Geochronological studies in the Northern Scandinavian Caledonides, Finnmark Province, Northern Norway, new evidence for Grenvillian and Scandian components in the Kalak Nappe complex and the extent of the Mageroy Nappe
Faculty of Science School of Geoscience 0313950n madgerber@yahoo.com U-Pb ID-TIMS ages are reported for several magmatic and anatectic phases from the Kalak Nappe Complex (KNC), northern Norwegian Scandinavian Caledonides. Euhedral prismatic zircons from a suite of plutons intruding the metaturbidit...
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ftunivwitwaters:oai:wiredspace.wits.ac.za:10539/1716 2023-06-11T04:11:42+02:00 Geochronological studies in the Northern Scandinavian Caledonides, Finnmark Province, Northern Norway, new evidence for Grenvillian and Scandian components in the Kalak Nappe complex and the extent of the Mageroy Nappe Gerber, Madelein 2006-11-14T13:21:00Z 7028867 bytes 26921287 bytes 126589 bytes application/pdf http://hdl.handle.net/10539/1716 en eng http://hdl.handle.net/10539/1716 KNC Scandinavian Greville Scandian Mageroy Nappe Thesis 2006 ftunivwitwaters 2023-05-15T10:24:20Z Faculty of Science School of Geoscience 0313950n madgerber@yahoo.com U-Pb ID-TIMS ages are reported for several magmatic and anatectic phases from the Kalak Nappe Complex (KNC), northern Norwegian Scandinavian Caledonides. Euhedral prismatic zircons from a suite of plutons intruding the metaturbidite sequences of the Hellefjord Group, Sørøy-Seiland Nappe (upper KNC) yielded intrusion ages of 440.9 ± 1.5 Ma for a syenogranite, and 435.9 ± 1.6 Ma and 436.7 ±0.8 Ma, respectively, for a granite and gabbro. The period of magmatic activity was followed closely by a phase of deformation associated with upper amphibolite-granulite facies metamorphism at c. 430 Ma. This caused local anatexis in the granite and growth of magmatic zircon (429.5 ± 1.4 Ma), as well as the common growth of metamorphic titanite (431.4 ± 1 Ma and 427.8 ±2.7 Ma). These late Ordovician-early Silurian ages link this tectonometamorphic activity to the Scandian phase of the Scandinavian Caledonian orogeny. Evidence for Scandian tectonometamorphic activity is also recorded at c. 425 Ma in the Klubben Group of the Olderfjord Nappe (lower KNC). This is documented by the intrusion of a granodiorite pegmatite (425.9 ±0.7 Ma) and anatexis of the Klubben Group (425.5 ± 1.3 Ma). In addition, the Klubben Group records a c. 980 Ma Grenvillian age for anatectic veins crosscutting an earlier fabric (980.9 ± 2.6 Ma, syenogranitic leucosome), linking the initial evolution of the Klubben Group to the amalgamation of Rodinia. It is suggested that a previously undetected structural break exists in the Sørøy Succession of the KNC at base of the Hellefjord Group. This is supported by c. 441-436 Ma Scandian ages obtained for bimodal magmatic activity in the Hellefjord, which does not relate to the intrusion of the SIP further down in the Sørøy Succession at c. 570-560 and c. 530-520 Ma. In addition, Scandian magmatic ages have not been detected in the Sørøy Succession underlying the Hellefjord Group. However, these ages are coeval with bimodal plutons in the ... Thesis Finnmark Northern Norway Finnmark University of the Witwatersrand, Johannesburg: WITS Institutional Repository on DSpace (WIReDSpace) Kalak ENVELOPE(27.055,27.055,70.611,70.611) Norway Olderfjord ENVELOPE(21.482,21.482,70.175,70.175) Seiland ENVELOPE(23.275,23.275,70.430,70.430) Sørøy ENVELOPE(13.933,13.933,67.417,67.417) |
institution |
Open Polar |
collection |
University of the Witwatersrand, Johannesburg: WITS Institutional Repository on DSpace (WIReDSpace) |
op_collection_id |
ftunivwitwaters |
language |
English |
topic |
KNC Scandinavian Greville Scandian Mageroy Nappe |
spellingShingle |
KNC Scandinavian Greville Scandian Mageroy Nappe Gerber, Madelein Geochronological studies in the Northern Scandinavian Caledonides, Finnmark Province, Northern Norway, new evidence for Grenvillian and Scandian components in the Kalak Nappe complex and the extent of the Mageroy Nappe |
topic_facet |
KNC Scandinavian Greville Scandian Mageroy Nappe |
