| Reference Type | Journal (article/letter/editorial) |
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| Access Rights | Open Access |
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| Title | Structural and metamorphic history of the Engebøfjellet Eclogite and the exhumation of the Western Gneiss Region, Norway |
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| Journal | Norwegian Journal of Geology - Norsk Geologisk Tidsskrift | ISSN | 2387-5852 |
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| Authors | Braathen, Alvar | Author |
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| Erambert, Muriel | Author |
| Year | 2014 | Volume | 94 |
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| Page(s) | 53-76 | Issue | 1 |
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| Publisher | Geological Society of Norway |
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| Download URL | https://njg.geologi.no/images/NJG_articles/NJG_1_Vol94_Braathen_pr.pdf+ |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16906290 | Long-form Identifier | mindat:1:5:16906290:5 |
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| GUID | e9311156-6fbe-42ee-afa5-e622238d63b0 |
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| Full Reference | Braathen, Alvar, Erambert, Muriel (2014) Structural and metamorphic history of the Engebøfjellet Eclogite and the exhumation of the Western Gneiss Region, Norway. Norwegian Journal of Geology - Norsk Geologisk Tidsskrift, 94 (1) 53-76 |
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| Plain Text | Braathen, Alvar, Erambert, Muriel (2014) Structural and metamorphic history of the Engebøfjellet Eclogite and the exhumation of the Western Gneiss Region, Norway. Norwegian Journal of Geology - Norsk Geologisk Tidsskrift, 94 (1) 53-76 |
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| In | (2014) Norwegian Journal of Geology - Norsk Geologisk Tidsskrift Vol. 94 (1) Geological Society of Norway |
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| Abstract/Notes | Crustal-scale extensional denudation and exhumation of crustal roots in mountain belts have a complex evolution, as can be documented for the Engebøfjellet Eclogite of the Western Gneiss Region, Norway. This eclogite is situated in a large antiform below the major extensional Nordfjord– Sogn Detachment, with an unroofing history attesting to six events; (Phases D1–2) complete HP eclogitisation of a gabbroic complex during vertical shortening and horizontal E–W stretching. (D3–4) Retrogression along amphibolite- and greenschist-facies structures signifying highly ductile top-W shear. (D5–6) Following folding, earlier structures were cut during top-W shear on the Nordfjord–Sogn Detachment, prior to renewed regional E–W folding. The P–T path points to rapid near-isothermal decompression from c. 17 to 7 kbar (D1 to D4 ), followed by a period of cooling from 525°C to ?300°C (brittle conditions; D5 and D6 ) during a pressure decrease of 3–4 kbar. During extension, exhumation of the crust within a growing major antiform parallel to tectonic transport was caused by either (i) repeated locking and unlocking of extensional detachment(s) that alternated with folding from transpression-transtension events on the major Møre–Trøndelag Fault Complex, or (ii) progressive folding interacting with extensional shear zones along crustal boundary layers. |
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