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Metamorphism of metasediments at the scale of an orogen : key to the Tertiary geodynamic evolution of the Alps

Bousquet, Romain and Oberhaensli, Roland and Goffe, Bruno and Wiederkehr, Michael and Koller, Friedrich and Schmid, Stefan M. and Schuster, Ralf and Engi, Martin and Berger, Alfons and Martinotti, Giorgio. (2008) Metamorphism of metasediments at the scale of an orogen : key to the Tertiary geodynamic evolution of the Alps. Geological Society Special Publications, 298. pp. 393-411.

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Abstract

Major discoveries in metamorphic petrology, as well as other geological disciplines, have been made in the Alps. The regional distribution of Late CretaceousTertiary metamorphic conditions, documented in post-Hercynian metasediments across the entire Alpine belt from CorsicaTuscany in the west to Vienna in the east, is presented in this paper. In view of the uneven distribution of information, we concentrate on type and grade of metamorphism; and we elected to distinguish between metamorphic paths where either pressure and temperature peaked simultaneously, or where the maximum temperature was reached at lower pressures, after a significant temperature increase on the decompression path. The results show which types of process caused the main metamorphic imprint: a subduction process in the western Alps, a collision process in the central Alps, and complex metamorphic structures in the eastern Alps, owing to a complex geodynamic and metamorphic history involving the succession of the two types of process. The western Alps clearly show a relatively simple picture, with an internal (high-pressure dominated) part thrust over an external greenschist to low-grade domain, although both metamorphic domains are structurally very complex. Such a metamorphic pattern is generally produced by subduction followed by exhumation along a cool decompression path. In contrast, the central Alps document conditions typical of subduction (and partial accretion), followed by an intensely evolved collision process, often resulting in a heating event during the decompression path of the early-subducted units. Subduction-related relics and (collisional/decompressional) heating phenomena in different tectonic edifices characterize the Tertiary evolution of the Eastern Alps. The Tuscan and Corsica terrains show two different kinds of evolution, with Corsica resembling the western Alps, whereas the metamorphic history in the Tuscan domain is complex owing to the late evolution of the Ap
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geologie-Paläontologie > Tektonik (nn)
UniBasel Contributors:Schmid, Stefan M.
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Geological Society
ISSN:0305-8719
e-ISSN:2041-4927
Note:Also published in: Tectonic aspects of the Alpine-Dinaride-Carpathian system. - London : Geological Society, 2008. - S. 393-412 -- Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:06 Nov 2017 13:38
Deposited On:22 Mar 2012 14:15

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