description |
Faculty of Science School of Geoscience 0313950n madgerber@yahoo.com U-Pb ID-TIMS ages are reported for several magmatic and anatectic phases from the Kalak Nappe Complex (KNC), northern Norwegian Scandinavian Caledonides. Euhedral prismatic zircons from a suite of plutons intruding the metaturbidite sequences of the Hellefjord Group, Sørøy-Seiland Nappe (upper KNC) yielded intrusion ages of 440.9 ± 1.5 Ma for a syenogranite, and 435.9 ± 1.6 Ma and 436.7 ±0.8 Ma, respectively, for a granite and gabbro. The period of magmatic activity was followed closely by a phase of deformation associated with upper amphibolite-granulite facies metamorphism at c. 430 Ma. This caused local anatexis in the granite and growth of magmatic zircon (429.5 ± 1.4 Ma), as well as the common growth of metamorphic titanite (431.4 ± 1 Ma and 427.8 ±2.7 Ma). These late Ordovician-early Silurian ages link this tectonometamorphic activity to the Scandian phase of the Scandinavian Caledonian orogeny. Evidence for Scandian tectonometamorphic activity is also recorded at c. 425 Ma in the Klubben Group of the Olderfjord Nappe (lower KNC). This is documented by the intrusion of a granodiorite pegmatite (425.9 ±0.7 Ma) and anatexis of the Klubben Group (425.5 ± 1.3 Ma). In addition, the Klubben Group records a c. 980 Ma Grenvillian age for anatectic veins crosscutting an earlier fabric (980.9 ± 2.6 Ma, syenogranitic leucosome), linking the initial evolution of the Klubben Group to the amalgamation of Rodinia. It is suggested that a previously undetected structural break exists in the Sørøy Succession of the KNC at base of the Hellefjord Group. This is supported by c. 441-436 Ma Scandian ages obtained for bimodal magmatic activity in the Hellefjord, which does not relate to the intrusion of the SIP further down in the Sørøy Succession at c. 570-560 and c. 530-520 Ma. In addition, Scandian magmatic ages have not been detected in the Sørøy Succession underlying the Hellefjord Group. However, these ages are coeval with bimodal plutons in the ... |
format |
Thesis |
author |
Gerber, Madelein |
author_facet |
Gerber, Madelein |
author_sort |
Gerber, Madelein |
title |
Geochronological studies in the Northern Scandinavian Caledonides, Finnmark Province, Northern Norway, new evidence for Grenvillian and Scandian components in the Kalak Nappe complex and the extent of the Mageroy Nappe |
title_short |
Geochronological studies in the Northern Scandinavian Caledonides, Finnmark Province, Northern Norway, new evidence for Grenvillian and Scandian components in the Kalak Nappe complex and the extent of the Mageroy Nappe |
title_full |
Geochronological studies in the Northern Scandinavian Caledonides, Finnmark Province, Northern Norway, new evidence for Grenvillian and Scandian components in the Kalak Nappe complex and the extent of the Mageroy Nappe |
title_fullStr |
Geochronological studies in the Northern Scandinavian Caledonides, Finnmark Province, Northern Norway, new evidence for Grenvillian and Scandian components in the Kalak Nappe complex and the extent of the Mageroy Nappe |
title_full_unstemmed |
Geochronological studies in the Northern Scandinavian Caledonides, Finnmark Province, Northern Norway, new evidence for Grenvillian and Scandian components in the Kalak Nappe complex and the extent of the Mageroy Nappe |
title_sort |
geochronological studies in the northern scandinavian caledonides, finnmark province, northern norway, new evidence for grenvillian and scandian components in the kalak nappe complex and the extent of the mageroy nappe |
publishDate |
2006 |
url |
http://hdl.handle.net/10539/1716 |
long_lat |
ENVELOPE(27.055,27.055,70.611,70.611) ENVELOPE(21.482,21.482,70.175,70.175) ENVELOPE(23.275,23.275,70.430,70.430) ENVELOPE(13.933,13.933,67.417,67.417) |
geographic |
Kalak Norway Olderfjord Seiland Sørøy |
geographic_facet |
Kalak Norway Olderfjord Seiland Sørøy |
genre |
Finnmark Northern Norway Finnmark |
genre_facet |
Finnmark Northern Norway Finnmark |
op_relation |
http://hdl.handle.net/10539/1716 |
_version_ |
1768386932391280640 |