Grenvillian U-Pb zircon ages of quartz porphyry and rhyolite clasts in a metaconglomerate at Vimsodden, southwestern Spitsbergen
Proterozoic metasupracrustal rocks form a NNW-SSE trending basement zone along the western coast of Spitsbergen. The rocks show complex structures as a result of both Caledonian and Tertiary deformation, and most of the subordinate metaigneous rocks are not suitable for isotopic age determination. S...
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Norwegian Polar Institute
1995
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ftjpolarres:oai:journals.openacademia.net:article/1953 2023-05-15T16:34:57+02:00 Grenvillian U-Pb zircon ages of quartz porphyry and rhyolite clasts in a metaconglomerate at Vimsodden, southwestern Spitsbergen Balašov, Ju. A. Teben'kov, A. M. Ohta, Y. Larionov, A. N. Sirotkin, A. N. Gannibal, L. F. Ryungenen, G. I. 1995-01-12 application/pdf https://polarresearch.net/index.php/polar/article/view/1953 https://doi.org/10.3402/polar.v14i3.6669 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/1953/5202 https://polarresearch.net/index.php/polar/article/view/1953 doi:10.3402/polar.v14i3.6669 Copyright (c) 2018 Polar Research Polar Research; Vol. 14 No. 3 (1995); 291-302 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1995 ftjpolarres https://doi.org/10.3402/polar.v14i3.6669 2021-11-11T19:11:42Z Proterozoic metasupracrustal rocks form a NNW-SSE trending basement zone along the western coast of Spitsbergen. The rocks show complex structures as a result of both Caledonian and Tertiary deformation, and most of the subordinate metaigneous rocks are not suitable for isotopic age determination. Some zircon-bearing rocks were found in the southwestern part of Spitsbergen and an attempt of U-Pb dating was performed. U-Pb dating was carried out on zircon fractions from quartz porphyry and rhyolite clasts in a metaconglomerate unit of the Pyttholmen Formation northwest of Hornsund, southwestern Spitsbergen. The Pyttholmen Formation is considered to be a lateral equivalent of the upper part of the Gulliksenfjellet quartzite and in the same time as the upper part of the Skålfjellet metavolcanites. Therefore, the obtained ages are applicable to the age of the Skålfjellet igneous activities. Some of the dated samples are strongly schistose and their magmatic origin is difficult to confirm; the interpretation of the isotopic results is not well constrained; however, some explanations are possible which refer to the known geological conditions; an igneous age of siliceous volcanic rocks of ca. 1200 Ma, inherited zircon ages of ca. 2500 Ma and a regional metamorphic age of ca. 930 Ma. The last age belongs to the Grenvillian period and is conformable with the Rb/Sr whole rock age obtained from the garnet-biotite schists of the Isbjernhamna Group underlying the Skålfjellet metavolcanites. Article in Journal/Newspaper Hornsund Polar Research Spitsbergen Polar Research (E-Journal) Hornsund ENVELOPE(15.865,15.865,76.979,76.979) Pyttholmen ENVELOPE(15.052,15.052,77.099,77.099) Skålfjellet ENVELOPE(15.473,15.473,77.044,77.044) Vimsodden ENVELOPE(15.041,15.041,77.109,77.109) Polar Research 14 3 291 302 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
Proterozoic metasupracrustal rocks form a NNW-SSE trending basement zone along the western coast of Spitsbergen. The rocks show complex structures as a result of both Caledonian and Tertiary deformation, and most of the subordinate metaigneous rocks are not suitable for isotopic age determination. Some zircon-bearing rocks were found in the southwestern part of Spitsbergen and an attempt of U-Pb dating was performed. U-Pb dating was carried out on zircon fractions from quartz porphyry and rhyolite clasts in a metaconglomerate unit of the Pyttholmen Formation northwest of Hornsund, southwestern Spitsbergen. The Pyttholmen Formation is considered to be a lateral equivalent of the upper part of the Gulliksenfjellet quartzite and in the same time as the upper part of the Skålfjellet metavolcanites. Therefore, the obtained ages are applicable to the age of the Skålfjellet igneous activities. Some of the dated samples are strongly schistose and their magmatic origin is difficult to confirm; the interpretation of the isotopic results is not well constrained; however, some explanations are possible which refer to the known geological conditions; an igneous age of siliceous volcanic rocks of ca. 1200 Ma, inherited zircon ages of ca. 2500 Ma and a regional metamorphic age of ca. 930 Ma. The last age belongs to the Grenvillian period and is conformable with the Rb/Sr whole rock age obtained from the garnet-biotite schists of the Isbjernhamna Group underlying the Skålfjellet metavolcanites. |
format |
Article in Journal/Newspaper |
author |
Balašov, Ju. A. Teben'kov, A. M. Ohta, Y. Larionov, A. N. Sirotkin, A. N. Gannibal, L. F. Ryungenen, G. I. |
spellingShingle |
Balašov, Ju. A. Teben'kov, A. M. Ohta, Y. Larionov, A. N. Sirotkin, A. N. Gannibal, L. F. Ryungenen, G. I. Grenvillian U-Pb zircon ages of quartz porphyry and rhyolite clasts in a metaconglomerate at Vimsodden, southwestern Spitsbergen |
author_facet |
Balašov, Ju. A. Teben'kov, A. M. Ohta, Y. Larionov, A. N. Sirotkin, A. N. Gannibal, L. F. Ryungenen, G. I. |
author_sort |
Balašov, Ju. A. |
title |
Grenvillian U-Pb zircon ages of quartz porphyry and rhyolite clasts in a metaconglomerate at Vimsodden, southwestern Spitsbergen |
title_short |
Grenvillian U-Pb zircon ages of quartz porphyry and rhyolite clasts in a metaconglomerate at Vimsodden, southwestern Spitsbergen |
title_full |
Grenvillian U-Pb zircon ages of quartz porphyry and rhyolite clasts in a metaconglomerate at Vimsodden, southwestern Spitsbergen |
title_fullStr |
Grenvillian U-Pb zircon ages of quartz porphyry and rhyolite clasts in a metaconglomerate at Vimsodden, southwestern Spitsbergen |
title_full_unstemmed |
Grenvillian U-Pb zircon ages of quartz porphyry and rhyolite clasts in a metaconglomerate at Vimsodden, southwestern Spitsbergen |
title_sort |
grenvillian u-pb zircon ages of quartz porphyry and rhyolite clasts in a metaconglomerate at vimsodden, southwestern spitsbergen |
publisher |
Norwegian Polar Institute |
publishDate |
1995 |
url |
https://polarresearch.net/index.php/polar/article/view/1953 https://doi.org/10.3402/polar.v14i3.6669 |
long_lat |
ENVELOPE(15.865,15.865,76.979,76.979) ENVELOPE(15.052,15.052,77.099,77.099) ENVELOPE(15.473,15.473,77.044,77.044) ENVELOPE(15.041,15.041,77.109,77.109) |
geographic |
Hornsund Pyttholmen Skålfjellet Vimsodden |
geographic_facet |
Hornsund Pyttholmen Skålfjellet Vimsodden |
genre |
Hornsund Polar Research Spitsbergen |
genre_facet |
Hornsund Polar Research Spitsbergen |
op_source |
Polar Research; Vol. 14 No. 3 (1995); 291-302 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/1953/5202 https://polarresearch.net/index.php/polar/article/view/1953 doi:10.3402/polar.v14i3.6669 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v14i3.6669 |
container_title |
Polar Research |
container_volume |
14 |
container_issue |
3 |
container_start_page |
291 |
op_container_end_page |
302 |
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1766025053879664640 |