Petrology of differential gabbro sheets in the Altenes tectonic window, North Norway.
The petrography of two differentiated gabbro sheets in the low-grademetamorphic Karelian supracrustal sequence of the Altenes Tectonic Window isdescribed. The intrusion have generally undergone extensive deuteric alter-ation. Detailed petrographic studies established the primary parageneses andvaria...
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1989
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ftnorgesgu:oai:openarchive.ngu.no:11250/2674201 2023-05-15T17:01:32+02:00 Petrology of differential gabbro sheets in the Altenes tectonic window, North Norway. Pratt, Allan Oliver 18341 Alta 1989 application/pdf https://hdl.handle.net/11250/2674201 eng eng NGU Bulletin (414) https://hdl.handle.net/11250/2674201 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 21-35 GABBRO KALEDONSKE FJELLKJEDE PETROLOGI Journal article 1989 ftnorgesgu 2022-07-03T15:26:10Z The petrography of two differentiated gabbro sheets in the low-grademetamorphic Karelian supracrustal sequence of the Altenes Tectonic Window isdescribed. The intrusion have generally undergone extensive deuteric alter-ation. Detailed petrographic studies established the primary parageneses andvariation in the gabbro sheets and formed the basis for an interpretation ofthe geochemical profiles. Both intrusion have a distinct mineralogical andchemical variation suggesting that gabbro sheets in the window probablycomprise both sills and slightly inclined intrusions. Magmatic rocks in theAltenes Window describe a definite tholeiitic trend. Zr-FeO\/MgO and Zr-Y plotsof the two studied intrusions suggest the existence of two magmatic suites.The Trollvatn sill is interpreted as syngenetic with the mafic extrusive rockswhile the Sagelv intrusion probably intruded at a low angle in an early stageof the Svecokarelian orogeny. 35176 Article in Journal/Newspaper karelian North Norway NGU Open Archive (Geological Survey of Norway) Alta Norway Altenes ENVELOPE(23.134,23.134,70.086,70.086) |
institution |
Open Polar |
collection |
NGU Open Archive (Geological Survey of Norway) |
op_collection_id |
ftnorgesgu |
language |
English |
topic |
GABBRO KALEDONSKE FJELLKJEDE PETROLOGI |
spellingShingle |
GABBRO KALEDONSKE FJELLKJEDE PETROLOGI Pratt, Allan Oliver Petrology of differential gabbro sheets in the Altenes tectonic window, North Norway. |
topic_facet |
GABBRO KALEDONSKE FJELLKJEDE PETROLOGI |
description |
The petrography of two differentiated gabbro sheets in the low-grademetamorphic Karelian supracrustal sequence of the Altenes Tectonic Window isdescribed. The intrusion have generally undergone extensive deuteric alter-ation. Detailed petrographic studies established the primary parageneses andvariation in the gabbro sheets and formed the basis for an interpretation ofthe geochemical profiles. Both intrusion have a distinct mineralogical andchemical variation suggesting that gabbro sheets in the window probablycomprise both sills and slightly inclined intrusions. Magmatic rocks in theAltenes Window describe a definite tholeiitic trend. Zr-FeO\/MgO and Zr-Y plotsof the two studied intrusions suggest the existence of two magmatic suites.The Trollvatn sill is interpreted as syngenetic with the mafic extrusive rockswhile the Sagelv intrusion probably intruded at a low angle in an early stageof the Svecokarelian orogeny. 35176 |
format |
Article in Journal/Newspaper |
author |
Pratt, Allan Oliver |
author_facet |
Pratt, Allan Oliver |
author_sort |
Pratt, Allan Oliver |
title |
Petrology of differential gabbro sheets in the Altenes tectonic window, North Norway. |
title_short |
Petrology of differential gabbro sheets in the Altenes tectonic window, North Norway. |
title_full |
Petrology of differential gabbro sheets in the Altenes tectonic window, North Norway. |
title_fullStr |
Petrology of differential gabbro sheets in the Altenes tectonic window, North Norway. |
title_full_unstemmed |
Petrology of differential gabbro sheets in the Altenes tectonic window, North Norway. |
title_sort |
petrology of differential gabbro sheets in the altenes tectonic window, north norway. |
publishDate |
1989 |
url |
https://hdl.handle.net/11250/2674201 |
op_coverage |
18341 Alta |
long_lat |
ENVELOPE(23.134,23.134,70.086,70.086) |
geographic |
Alta Norway Altenes |
geographic_facet |
Alta Norway Altenes |
genre |
karelian North Norway |
genre_facet |
karelian North Norway |
op_source |
21-35 |
op_relation |
NGU Bulletin (414) https://hdl.handle.net/11250/2674201 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
_version_ |
1766054638349451264 |