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Crustal-scale boudinage and migmatization of gneiss during their exhumation in the UHP Province of Western Norway.

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Title: Crustal-scale boudinage and migmatization of gneiss during their exhumation in the UHP Province of Western Norway.
Authors: Labrousse, L.1, Jolivet, L.1, Agard, P.1, Hébert, R.2, Andersen, T. B.3
Source: Terra Nova. Aug2002, Vol. 14 Issue 4, p263-270. 8p.
Subjects: Gneiss, Migmatite
Geographic Terms: Norway
Abstract: ABSTRACT A field study in the coesite province, the deepest unit of the Norwegian Caledonides, gives new constraints on the rheological behaviour of the continental crust during exhumation. Lithological heterogeneities and differential retrogression led to crustal-scale boudinage during the late-orogenic intense E–W stretching event in the footwall of the Nordfjord-Sogn Detachment. The main gneissic lithologies display a modest but widespread syn-exhumation migmatization. Textural criteria allow estimation of a 30% fusion rate. Partial melting mostly post-dates eclogitization and is synchronous with ductile stretching and top-to-west shearing. Presented observations suggest that the melt reactions and migmatization resulted in a soft rheology. During subduction to ~ 100 km depth and subsequent exhumation, crustal viscosity can be reduced by up to four orders of magnitude. Models are discussed that consider a transition from a small internal strain of the crust to viscous flow during exhumation. [ABSTRACT FROM AUTHOR]
Copyright of Terra Nova is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 7122773
AccessLevel: 6
PubType: Academic Journal
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  Data: Crustal-scale boudinage and migmatization of gneiss during their exhumation in the UHP Province of Western Norway.
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  Label: Abstract
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  Data: ABSTRACT A field study in the coesite province, the deepest unit of the Norwegian Caledonides, gives new constraints on the rheological behaviour of the continental crust during exhumation. Lithological heterogeneities and differential retrogression led to crustal-scale boudinage during the late-orogenic intense E–W stretching event in the footwall of the Nordfjord-Sogn Detachment. The main gneissic lithologies display a modest but widespread syn-exhumation migmatization. Textural criteria allow estimation of a 30% fusion rate. Partial melting mostly post-dates eclogitization and is synchronous with ductile stretching and top-to-west shearing. Presented observations suggest that the melt reactions and migmatization resulted in a soft rheology. During subduction to ~ 100 km depth and subsequent exhumation, crustal viscosity can be reduced by up to four orders of magnitude. Models are discussed that consider a transition from a small internal strain of the crust to viscous flow during exhumation. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Terra Nova is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1046/j.1365-3121.2002.00422.x
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 263
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        Type: general
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              Text: Aug2002
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