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Title: Basement/cover relationships of the Bergsdalen area, central south west Norway
Author: Forster, Jonathan James
ISNI:       0000 0001 3475 5549
Awarding Body: University of London
Current Institution: Royal Holloway, University of London
Date of Award: 1980
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The Bergsdalen area of central southwest Norway comprises late Archaean and early Proterozoic gneisses that are intruded by amphibolites and Sveconorwegian granites and gabbros; the gneisses were tectonically stacked, forming four structural units: 1. Autochthonous and parautochthonous acid and intermediate late Archaeanorthogneisses. 2. Parautochthonous Mixed Gneisses that contain lithologies of both the basement and the succeeding allochthon. 3. Allochthonous Egg jane Nappe, derived in the main from a Proterozoic quartz diorite pluton. 4. Allochthonous Lower Bergsdalen Nappe comprising Proterozoic calc-alkaline and tholeiitic metavolcanics and metasediments. The Basal orthogneisses were deformed at amphibolite facies during both the Svecofennian and Sveconorwegian orogenic cycles; Caledonian effects are minimal. The allochthonous gneisses have a pervasive amphibolite facies mylcnitic foliation, thought to be of Sveconorwegian origin, instead of Caledonian, as previously suggested. The allochthonous gneisses were uplifted, and reworked during a phase of nappe emplacement along mylornitic and phyllonitic thrust zones, during late Sveconorwegian times. This contrasts with the traditional view of the Lower Bergsdalen Nappe being Caledonian in age. Superimposed Green schist facies Caledonian folding and thrusting was restricted to higher structural levels, culminating in a cross fold to form the Bergen Arcs.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Geology