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Exhumation of high-pressure rocks beneath the Solund Basin, Western Gneiss Region of Norway

Journal of Metamorphic Geology

By:
, , , , ,
DOI: 10.1046/j.1525-1314.2003.00468.x

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Abstract

The Solund-Hyllestad-Lavik area affords an excellent opportunity to understand the ultrahigh-pressure Scandian orogeny because it contains a near-complete record of ophiolite emplacement, high-pressure metamorphism and large-scale extension. In this area, the Upper Allochthon was intruded by the c. 434 Ma Sogneskollen granodiorite and thrust eastward over the Middle/Lower Allochthon, probably in the Wenlockian. The Middle/Lower Allochthon was subducted to c. 50 km depth and the structurally lower Western Gneiss Complex was subducted to eclogite facies conditions at c. 80 km depth by c. 410-400 Ma. Within < 5-10 Myr, all these units were exhumed by the Nordfjord-Sogn detachment zone, producing shear strains > 100. Exhumation to upper crustal levels was complete by c. 403 Ma. The Solund fault produced the last few km of tectonic exhumation, bringing the near-ultrahigh-pressure rocks to within c. 3 km vertical distance from the low-grade Solund Conglomerate.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Exhumation of high-pressure rocks beneath the Solund Basin, Western Gneiss Region of Norway
Series title:
Journal of Metamorphic Geology
DOI:
10.1046/j.1525-1314.2003.00468.x
Volume
21
Issue:
6
Year Published:
2003
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Metamorphic Geology
First page:
613
Last page:
629
Number of Pages:
17