Pb-Pb single-zircon single grain ages of granitoid boulders from the Vendian tillite of Wahlenbergfjorden, Nordaustlandet, Svalbard
There are three areas in eastern Svalbard where Vendian tillites are exposed: eastern Ny Friesland, western Nordaustlandet (north and south of Murchisonfjorden) and further east in inner Wahlenbergfjorden, near Aldousbreen. Clasts within the massive unmetamorphosed clay-mica-carbonate matrix of the...
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Norwegian Polar Institute
1998
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ftjpolarres:oai:journals.openacademia.net:article/2264 2023-05-15T15:33:56+02:00 Pb-Pb single-zircon single grain ages of granitoid boulders from the Vendian tillite of Wahlenbergfjorden, Nordaustlandet, Svalbard Larionov, Alexander N. Tebenkov, Alexander M. Gee, David G. 1998-01-06 application/pdf https://polarresearch.net/index.php/polar/article/view/2264 https://doi.org/10.3402/polar.v17i1.6608 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2264/5515 https://polarresearch.net/index.php/polar/article/view/2264 doi:10.3402/polar.v17i1.6608 Copyright (c) 2018 Polar Research Polar Research; Vol. 17 No. 1 (1998); 71-80 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1998 ftjpolarres https://doi.org/10.3402/polar.v17i1.6608 2021-11-11T19:12:21Z There are three areas in eastern Svalbard where Vendian tillites are exposed: eastern Ny Friesland, western Nordaustlandet (north and south of Murchisonfjorden) and further east in inner Wahlenbergfjorden, near Aldousbreen. Clasts within the massive unmetamorphosed clay-mica-carbonate matrix of the tillites include carbonates, sandstones, siltstones, metavolcanics, schists and different granitoids, the metamorphic and igneous rock types being more frequent in the upper levels of the formation. Large granite boulders, up to 1 m in diameter, are known from the easternmost outcrop at Aldousbreen. Three granitoid boulders from the Aldousbreen outcrop, differing in petrography and chemistry. have been dated by the Pb-Pb singlezircon method. They yield ages of 2830 ± 5 Ma, 1802 ± 4 Ma and 1497 ± 26 Ma. These clasts also differ in petrography, chemistry and age from all known granitic rocks on Nordaustlandet, which have recently yielded Grenvillian (950-960 Ma) and Caledonian (ca. 410 Ma) ages. The concentration of large granitic clasts in the easternmost known tillite outcrops suggests derivation from the east and/or south. Possible areas include those beneath the ice of Austfonna and below the Carboniferous strata of southeastem Nordaustlandet. The apparent lack of a significant Grenvillian overprint suggests the possibility of a more distant source. Article in Journal/Newspaper Austfonna Nordaustlandet Ny Friesland Polar Research Svalbard Polar Research (E-Journal) Svalbard Nordaustlandet ENVELOPE(22.400,22.400,79.800,79.800) Austfonna ENVELOPE(24.559,24.559,79.835,79.835) Ny Friesland ENVELOPE(16.847,16.847,79.498,79.498) Murchisonfjorden ENVELOPE(18.429,18.429,79.986,79.986) Wahlenbergfjorden ENVELOPE(20.593,20.593,79.721,79.721) Aldousbreen ENVELOPE(20.817,20.817,79.815,79.815) Polar Research 17 1 71 80 |
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Open Polar |
collection |
Polar Research (E-Journal) |
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ftjpolarres |
language |
English |
description |
