Exhumation of high-pressure rocks beneath the Solund Basin, Western Gneiss Region of Norway
Journal of Metamorphic Geology
By: B. R. Hacker, T.B. Andersen, D.B. Root, L. Mehl, J.M. Mattinson, and J. L. Wooden
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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.
| 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 |
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