A likely Early Ordovician age for the regional penetrative cleavage in the Gaissa Nappe Complex.
Pervasively cleaved mudstones and claystones from two different parts of the Gaissa Nappe Complex in Finnmark wre subjected to Rb-Sr whole-rock analytical investigation. Although neither of the two groups of samples yielded a true isochron, the data do support the concept of a probable age at around...
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2003
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Online Access: | https://hdl.handle.net/11250/2674105 |
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ftnorgesgu:oai:openarchive.ngu.no:11250/2674105 2023-05-15T16:13:40+02:00 A likely Early Ordovician age for the regional penetrative cleavage in the Gaissa Nappe Complex. Sundvoll, Bjørn Roberts, David 21353 Ræt'kajákskai'di 20353 Lakselv 19352 Stabbursdalen LEBESBY PORSANGER 21354 Viek'sa 2003 application/pdf https://hdl.handle.net/11250/2674105 eng eng NGU Bulletin (441) https://hdl.handle.net/11250/2674105 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 51-59 ORDOVICIUM STRUKTURGEOLOGI STRATIGRAFI PETROGRAFI Journal article 2003 ftnorgesgu 2022-07-03T15:26:32Z Pervasively cleaved mudstones and claystones from two different parts of the Gaissa Nappe Complex in Finnmark wre subjected to Rb-Sr whole-rock analytical investigation. Although neither of the two groups of samples yielded a true isochron, the data do support the concept of a probable age at around 480-550 Ma, as can be discerned from the \"isochron fits\" of various combinations of the analytical data. Together with the relatively high 87Sr\/86Sr initial ratios, this results strongly suggests that a Sr-isotopic resetting event occurred at around 480-500 Ma, an event which is considered to reflect an overall, pervasive metamorphic imprint on the rock formations of the Gaissa Nappe Complex. Earlier radiometric dating from this same allochthon has yielded ambiguous results, some pointing to Finnmarkian (Late Cambrian-Early Ordovician) (forkortet) 50694 Article in Journal/Newspaper Finnmark Lakselv Lebesby Porsanger Finnmark NGU Open Archive (Geological Survey of Norway) Lebesby ENVELOPE(27.002,27.002,70.573,70.573) Porsanger ENVELOPE(24.956,24.956,70.052,70.052) Stabbursdalen ENVELOPE(9.016,9.016,63.444,63.444) |
institution |
Open Polar |
collection |
NGU Open Archive (Geological Survey of Norway) |
op_collection_id |
ftnorgesgu |
language |
English |
topic |
ORDOVICIUM STRUKTURGEOLOGI STRATIGRAFI PETROGRAFI |
spellingShingle |
ORDOVICIUM STRUKTURGEOLOGI STRATIGRAFI PETROGRAFI Sundvoll, Bjørn Roberts, David A likely Early Ordovician age for the regional penetrative cleavage in the Gaissa Nappe Complex. |
topic_facet |
ORDOVICIUM STRUKTURGEOLOGI STRATIGRAFI PETROGRAFI |
description |
Pervasively cleaved mudstones and claystones from two different parts of the Gaissa Nappe Complex in Finnmark wre subjected to Rb-Sr whole-rock analytical investigation. Although neither of the two groups of samples yielded a true isochron, the data do support the concept of a probable age at around 480-550 Ma, as can be discerned from the \"isochron fits\" of various combinations of the analytical data. Together with the relatively high 87Sr\/86Sr initial ratios, this results strongly suggests that a Sr-isotopic resetting event occurred at around 480-500 Ma, an event which is considered to reflect an overall, pervasive metamorphic imprint on the rock formations of the Gaissa Nappe Complex. Earlier radiometric dating from this same allochthon has yielded ambiguous results, some pointing to Finnmarkian (Late Cambrian-Early Ordovician) (forkortet) 50694 |
format |
Article in Journal/Newspaper |
author |
Sundvoll, Bjørn Roberts, David |
author_facet |
Sundvoll, Bjørn Roberts, David |
author_sort |
Sundvoll, Bjørn |
title |
A likely Early Ordovician age for the regional penetrative cleavage in the Gaissa Nappe Complex. |
title_short |
A likely Early Ordovician age for the regional penetrative cleavage in the Gaissa Nappe Complex. |
title_full |
A likely Early Ordovician age for the regional penetrative cleavage in the Gaissa Nappe Complex. |
title_fullStr |
A likely Early Ordovician age for the regional penetrative cleavage in the Gaissa Nappe Complex. |
title_full_unstemmed |
A likely Early Ordovician age for the regional penetrative cleavage in the Gaissa Nappe Complex. |
title_sort |
likely early ordovician age for the regional penetrative cleavage in the gaissa nappe complex. |
publishDate |
2003 |
url |
https://hdl.handle.net/11250/2674105 |
op_coverage |
21353 Ræt'kajákskai'di 20353 Lakselv 19352 Stabbursdalen LEBESBY PORSANGER 21354 Viek'sa |
long_lat |
ENVELOPE(27.002,27.002,70.573,70.573) ENVELOPE(24.956,24.956,70.052,70.052) ENVELOPE(9.016,9.016,63.444,63.444) |
geographic |
Lebesby Porsanger Stabbursdalen |
geographic_facet |
Lebesby Porsanger Stabbursdalen |
genre |
Finnmark Lakselv Lebesby Porsanger Finnmark |
genre_facet |
Finnmark Lakselv Lebesby Porsanger Finnmark |
op_source |
51-59 |
op_relation |
NGU Bulletin (441) https://hdl.handle.net/11250/2674105 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
_version_ |
1765999469863632896 |