Age map of the metamorphic structure of the Alps; tectonic interpretation and outstanding problems

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Authors:Handy, M. R.; Oberhänsli, Roland
Volume Title:Metamorphic structure of the Alps; explanatory notes to the map 1:100000
Volume Authors:Oberhänsli, Roland, editor
Source:Metamorphic structure of the Alps; explanatory notes to the map 1:100000, edited by Roland Oberhänsli. Mitteilungen der Österreichischen Mineralogischen Gesellschaft, Vol.149, p.201-226. Publisher: Österreichische Mineralogische Gesellschaft, Vienna, Austria. ISSN: 1609-0144
Publication Date:2004
Note:In English; geol. sketch maps
Summary:The mapped distribution of post-Jurassic mineral isotopic ages in the Alps reveals two metamorphic cycles, each consisting of a pressure-dominated stage and a subsequent temperature-dominated stage: (1) a late Cretaceous cycle in the Eastern Alps, indicated on the map by purple dots and green colours; and (2) a late Cretaceous to early- to mid-Tertiary cycle in the Western and Central Alps, Corsica and the Tauern window, marked on the map with blue and red dots and yellow and orange colours. The first cycle is attributed to the subduction of part of the Austroalpine passive margin following Jurassic closure of the Middle Triassic, Meliata-Hallstatt ocean basin. This involved nappe stacking, extensional exhumation and cooling. The second cycle is related to the subduction of the Jurassic-Cretaceous, Liguro-Piemont and Valais ocean basins as well as distal parts of the European and Apulian continental margins. Subsequent exhumation and cooling of the Tertiary nappe pile occurred during oblique indentation of Europe by the Apulian margin in Oligo-Miocene time. Despite a wealth of geochronologic work in the Alps, there are still large areas where relevant data are lacking or where existing data yield conflicting interpretations. Most such conflicts reflect the difficulty of relating the behaviour of mineral isotopic systems to the formation of structures and to the stability of metamorphic mineral assemblages. The age map of metamorphic structure thus also points to areas of future research in the Alps. [H.P.B.]
Subsections:Metamorphism: regional, dynamic
Subjects:Explanatory text; Facies; Metamorphism; Orogenic belts; Polymetamorphism; Tectonic elements; Tectonics; Alps; Austria; Central Europe; Croatia; Europe; France; Italy; Slovenia; Southern Europe; Switzerland; Western Europe
Abstract Numbers:05M/910
Record ID:2010046297
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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