Structural constraints on the formation of Cu-rich mesothermal vein deposits in the Repparfjord Tectonic Window, northern Norway
The Paleoproterozoic metasupracrustal sequence of the Repparfjord Tectonic Window (RTW) within the Caledonian Nappe System in northern Norway hosts several Cu-bearing mesothermal carbonate-quartz veins. Structural analysis shows that the emplacement of the veins is geometrically and kinematically co...
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ftunibolognairis:oai:cris.unibo.it:11585/569743 2024-09-15T18:25:48+00:00 Structural constraints on the formation of Cu-rich mesothermal vein deposits in the Repparfjord Tectonic Window, northern Norway Torgersen, E. Sandstad, J. S. Stein, H. VIOLA, GIULIO Torgersen, E. Viola, Giulio Sandstad, J. S. Stein, H. 2013 STAMPA http://hdl.handle.net/11585/569743 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000337983900334 ispartofbook:Mineral Deposit Research for a High-Tech World 12th SGA Biennial Meeting firstpage:1323 lastpage:1326 numberofpages:4 http://hdl.handle.net/11585/569743 Mineral resources info:eu-repo/semantics/conferenceObject 2013 ftunibolognairis 2024-07-08T14:06:46Z The Paleoproterozoic metasupracrustal sequence of the Repparfjord Tectonic Window (RTW) within the Caledonian Nappe System in northern Norway hosts several Cu-bearing mesothermal carbonate-quartz veins. Structural analysis shows that the emplacement of the veins is geometrically and kinematically compatible with a phase of NW-SE shortening. Northwest- and southeast-dipping veins are related to brittle-ductile thrust faults, whereas sub-vertical E-W to NE-SW striking veins show a strong component of dextral strike-slip ductile shearing. It is proposed that the veins were emplaced under brittle-ductile conditions in a dextral transpressional shear corridor. Fluid overpressuring possibly led to fracturing of the host greenstones. The subsequent pressure drop led to metal precipitation. The newly-formed veins, which remained weaker than the surrounding metabasalts, localized subsequent fluid circulation and ductile strain increments. Coaxial NW-SE compression is reported for both the Paleoproterozoic Svecofennian and the Silurian Caledonian orogenies. Re-Os analysis on sulfides is in progress and will provide constraints on the age of both vein formation and associated tectonic stress regime. Conference Object Northern Norway IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
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IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
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English |
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Mineral resources |
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Mineral resources Torgersen, E. Sandstad, J. S. Stein, H. VIOLA, GIULIO Structural constraints on the formation of Cu-rich mesothermal vein deposits in the Repparfjord Tectonic Window, northern Norway |
topic_facet |
Mineral resources |
description |
The Paleoproterozoic metasupracrustal sequence of the Repparfjord Tectonic Window (RTW) within the Caledonian Nappe System in northern Norway hosts several Cu-bearing mesothermal carbonate-quartz veins. Structural analysis shows that the emplacement of the veins is geometrically and kinematically compatible with a phase of NW-SE shortening. Northwest- and southeast-dipping veins are related to brittle-ductile thrust faults, whereas sub-vertical E-W to NE-SW striking veins show a strong component of dextral strike-slip ductile shearing. It is proposed that the veins were emplaced under brittle-ductile conditions in a dextral transpressional shear corridor. Fluid overpressuring possibly led to fracturing of the host greenstones. The subsequent pressure drop led to metal precipitation. The newly-formed veins, which remained weaker than the surrounding metabasalts, localized subsequent fluid circulation and ductile strain increments. Coaxial NW-SE compression is reported for both the Paleoproterozoic Svecofennian and the Silurian Caledonian orogenies. Re-Os analysis on sulfides is in progress and will provide constraints on the age of both vein formation and associated tectonic stress regime. |
author2 |
Torgersen, E. Viola, Giulio Sandstad, J. S. Stein, H. |
format |
Conference Object |
author |
Torgersen, E. Sandstad, J. S. Stein, H. VIOLA, GIULIO |
author_facet |
Torgersen, E. Sandstad, J. S. Stein, H. VIOLA, GIULIO |
author_sort |
Torgersen, E. |
title |
Structural constraints on the formation of Cu-rich mesothermal vein deposits in the Repparfjord Tectonic Window, northern Norway |
title_short |
Structural constraints on the formation of Cu-rich mesothermal vein deposits in the Repparfjord Tectonic Window, northern Norway |
title_full |
Structural constraints on the formation of Cu-rich mesothermal vein deposits in the Repparfjord Tectonic Window, northern Norway |
title_fullStr |
Structural constraints on the formation of Cu-rich mesothermal vein deposits in the Repparfjord Tectonic Window, northern Norway |
title_full_unstemmed |
Structural constraints on the formation of Cu-rich mesothermal vein deposits in the Repparfjord Tectonic Window, northern Norway |
title_sort |
structural constraints on the formation of cu-rich mesothermal vein deposits in the repparfjord tectonic window, northern norway |
publishDate |
2013 |
url |
http://hdl.handle.net/11585/569743 |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000337983900334 ispartofbook:Mineral Deposit Research for a High-Tech World 12th SGA Biennial Meeting firstpage:1323 lastpage:1326 numberofpages:4 http://hdl.handle.net/11585/569743 |
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1810466279071416320 |