Geological investigations in the Bamble sector of the Fennoscandian Shield South Norway. I. The geology of eastern Bamble.
This paper, based upon a recent survey on a scale of 1:15 000, constitutes a description of the geology and broad structural aspects of the E. Bamble regiom, S. Norway. Two principle groups of Precambrian metamorphics and intrusives are recognized, namely: (1) those exhibiting only localized, minor...
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ftnorgesgu:oai:openarchive.ngu.no:11250/2674911 2023-05-15T16:13:01+02:00 Geological investigations in the Bamble sector of the Fennoscandian Shield South Norway. I. The geology of eastern Bamble. O'Nions, R.K. Morton, R.D. Batey, R. 17124 Kragerø 17132 Porsgrunn 17133 Kilebygd 17121 Langesund 1970 application/pdf https://hdl.handle.net/11250/2674911 eng eng NGU (263) https://hdl.handle.net/11250/2674911 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 1-72 + ka GEOFYSIKK STRUKTURGEOLOGI PETROGRAFI MALMGEOLOGI MINERALOGI KARTLEGGING Journal article 1970 ftnorgesgu 2022-07-03T15:26:51Z This paper, based upon a recent survey on a scale of 1:15 000, constitutes a description of the geology and broad structural aspects of the E. Bamble regiom, S. Norway. Two principle groups of Precambrian metamorphics and intrusives are recognized, namely: (1) those exhibiting only localized, minor cataclasis and (2) characterized by cataclasis. The latter group occupies a 4-5 km wide zone in the north of the region. All of these rocks have undergone regional metamorphism under the P-T conditions of the almandine-amphibolite facies. Assemblages diagnostic of both the sillimanite-almandine-orthoclase subfacies and the sillimanite-almandine-muscovite subfacies of the almandine-amphibolite facies are common. Occasionally assemblages suggestive of the hornblende-granulite- or the pyroxene-granulite-subfacies of the granulite facies were noted. Retrograde metamorphism or distinct, lowergrade thermal regimes are indicated by the presence of epidote, chlorite and prehnite. A group of metasediments, representing pre-existing sandstones, arkoses and argillaceous rocks, has been partially mobilized and affected by injection of syntectonic granitic and gabbroic rocks. Granitic, granodioritic and quartz-dioritic gneisses are common throughout the region and are thought to have been derived by anatexis within a meta-sedimentary-metavolcanic sequence. 34871 Article in Journal/Newspaper Fennoscandian NGU Open Archive (Geological Survey of Norway) Norway |
institution |
Open Polar |
collection |
NGU Open Archive (Geological Survey of Norway) |
op_collection_id |
ftnorgesgu |
language |
English |
topic |
GEOFYSIKK STRUKTURGEOLOGI PETROGRAFI MALMGEOLOGI MINERALOGI KARTLEGGING |
spellingShingle |
GEOFYSIKK STRUKTURGEOLOGI PETROGRAFI MALMGEOLOGI MINERALOGI KARTLEGGING O'Nions, R.K. Morton, R.D. Batey, R. Geological investigations in the Bamble sector of the Fennoscandian Shield South Norway. I. The geology of eastern Bamble. |
topic_facet |
GEOFYSIKK STRUKTURGEOLOGI PETROGRAFI MALMGEOLOGI MINERALOGI KARTLEGGING |
description |
This paper, based upon a recent survey on a scale of 1:15 000, constitutes a description of the geology and broad structural aspects of the E. Bamble regiom, S. Norway. Two principle groups of Precambrian metamorphics and intrusives are recognized, namely: (1) those exhibiting only localized, minor cataclasis and (2) characterized by cataclasis. The latter group occupies a 4-5 km wide zone in the north of the region. All of these rocks have undergone regional metamorphism under the P-T conditions of the almandine-amphibolite facies. Assemblages diagnostic of both the sillimanite-almandine-orthoclase subfacies and the sillimanite-almandine-muscovite subfacies of the almandine-amphibolite facies are common. Occasionally assemblages suggestive of the hornblende-granulite- or the pyroxene-granulite-subfacies of the granulite facies were noted. Retrograde metamorphism or distinct, lowergrade thermal regimes are indicated by the presence of epidote, chlorite and prehnite. A group of metasediments, representing pre-existing sandstones, arkoses and argillaceous rocks, has been partially mobilized and affected by injection of syntectonic granitic and gabbroic rocks. Granitic, granodioritic and quartz-dioritic gneisses are common throughout the region and are thought to have been derived by anatexis within a meta-sedimentary-metavolcanic sequence. 34871 |
format |
Article in Journal/Newspaper |
author |
O'Nions, R.K. Morton, R.D. Batey, R. |
author_facet |
O'Nions, R.K. Morton, R.D. Batey, R. |
author_sort |
O'Nions, R.K. |
title |
Geological investigations in the Bamble sector of the Fennoscandian Shield South Norway. I. The geology of eastern Bamble. |
title_short |
Geological investigations in the Bamble sector of the Fennoscandian Shield South Norway. I. The geology of eastern Bamble. |
title_full |
Geological investigations in the Bamble sector of the Fennoscandian Shield South Norway. I. The geology of eastern Bamble. |
title_fullStr |
Geological investigations in the Bamble sector of the Fennoscandian Shield South Norway. I. The geology of eastern Bamble. |
title_full_unstemmed |
Geological investigations in the Bamble sector of the Fennoscandian Shield South Norway. I. The geology of eastern Bamble. |
title_sort |
geological investigations in the bamble sector of the fennoscandian shield south norway. i. the geology of eastern bamble. |
publishDate |
1970 |
url |
https://hdl.handle.net/11250/2674911 |
op_coverage |
17124 Kragerø 17132 Porsgrunn 17133 Kilebygd 17121 Langesund |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
1-72 + ka |
op_relation |
NGU (263) https://hdl.handle.net/11250/2674911 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
_version_ |
1765998621339156480 |