Multiple post-Svecofennian 1750-1560 Ma pegmatite dykes in Archaean-Palaeoproterozoic rocks of the West Troms Basement Complex, North Norway: geological significance and regional implications
The West Troms Basement Complex, North Norway, consist of Meosarchaean, Neoarchaean and Palaeoproterozoic crust which likely represent the continuation of the Karelian craton of the Fennoscandian Shield beneath and across the Caledonian nappes. The complex is transected by several meta-sedimentary/v...
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ftunivnewcastnsw:uon:26620 2023-05-15T16:12:09+02:00 Multiple post-Svecofennian 1750-1560 Ma pegmatite dykes in Archaean-Palaeoproterozoic rocks of the West Troms Basement Complex, North Norway: geological significance and regional implications Bergh, S. G. Corfu, F. Priyatkina, Nadezhda Kullerud, K. Myhre, P. I. The University of Newcastle. Faculty of Science , School of Environmental and Life Sciences 2015 http://hdl.handle.net/1959.13/1331378 eng eng Elsevier Precambrian Research Vol. 266, Issue September 215, p. 425-439 10.1016/j.precamres.2015.05.035 U–Pb geochronology Granite pegmatites Fennoscandian Shield Mesoproterozoic Intracratonic deformation Laurentian margin journal article 2015 ftunivnewcastnsw 2018-07-27T00:58:45Z The West Troms Basement Complex, North Norway, consist of Meosarchaean, Neoarchaean and Palaeoproterozoic crust which likely represent the continuation of the Karelian craton of the Fennoscandian Shield beneath and across the Caledonian nappes. The complex is transected by several meta-sedimentary/volcanic belts with ages from ca. 2.7 to 1.9 Ga, and linear ductile shear zones that record polyphase deformation after emplacement of several late-Svecofennian plutonic complexes (1.80–1.79 Ga). The Astridal supracrustal belt of the Senja shear zone was intruded by various generations of granite pegmatite dykes, which yield zircon and titanite U–Pb ages ranging between 1758 and 1562 Ma, with evidence of a weak Caledonian overprint at about 400 Ma that formed or reset some, but not all, titanites. The age range indicates that formation of the pegmatites occurred after termination of the main Svecofennian orogeny (1.92–1.79 Ga) of the Karelian craton. Comparison within the larger scale context of the Fennoscandian Shield suggests that emplacement of these pegmatites may have been caused by late-stage reactivation of intracratonic shear zones, possibly reflecting distal effects of deeper magmatic processes such as intrusion of coeval aged rapakivi granite suites (ca. 1.65–1.5 Ga) in Finland, and/or the Mesoproterozoic Gothian orogeny and magmatism affecting the southwestern parts of Fennoscandia. The Mesoproterozoic ages, however, also correspond to late Laxfordian (ca. 1.7–1.6 Ga) tectonic events in the Lewisian basement on the Laurentian margin of Scotland, suggesting a potential early link between these basement complexes. Article in Journal/Newspaper Fennoscandia Fennoscandian karelia* karelian North Norway Senja Troms NOVA: The University of Newcastle Research Online (Australia) Norway Senja ENVELOPE(16.803,16.803,69.081,69.081) |
institution |
Open Polar |
collection |
NOVA: The University of Newcastle Research Online (Australia) |
op_collection_id |
ftunivnewcastnsw |
language |
English |
topic |
U–Pb geochronology Granite pegmatites Fennoscandian Shield Mesoproterozoic Intracratonic deformation Laurentian margin |
spellingShingle |
U–Pb geochronology Granite pegmatites Fennoscandian Shield Mesoproterozoic Intracratonic deformation Laurentian margin Bergh, S. G. Corfu, F. Priyatkina, Nadezhda Kullerud, K. Myhre, P. I. Multiple post-Svecofennian 1750-1560 Ma pegmatite dykes in Archaean-Palaeoproterozoic rocks of the West Troms Basement Complex, North Norway: geological significance and regional implications |
topic_facet |
