A four-phase model for the Sveconorwegian orogeny, SW Scandinavia
The Sveconorwegian orogenic belt resulted from collision between Fennoscandia and another major plate, possibly Amazonia, at the end of the Mesoproterozoic. The belt divides, from east to west, into a Paleoproterozoic Eastern Segment, and four mainly Mesoproterozoic terranes transported relative to...
Main Authors: | , , |
---|---|
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2008
|
Subjects: | |
Online Access: | http://hdl.handle.net/11585/567065 |
id |
ftunibolognairis:oai:cris.unibo.it:11585/567065 |
---|---|
record_format |
openpolar |
spelling |
ftunibolognairis:oai:cris.unibo.it:11585/567065 2024-05-19T07:40:07+00:00 A four-phase model for the Sveconorwegian orogeny, SW Scandinavia Bingen, B. Nordgulen, O. VIOLA, GIULIO Bingen, B. Nordgulen, O. Viola, Giulio 2008 STAMPA http://hdl.handle.net/11585/567065 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000255301900003 volume:88 firstpage:43 lastpage:72 numberofpages:30 journal:NORSK GEOLOGISK TIDSSKRIFT http://hdl.handle.net/11585/567065 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-54049110101 Sveconorwegian orogen Mesoproterozoic Scandinavia info:eu-repo/semantics/article 2008 ftunibolognairis 2024-04-19T00:14:30Z The Sveconorwegian orogenic belt resulted from collision between Fennoscandia and another major plate, possibly Amazonia, at the end of the Mesoproterozoic. The belt divides, from east to west, into a Paleoproterozoic Eastern Segment, and four mainly Mesoproterozoic terranes transported relative to Fennsocandia. These are the Idefjorden, Kongsberg, Bamble and Telemarkia Terranes. The Eastern Segment is lithologically related to the Transcandinavian Igneous Belt (TIB), in the Fennoscandian foreland of the belt. The terranes are possibly endemic to Fennoscandia, though an exotic origin for the Telemarkia Terrane is possible. A review of existing geological and geochronological data supports a four-phase Sveconorwegian assembly of these lithotectonic units. (1) At 1140-1080 Ma, the Arendal phase represents the collision between the Idefjorden and Telemarkia Terranes, which produced the Bamble and Kongsberg tectonic wedges. This phase involved closure of an oceanic basin, possibly marginal to Fennoscandia, accretion of a volcanic arc, high-grade metamorphism and deformation in the Bamble and Kongsberg Terranes peaking in granulite-facies conditions at 1140-1125 Ma, and thrusting of the Bamble Terrane onto the Telemarkia Terrane probably at c. 1090-1080 Ma. (2) At 1050-980 Ma, the Agder phase corresponds to the main Sveconorwegian oblique (?) continent-continent collision. It resulted in underthrusing and burial of the Idefjorden Terrane to high-pressure conditions at 1050 Ma, followed by exhumation. Crustal thickening in the Telemarkia Terrane led to protracted granite magmatism starting at 1050 Ma and to high-grade metamorphism starting at 1035 Ma. Metamorphism peaked in granulite facies conditions in the Rogaland-Vest Agder Sector. (3) At 980-970 Ma, the Falkenberg phase reflects final convergence in the belt, shortly followed by divergence. Foreland propagationof the orogeny is indicated by underthrusting of the Eastern Segment to eclogites facies conditions at c. 970 Ma. (4) Between 970 and 900 Ma, the Dalane ... Article in Journal/Newspaper Fennoscandia Fennoscandian IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
Sveconorwegian orogen Mesoproterozoic Scandinavia |
spellingShingle |
Sveconorwegian orogen Mesoproterozoic Scandinavia Bingen, B. Nordgulen, O. VIOLA, GIULIO A four-phase model for the Sveconorwegian orogeny, SW Scandinavia |
topic_facet |
Sveconorwegian orogen Mesoproterozoic Scandinavia |
description |
The Sveconorwegian orogenic belt resulted from collision between Fennoscandia and another major plate, possibly Amazonia, at the end of the Mesoproterozoic. The belt divides, from east to west, into a Paleoproterozoic Eastern Segment, and four mainly Mesoproterozoic terranes transported relative to Fennsocandia. These are the Idefjorden, Kongsberg, Bamble and Telemarkia Terranes. The Eastern Segment is lithologically related to the Transcandinavian Igneous Belt (TIB), in the Fennoscandian foreland of the belt. The terranes are possibly endemic to Fennoscandia, though an exotic origin for the Telemarkia Terrane is possible. A review of existing geological and geochronological data supports a four-phase Sveconorwegian assembly of these lithotectonic units. (1) At 1140-1080 Ma, the Arendal phase represents the collision between the Idefjorden and Telemarkia Terranes, which produced the Bamble and Kongsberg tectonic wedges. This phase involved closure of an oceanic basin, possibly marginal to Fennoscandia, accretion of a volcanic arc, high-grade metamorphism and deformation in the Bamble and Kongsberg Terranes peaking in granulite-facies conditions at 1140-1125 Ma, and thrusting of the Bamble Terrane onto the Telemarkia Terrane probably at c. 1090-1080 Ma. (2) At 1050-980 Ma, the Agder phase corresponds to the main Sveconorwegian oblique (?) continent-continent collision. It resulted in underthrusing and burial of the Idefjorden Terrane to high-pressure conditions at 1050 Ma, followed by exhumation. Crustal thickening in the Telemarkia Terrane led to protracted granite magmatism starting at 1050 Ma and to high-grade metamorphism starting at 1035 Ma. Metamorphism peaked in granulite facies conditions in the Rogaland-Vest Agder Sector. (3) At 980-970 Ma, the Falkenberg phase reflects final convergence in the belt, shortly followed by divergence. Foreland propagationof the orogeny is indicated by underthrusting of the Eastern Segment to eclogites facies conditions at c. 970 Ma. (4) Between 970 and 900 Ma, the Dalane ... |
author2 |
Bingen, B. Nordgulen, O. Viola, Giulio |
format |
Article in Journal/Newspaper |
author |
Bingen, B. Nordgulen, O. VIOLA, GIULIO |
author_facet |
Bingen, B. Nordgulen, O. VIOLA, GIULIO |
author_sort |
Bingen, B. |
title |
A four-phase model for the Sveconorwegian orogeny, SW Scandinavia |
title_short |
A four-phase model for the Sveconorwegian orogeny, SW Scandinavia |
title_full |
A four-phase model for the Sveconorwegian orogeny, SW Scandinavia |
title_fullStr |
A four-phase model for the Sveconorwegian orogeny, SW Scandinavia |
title_full_unstemmed |
A four-phase model for the Sveconorwegian orogeny, SW Scandinavia |
title_sort |
four-phase model for the sveconorwegian orogeny, sw scandinavia |
publishDate |
2008 |
url |
http://hdl.handle.net/11585/567065 |
genre |
Fennoscandia Fennoscandian |
genre_facet |
Fennoscandia Fennoscandian |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000255301900003 volume:88 firstpage:43 lastpage:72 numberofpages:30 journal:NORSK GEOLOGISK TIDSSKRIFT http://hdl.handle.net/11585/567065 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-54049110101 |
_version_ |
1799479681575026688 |