Metamorphic and structural diachroneity in the Finnmarkian nappes of north Norway
Abstract Two periods of garnet growth (Gt 1 and Gt 2 ) have been found in the Finnmarkian nappes of north Norway. In the Kolvik Nappe (the lowest nappe) Gt 1 has preserved an S 2 syntectonic spiral inclusion fabric; in the Olderfjord Nappe an earlier S 1 fabric and an interkinematic inter‐D 1 –D 2 f...
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crwiley:10.1111/j.1525-1314.1984.tb00297.x 2024-06-23T07:55:24+00:00 Metamorphic and structural diachroneity in the Finnmarkian nappes of north Norway RICE, A. H. N. 1984 http://dx.doi.org/10.1111/j.1525-1314.1984.tb00297.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1525-1314.1984.tb00297.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1525-1314.1984.tb00297.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Metamorphic Geology volume 2, issue 3, page 219-236 ISSN 0263-4929 1525-1314 journal-article 1984 crwiley https://doi.org/10.1111/j.1525-1314.1984.tb00297.x 2024-06-06T04:19:37Z Abstract Two periods of garnet growth (Gt 1 and Gt 2 ) have been found in the Finnmarkian nappes of north Norway. In the Kolvik Nappe (the lowest nappe) Gt 1 has preserved an S 2 syntectonic spiral inclusion fabric; in the Olderfjord Nappe an earlier S 1 fabric and an interkinematic inter‐D 1 –D 2 fabric have been preserved in Gt 1 whilst only the S 1 fabric has been found in Gt 1 in the Brennsvik Nappe (the highest nappe). In each nappe Gt 2 overgrew a penetrative fabric (S 2 ) wrapped around Gt 1 . In the Kolvik Nappe inclusion fabrics may be continuous from Gt 1 into Gt 2 but in the higher nappes there is a distinct break. Gt 2 may have been partially syntectonic with D 3 in the Brennsvik Nappe. Chemically Gt 1 in the Kolvik Nappe and in parts of the Olderfjord and Brennsvik Nappes has antithetic Fe‐Mn zoning. In all nappes X Ca and X Mg are weakly zoned in Gt 1 X Mg increases outwards and is greater in the higher nappes in Gt 1 suggesting higher nucleation temperatures. In the Olderfjord and Brennsvik Nappes Gt 2 is marked by increasing X Ca , probably due to changing garnet‐plagioclase equilibria, although the Fe/Mg ratio remains constant. X Mg is higher in Gt 2 than Gt 1 . Basement rocks within the nappe pile have an early pre‐Finnmarkian growth (Gt 1 ) and a later Finnmarkian growth (Gt H ) correlated with Gt 2 on the basis of chemical zoning patterns. The diachroneity of Gt 1 is ascribed to progressively earlier (compared to the structural development) cessation of overstepping of garnet‐forming reactions before peak metamorphism in the higher nappes, resulting in earlier structural events being preserved. Article in Journal/Newspaper North Norway Wiley Online Library Brennsvik ENVELOPE(24.142,24.142,70.567,70.567) Norway Olderfjord ENVELOPE(21.482,21.482,70.175,70.175) Journal of Metamorphic Geology 2 3 219 236 |
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Wiley Online Library |
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English |
description |
Abstract Two periods of garnet growth (Gt 1 and Gt 2 ) have been found in the Finnmarkian nappes of north Norway. In the Kolvik Nappe (the lowest nappe) Gt 1 has preserved an S 2 syntectonic spiral inclusion fabric; in the Olderfjord Nappe an earlier S 1 fabric and an interkinematic inter‐D 1 –D 2 fabric have been preserved in Gt 1 whilst only the S 1 fabric has been found in Gt 1 in the Brennsvik Nappe (the highest nappe). In each nappe Gt 2 overgrew a penetrative fabric (S 2 ) wrapped around Gt 1 . In the Kolvik Nappe inclusion fabrics may be continuous from Gt 1 into Gt 2 but in the higher nappes there is a distinct break. Gt 2 may have been partially syntectonic with D 3 in the Brennsvik Nappe. Chemically Gt 1 in the Kolvik Nappe and in parts of the Olderfjord and Brennsvik Nappes has antithetic Fe‐Mn zoning. In all nappes X Ca and X Mg are weakly zoned in Gt 1 X Mg increases outwards and is greater in the higher nappes in Gt 1 suggesting higher nucleation temperatures. In the Olderfjord and Brennsvik Nappes Gt 2 is marked by increasing X Ca , probably due to changing garnet‐plagioclase equilibria, although the Fe/Mg ratio remains constant. X Mg is higher in Gt 2 than Gt 1 . Basement rocks within the nappe pile have an early pre‐Finnmarkian growth (Gt 1 ) and a later Finnmarkian growth (Gt H ) correlated with Gt 2 on the basis of chemical zoning patterns. The diachroneity of Gt 1 is ascribed to progressively earlier (compared to the structural development) cessation of overstepping of garnet‐forming reactions before peak metamorphism in the higher nappes, resulting in earlier structural events being preserved. |
format |
Article in Journal/Newspaper |
author |
RICE, A. H. N. |
spellingShingle |
RICE, A. H. N. Metamorphic and structural diachroneity in the Finnmarkian nappes of north Norway |
author_facet |
RICE, A. H. N. |
author_sort |
RICE, A. H. N. |
title |
Metamorphic and structural diachroneity in the Finnmarkian nappes of north Norway |
title_short |
Metamorphic and structural diachroneity in the Finnmarkian nappes of north Norway |
title_full |
Metamorphic and structural diachroneity in the Finnmarkian nappes of north Norway |
title_fullStr |
Metamorphic and structural diachroneity in the Finnmarkian nappes of north Norway |
title_full_unstemmed |
Metamorphic and structural diachroneity in the Finnmarkian nappes of north Norway |
title_sort |
metamorphic and structural diachroneity in the finnmarkian nappes of north norway |
publisher |
Wiley |
publishDate |
1984 |
url |
http://dx.doi.org/10.1111/j.1525-1314.1984.tb00297.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1525-1314.1984.tb00297.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1525-1314.1984.tb00297.x |
long_lat |
ENVELOPE(24.142,24.142,70.567,70.567) ENVELOPE(21.482,21.482,70.175,70.175) |
geographic |
Brennsvik Norway Olderfjord |
geographic_facet |
Brennsvik Norway Olderfjord |
genre |
North Norway |
genre_facet |
North Norway |
op_source |
Journal of Metamorphic Geology volume 2, issue 3, page 219-236 ISSN 0263-4929 1525-1314 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1525-1314.1984.tb00297.x |
container_title |
Journal of Metamorphic Geology |
container_volume |
2 |
container_issue |
3 |
container_start_page |
219 |
op_container_end_page |
236 |
_version_ |
1802647986668306432 |