U–Pb geochronology Granite pegmatites Fennoscandian Shield Mesoproterozoic Intracratonic deformation Laurentian margin |
description |
The West Troms Basement Complex, North Norway, consist of Meosarchaean, Neoarchaean and Palaeoproterozoic crust which likely represent the continuation of the Karelian craton of the Fennoscandian Shield beneath and across the Caledonian nappes. The complex is transected by several meta-sedimentary/volcanic belts with ages from ca. 2.7 to 1.9 Ga, and linear ductile shear zones that record polyphase deformation after emplacement of several late-Svecofennian plutonic complexes (1.80–1.79 Ga). The Astridal supracrustal belt of the Senja shear zone was intruded by various generations of granite pegmatite dykes, which yield zircon and titanite U–Pb ages ranging between 1758 and 1562 Ma, with evidence of a weak Caledonian overprint at about 400 Ma that formed or reset some, but not all, titanites. The age range indicates that formation of the pegmatites occurred after termination of the main Svecofennian orogeny (1.92–1.79 Ga) of the Karelian craton. Comparison within the larger scale context of the Fennoscandian Shield suggests that emplacement of these pegmatites may have been caused by late-stage reactivation of intracratonic shear zones, possibly reflecting distal effects of deeper magmatic processes such as intrusion of coeval aged rapakivi granite suites (ca. 1.65–1.5 Ga) in Finland, and/or the Mesoproterozoic Gothian orogeny and magmatism affecting the southwestern parts of Fennoscandia. The Mesoproterozoic ages, however, also correspond to late Laxfordian (ca. 1.7–1.6 Ga) tectonic events in the Lewisian basement on the Laurentian margin of Scotland, suggesting a potential early link between these basement complexes. |
author2 |
The University of Newcastle. Faculty of Science , School of Environmental and Life Sciences |
format |
Article in Journal/Newspaper |
author |
Bergh, S. G. Corfu, F. Priyatkina, Nadezhda Kullerud, K. Myhre, P. I. |
author_facet |
Bergh, S. G. Corfu, F. Priyatkina, Nadezhda Kullerud, K. Myhre, P. I. |
author_sort |
Bergh, S. G. |
title |
Multiple post-Svecofennian 1750-1560 Ma pegmatite dykes in Archaean-Palaeoproterozoic rocks of the West Troms Basement Complex, North Norway: geological significance and regional implications |
title_short |
Multiple post-Svecofennian 1750-1560 Ma pegmatite dykes in Archaean-Palaeoproterozoic rocks of the West Troms Basement Complex, North Norway: geological significance and regional implications |
title_full |
Multiple post-Svecofennian 1750-1560 Ma pegmatite dykes in Archaean-Palaeoproterozoic rocks of the West Troms Basement Complex, North Norway: geological significance and regional implications |
title_fullStr |
Multiple post-Svecofennian 1750-1560 Ma pegmatite dykes in Archaean-Palaeoproterozoic rocks of the West Troms Basement Complex, North Norway: geological significance and regional implications |
title_full_unstemmed |
Multiple post-Svecofennian 1750-1560 Ma pegmatite dykes in Archaean-Palaeoproterozoic rocks of the West Troms Basement Complex, North Norway: geological significance and regional implications |
title_sort |
multiple post-svecofennian 1750-1560 ma pegmatite dykes in archaean-palaeoproterozoic rocks of the west troms basement complex, north norway: geological significance and regional implications |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://hdl.handle.net/1959.13/1331378 |
long_lat |
ENVELOPE(16.803,16.803,69.081,69.081) |
geographic |
Norway Senja |
geographic_facet |
Norway Senja |
genre |
Fennoscandia Fennoscandian karelia* karelian North Norway Senja Troms |
genre_facet |
Fennoscandia Fennoscandian karelia* karelian North Norway Senja Troms |
op_relation |
Precambrian Research Vol. 266, Issue September 215, p. 425-439 10.1016/j.precamres.2015.05.035 |
_version_ |
1765997402614923264 |