Geology and structure of the Bjøllånes area, Rana, Nordland.
The field relationships of rock groups of three tectonic units from the area west of the Lønsdalen basal massif are outlined and the lithologies and mineral assemblages are described. Chemical analyses of marbles and amphibolites are presented and discussed in relation to analytical data from neighb...
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1978
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ftnorgesgu:oai:openarchive.ngu.no:11250/2675073 2023-05-15T17:24:39+02:00 Geology and structure of the Bjøllånes area, Rana, Nordland. Gjelle, Svein 20282 Bjøllådal 20271 Dunderlandsdal 1978 application/pdf https://hdl.handle.net/11250/2675073 eng eng NGU (343) https://hdl.handle.net/11250/2675073 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 1-37 + ka PETROGRAFI OMDANNING STRATIGRAFI KALEDONSKE FJELLKJEDE TEKTONIKK KARTLEGGING Journal article 1978 ftnorgesgu 2022-07-03T15:26:34Z The field relationships of rock groups of three tectonic units from the area west of the Lønsdalen basal massif are outlined and the lithologies and mineral assemblages are described. Chemical analyses of marbles and amphibolites are presented and discussed in relation to analytical data from neighbouring areas of the Caledonides. Most of the amphibolites are shown to be of igneous origin and sub-alkaline, but their precise nature is uncertain. The structure recorded suggest four phases of Caledonian deformation. The F1 phase probably had axes orientated roughly E-W which is also the axial trend of the F2 phase. The first deformation produced minor isoclinal folds, the main foliation and one possible thrust zone. The second phase gave rise to relatively tight mesoscopic and macroscopic folds. The F3 phase, approximately N-S oriented, deforms the earlier structures and is responsible for the main lithological outcrop pattern. The thrusting of the middle and the upper unit is thought to be connected with this deformation phase. Possible correlations of the Bjøllåsen rocks with those from neighbouring aeras of the Caledonides in Norway and Sweden are proposed. There would seem to be good evidence that the R\u00F6dingsfj\u00E4ll Nappe is situated at a tectonically higher level than the Gasak Nappe which previously was suppossed to be in an identical tectonic position. 36052 Article in Journal/Newspaper Nordland Nordland Rana Nordland NGU Open Archive (Geological Survey of Norway) Bjøllånes ENVELOPE(14.904,14.904,66.507,66.507) Bjøllåsen ENVELOPE(13.334,13.334,66.049,66.049) Lønsdalen ENVELOPE(15.435,15.435,66.711,66.711) Norway |
institution |
Open Polar |
collection |
NGU Open Archive (Geological Survey of Norway) |
op_collection_id |
ftnorgesgu |
language |
English |
topic |
PETROGRAFI OMDANNING STRATIGRAFI KALEDONSKE FJELLKJEDE TEKTONIKK KARTLEGGING |
spellingShingle |
PETROGRAFI OMDANNING STRATIGRAFI KALEDONSKE FJELLKJEDE TEKTONIKK KARTLEGGING Gjelle, Svein Geology and structure of the Bjøllånes area, Rana, Nordland. |
topic_facet |
PETROGRAFI OMDANNING STRATIGRAFI KALEDONSKE FJELLKJEDE TEKTONIKK KARTLEGGING |
description |
The field relationships of rock groups of three tectonic units from the area west of the Lønsdalen basal massif are outlined and the lithologies and mineral assemblages are described. Chemical analyses of marbles and amphibolites are presented and discussed in relation to analytical data from neighbouring areas of the Caledonides. Most of the amphibolites are shown to be of igneous origin and sub-alkaline, but their precise nature is uncertain. The structure recorded suggest four phases of Caledonian deformation. The F1 phase probably had axes orientated roughly E-W which is also the axial trend of the F2 phase. The first deformation produced minor isoclinal folds, the main foliation and one possible thrust zone. The second phase gave rise to relatively tight mesoscopic and macroscopic folds. The F3 phase, approximately N-S oriented, deforms the earlier structures and is responsible for the main lithological outcrop pattern. The thrusting of the middle and the upper unit is thought to be connected with this deformation phase. Possible correlations of the Bjøllåsen rocks with those from neighbouring aeras of the Caledonides in Norway and Sweden are proposed. There would seem to be good evidence that the R\u00F6dingsfj\u00E4ll Nappe is situated at a tectonically higher level than the Gasak Nappe which previously was suppossed to be in an identical tectonic position. 36052 |
format |
Article in Journal/Newspaper |
author |
Gjelle, Svein |
author_facet |
Gjelle, Svein |
author_sort |
Gjelle, Svein |
title |
Geology and structure of the Bjøllånes area, Rana, Nordland. |
title_short |
Geology and structure of the Bjøllånes area, Rana, Nordland. |
title_full |
Geology and structure of the Bjøllånes area, Rana, Nordland. |
title_fullStr |
Geology and structure of the Bjøllånes area, Rana, Nordland. |
title_full_unstemmed |
Geology and structure of the Bjøllånes area, Rana, Nordland. |
title_sort |
geology and structure of the bjøllånes area, rana, nordland. |
publishDate |
1978 |
url |
https://hdl.handle.net/11250/2675073 |
op_coverage |
20282 Bjøllådal 20271 Dunderlandsdal |
long_lat |
ENVELOPE(14.904,14.904,66.507,66.507) ENVELOPE(13.334,13.334,66.049,66.049) ENVELOPE(15.435,15.435,66.711,66.711) |
geographic |
Bjøllånes Bjøllåsen Lønsdalen Norway |
geographic_facet |
Bjøllånes Bjøllåsen Lønsdalen Norway |
genre |
Nordland Nordland Rana Nordland |
genre_facet |
Nordland Nordland Rana Nordland |
op_source |
1-37 + ka |
op_relation |
NGU (343) https://hdl.handle.net/11250/2675073 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
_version_ |
1766115771930378240 |