosphere. Mid-Burdigalian uplift of the SWNE-striking VosgesBlack Forest Arch, that has the geometry of a doubly plunging anticline breached by the Upper Rhine Graben, involved folding of the lithosphere. Late Burdigalian broad uplift of the northern parts of the Bohemian Massif reflects lithospheric buckling whereas late MiocenePliocene uplift of its marginal blocks involved transpressional reactivation of pre-existing crustal discontinuities. Crustal extension across ECRIS, amounting to no more than 7 km, was compensated by a finite clockwise rotation of the Paris Basin block, up warping of the WealdArtois axis and reactivation of the Armorican shear zones. Intermittent, though progressive uplift of the Armorican Massif, commencing in the Miocene, is attributed to transpressional deformation of the lithosphere. Under the present-day NW-directed compressional stress field, that came into evidence during the early Miocene and further intensified during the Pliocene, the Armorican Massif, the Massif Central, the western parts of the Rhenish Massif and the northern parts of the Bohemian Massif continue to rise at rates of up to 1.75 mm/y whilst the VosgesBlack Forest arch is relatively stable. Uplift of the Variscan Massifs an
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geologie-Paläontologie > Tektonik (nn)
UniBasel Contributors:Ziegler, Peter
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Elsevier
ISSN:0921-8181
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:08 Nov 2012 16:21
Deposited On:22 Mar 2012 14:16

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