There are three areas in eastern Svalbard where Vendian tillites are exposed: eastern Ny Friesland, western Nordaustlandet (north and south of Murchisonfjorden) and further east in inner Wahlenbergfjorden, near Aldousbreen. Clasts within the massive unmetamorphosed clay-mica-carbonate matrix of the tillites include carbonates, sandstones, siltstones, metavolcanics, schists and different granitoids, the metamorphic and igneous rock types being more frequent in the upper levels of the formation. Large granite boulders, up to 1 m in diameter, are known from the easternmost outcrop at Aldousbreen. Three granitoid boulders from the Aldousbreen outcrop, differing in petrography and chemistry. have been dated by the Pb-Pb singlezircon method. They yield ages of 2830 ± 5 Ma, 1802 ± 4 Ma and 1497 ± 26 Ma. These clasts also differ in petrography, chemistry and age from all known granitic rocks on Nordaustlandet, which have recently yielded Grenvillian (950-960 Ma) and Caledonian (ca. 410 Ma) ages. The concentration of large granitic clasts in the easternmost known tillite outcrops suggests derivation from the east and/or south. Possible areas include those beneath the ice of Austfonna and below the Carboniferous strata of southeastem Nordaustlandet. The apparent lack of a significant Grenvillian overprint suggests the possibility of a more distant source. |
format |
Article in Journal/Newspaper |
author |
Larionov, Alexander N. Tebenkov, Alexander M. Gee, David G. |
spellingShingle |
Larionov, Alexander N. Tebenkov, Alexander M. Gee, David G. Pb-Pb single-zircon single grain ages of granitoid boulders from the Vendian tillite of Wahlenbergfjorden, Nordaustlandet, Svalbard |
author_facet |
Larionov, Alexander N. Tebenkov, Alexander M. Gee, David G. |
author_sort |
Larionov, Alexander N. |
title |
Pb-Pb single-zircon single grain ages of granitoid boulders from the Vendian tillite of Wahlenbergfjorden, Nordaustlandet, Svalbard |
title_short |
Pb-Pb single-zircon single grain ages of granitoid boulders from the Vendian tillite of Wahlenbergfjorden, Nordaustlandet, Svalbard |
title_full |
Pb-Pb single-zircon single grain ages of granitoid boulders from the Vendian tillite of Wahlenbergfjorden, Nordaustlandet, Svalbard |
title_fullStr |
Pb-Pb single-zircon single grain ages of granitoid boulders from the Vendian tillite of Wahlenbergfjorden, Nordaustlandet, Svalbard |
title_full_unstemmed |
Pb-Pb single-zircon single grain ages of granitoid boulders from the Vendian tillite of Wahlenbergfjorden, Nordaustlandet, Svalbard |
title_sort |
pb-pb single-zircon single grain ages of granitoid boulders from the vendian tillite of wahlenbergfjorden, nordaustlandet, svalbard |
publisher |
Norwegian Polar Institute |
publishDate |
1998 |
url |
https://polarresearch.net/index.php/polar/article/view/2264 https://doi.org/10.3402/polar.v17i1.6608 |
long_lat |
ENVELOPE(22.400,22.400,79.800,79.800) ENVELOPE(24.559,24.559,79.835,79.835) ENVELOPE(16.847,16.847,79.498,79.498) ENVELOPE(18.429,18.429,79.986,79.986) ENVELOPE(20.593,20.593,79.721,79.721) ENVELOPE(20.817,20.817,79.815,79.815) |
geographic |
Svalbard Nordaustlandet Austfonna Ny Friesland Murchisonfjorden Wahlenbergfjorden Aldousbreen |
geographic_facet |
Svalbard Nordaustlandet Austfonna Ny Friesland Murchisonfjorden Wahlenbergfjorden Aldousbreen |
genre |
Austfonna Nordaustlandet Ny Friesland Polar Research Svalbard |
genre_facet |
Austfonna Nordaustlandet Ny Friesland Polar Research Svalbard |
op_source |
Polar Research; Vol. 17 No. 1 (1998); 71-80 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2264/5515 https://polarresearch.net/index.php/polar/article/view/2264 doi:10.3402/polar.v17i1.6608 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v17i1.6608 |
container_title |
Polar Research |
container_volume |
17 |
container_issue |
1 |
container_start_page |
71 |
op_container_end_page |
80 |
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1766364516754391040 |