Grenvillian single-grain zircon Pb age of a granitic rock from the southern island of Hesteskoholmen, Liefdefjorden, northwestern Spitsbergen, Svalbard
A N-S trending, narrow zone of crystalline basement occurs from Biscayarhalvøya to Holtedahlfonna in northwestern Spitsbergen and is composed of various metasedimentary and igneous rocks, including granites. Previous isotopic age determinations on these rocks are by the K-Ar. Rb-Sr, 40Ar/39Ar and co...
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ftjpolarres:oai:journals.openacademia.net:article/2271 2023-05-15T17:08:02+02:00 Grenvillian single-grain zircon Pb age of a granitic rock from the southern island of Hesteskoholmen, Liefdefjorden, northwestern Spitsbergen, Svalbard Ohta, Yoshihide Larionov, Aleksandr N. 1998-01-12 application/pdf https://polarresearch.net/index.php/polar/article/view/2271 https://doi.org/10.3402/polar.v17i2.6615 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2271/5522 https://polarresearch.net/index.php/polar/article/view/2271 doi:10.3402/polar.v17i2.6615 Copyright (c) 2018 Polar Research Polar Research; Vol. 17 No. 2 (1998); 147-154 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1998 ftjpolarres https://doi.org/10.3402/polar.v17i2.6615 2021-11-11T19:12:21Z A N-S trending, narrow zone of crystalline basement occurs from Biscayarhalvøya to Holtedahlfonna in northwestern Spitsbergen and is composed of various metasedimentary and igneous rocks, including granites. Previous isotopic age determinations on these rocks are by the K-Ar. Rb-Sr, 40Ar/39Ar and conventional zircon U-Pb method and yielded the Caledonian and Grenvillian ages. The single-grain zircon Pb evaporation method has recently been applied to solve complex problems and this is the first report by the method. A granitic rock, syntectonically intruded into the phyllitic metasediments of the Biscayarhuken formation, which is the uppermost lithotectonic unit in the metamorphic rocks of the zone, was dated on four zircon grains, yielding a narrow age range from 955 ± 4 to 968 ± 9 Ma in average. This age of ca. 960 Ma is considered to be the age of intrusion, based on the occurrence and zircon morphology, which is roughly simultaneous with the formation of the phyllitic cleavages of the surrounding metasediments. The data obtained imply that the Caledonian events did not reset the Pb isotope system of zircon and major metamorphism occurred during the Grenvillian time in the Biscayarhuken formation, accordingly, the protolith age of the metasediments is Mesoproterozoic. Article in Journal/Newspaper Liefdefjord* Polar Research Svalbard Spitsbergen Polar Research (E-Journal) Svalbard Holtedahlfonna ENVELOPE(13.730,13.730,79.011,79.011) Liefdefjorden ENVELOPE(13.667,13.667,79.617,79.617) Southern Island ENVELOPE(-55.577,-55.577,52.266,52.266) Polar Research 17 2 147 154 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
A N-S trending, narrow zone of crystalline basement occurs from Biscayarhalvøya to Holtedahlfonna in northwestern Spitsbergen and is composed of various metasedimentary and igneous rocks, including granites. Previous isotopic age determinations on these rocks are by the K-Ar. Rb-Sr, 40Ar/39Ar and conventional zircon U-Pb method and yielded the Caledonian and Grenvillian ages. The single-grain zircon Pb evaporation method has recently been applied to solve complex problems and this is the first report by the method. A granitic rock, syntectonically intruded into the phyllitic metasediments of the Biscayarhuken formation, which is the uppermost lithotectonic unit in the metamorphic rocks of the zone, was dated on four zircon grains, yielding a narrow age range from 955 ± 4 to 968 ± 9 Ma in average. This age of ca. 960 Ma is considered to be the age of intrusion, based on the occurrence and zircon morphology, which is roughly simultaneous with the formation of the phyllitic cleavages of the surrounding metasediments. The data obtained imply that the Caledonian events did not reset the Pb isotope system of zircon and major metamorphism occurred during the Grenvillian time in the Biscayarhuken formation, accordingly, the protolith age of the metasediments is Mesoproterozoic. |
format |
Article in Journal/Newspaper |
author |
Ohta, Yoshihide Larionov, Aleksandr N. |
spellingShingle |
Ohta, Yoshihide Larionov, Aleksandr N. Grenvillian single-grain zircon Pb age of a granitic rock from the southern island of Hesteskoholmen, Liefdefjorden, northwestern Spitsbergen, Svalbard |
author_facet |
Ohta, Yoshihide Larionov, Aleksandr N. |
author_sort |
Ohta, Yoshihide |
title |
Grenvillian single-grain zircon Pb age of a granitic rock from the southern island of Hesteskoholmen, Liefdefjorden, northwestern Spitsbergen, Svalbard |
title_short |
Grenvillian single-grain zircon Pb age of a granitic rock from the southern island of Hesteskoholmen, Liefdefjorden, northwestern Spitsbergen, Svalbard |
title_full |
Grenvillian single-grain zircon Pb age of a granitic rock from the southern island of Hesteskoholmen, Liefdefjorden, northwestern Spitsbergen, Svalbard |
title_fullStr |
Grenvillian single-grain zircon Pb age of a granitic rock from the southern island of Hesteskoholmen, Liefdefjorden, northwestern Spitsbergen, Svalbard |
title_full_unstemmed |
Grenvillian single-grain zircon Pb age of a granitic rock from the southern island of Hesteskoholmen, Liefdefjorden, northwestern Spitsbergen, Svalbard |
title_sort |
grenvillian single-grain zircon pb age of a granitic rock from the southern island of hesteskoholmen, liefdefjorden, northwestern spitsbergen, svalbard |
publisher |
Norwegian Polar Institute |
publishDate |
1998 |
url |
https://polarresearch.net/index.php/polar/article/view/2271 https://doi.org/10.3402/polar.v17i2.6615 |
long_lat |
ENVELOPE(13.730,13.730,79.011,79.011) ENVELOPE(13.667,13.667,79.617,79.617) ENVELOPE(-55.577,-55.577,52.266,52.266) |
geographic |
Svalbard Holtedahlfonna Liefdefjorden Southern Island |
geographic_facet |
Svalbard Holtedahlfonna Liefdefjorden Southern Island |
genre |
Liefdefjord* Polar Research Svalbard Spitsbergen |
genre_facet |
Liefdefjord* Polar Research Svalbard Spitsbergen |
op_source |
Polar Research; Vol. 17 No. 2 (1998); 147-154 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2271/5522 https://polarresearch.net/index.php/polar/article/view/2271 doi:10.3402/polar.v17i2.6615 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v17i2.6615 |
container_title |
Polar Research |
container_volume |
17 |
container_issue |
2 |
container_start_page |
147 |
op_container_end_page |
154 |
_version_ |
1766063579519254528 |