The Orustdalen Formation of Brøggerhalvøya, Svalbard: A fan delta complex of Dinantian/Namurian age
The Orustdalen Formation of Brøggerhalvaya is well exposed on two coastal sections and is 200–250 m thick. It consists dominantly of siliceous conglomerates and sandstones with subordinate shales and impure coal. One horizon low in the sequence yielded spores of uppermost Dinantian/lowermost Namuria...
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Norwegian Polar Institute
1982
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ftjpolarres:oai:journals.openacademia.net:article/2571 2023-05-15T18:02:40+02:00 The Orustdalen Formation of Brøggerhalvøya, Svalbard: A fan delta complex of Dinantian/Namurian age Fairchild, Ian J. 1982-01-07 application/pdf https://polarresearch.net/index.php/polar/article/view/2571 https://doi.org/10.3402/polar.v1982i1.6997 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2571/5822 https://polarresearch.net/index.php/polar/article/view/2571 doi:10.3402/polar.v1982i1.6997 Copyright (c) 2018 Polar Research Polar Research; Vol. 1982 No. 1 (1982); 17-34 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1982 ftjpolarres https://doi.org/10.3402/polar.v1982i1.6997 2021-11-11T19:12:57Z The Orustdalen Formation of Brøggerhalvaya is well exposed on two coastal sections and is 200–250 m thick. It consists dominantly of siliceous conglomerates and sandstones with subordinate shales and impure coal. One horizon low in the sequence yielded spores of uppermost Dinantian/lowermost Namurian age. Three sedimentary fades have been recognised. The fluvial channel facies (interbedded conglomerates and cross-stratified sandstones) are interpreted as braided stream deposits with flow directions to south and west. A shale facies, sometimes with drifted plant remains, is interpreted as overbank in origin. Highly quartzose, medium-to-coarse-grained, cross-stratified sandstones make up the reworked facies where palaeocurrents are bimodal or indicate movement to the NE. The Formation is thought to represent sediments shed from an early Carboniferous fault scarp eroding’a siliceous Lower Palaeozoic source terrain. The proximity of a nearby coastline led to the construction of fan deltas where fluvial deposits were reworked by waves and/or tides. Early diagenetic events include the local development of pyrite, kaolinite and calcite cements. Reddening’probably occurred during Middle Carboniferous times beneath an exposed land surface. Following burial, pressure solution and quartz cementation eliminated porosity at depths greater than 1000 m. Article in Journal/Newspaper Polar Research Svalbard Polar Research (E-Journal) Svalbard Brøggerhalvøya ENVELOPE(11.736,11.736,78.915,78.915) Orustdalen ENVELOPE(13.992,13.992,77.931,77.931) Polar Research 1982 1 17 34 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
The Orustdalen Formation of Brøggerhalvaya is well exposed on two coastal sections and is 200–250 m thick. It consists dominantly of siliceous conglomerates and sandstones with subordinate shales and impure coal. One horizon low in the sequence yielded spores of uppermost Dinantian/lowermost Namurian age. Three sedimentary fades have been recognised. The fluvial channel facies (interbedded conglomerates and cross-stratified sandstones) are interpreted as braided stream deposits with flow directions to south and west. A shale facies, sometimes with drifted plant remains, is interpreted as overbank in origin. Highly quartzose, medium-to-coarse-grained, cross-stratified sandstones make up the reworked facies where palaeocurrents are bimodal or indicate movement to the NE. The Formation is thought to represent sediments shed from an early Carboniferous fault scarp eroding’a siliceous Lower Palaeozoic source terrain. The proximity of a nearby coastline led to the construction of fan deltas where fluvial deposits were reworked by waves and/or tides. Early diagenetic events include the local development of pyrite, kaolinite and calcite cements. Reddening’probably occurred during Middle Carboniferous times beneath an exposed land surface. Following burial, pressure solution and quartz cementation eliminated porosity at depths greater than 1000 m. |
format |
Article in Journal/Newspaper |
author |
Fairchild, Ian J. |
spellingShingle |
Fairchild, Ian J. The Orustdalen Formation of Brøggerhalvøya, Svalbard: A fan delta complex of Dinantian/Namurian age |
author_facet |
Fairchild, Ian J. |
author_sort |
Fairchild, Ian J. |
title |
The Orustdalen Formation of Brøggerhalvøya, Svalbard: A fan delta complex of Dinantian/Namurian age |
title_short |
The Orustdalen Formation of Brøggerhalvøya, Svalbard: A fan delta complex of Dinantian/Namurian age |
title_full |
The Orustdalen Formation of Brøggerhalvøya, Svalbard: A fan delta complex of Dinantian/Namurian age |
title_fullStr |
The Orustdalen Formation of Brøggerhalvøya, Svalbard: A fan delta complex of Dinantian/Namurian age |
title_full_unstemmed |
The Orustdalen Formation of Brøggerhalvøya, Svalbard: A fan delta complex of Dinantian/Namurian age |
title_sort |
orustdalen formation of brøggerhalvøya, svalbard: a fan delta complex of dinantian/namurian age |
publisher |
Norwegian Polar Institute |
publishDate |
1982 |
url |
https://polarresearch.net/index.php/polar/article/view/2571 https://doi.org/10.3402/polar.v1982i1.6997 |
long_lat |
ENVELOPE(11.736,11.736,78.915,78.915) ENVELOPE(13.992,13.992,77.931,77.931) |
geographic |
Svalbard Brøggerhalvøya Orustdalen |
geographic_facet |
Svalbard Brøggerhalvøya Orustdalen |
genre |
Polar Research Svalbard |
genre_facet |
Polar Research Svalbard |
op_source |
Polar Research; Vol. 1982 No. 1 (1982); 17-34 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2571/5822 https://polarresearch.net/index.php/polar/article/view/2571 doi:10.3402/polar.v1982i1.6997 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v1982i1.6997 |
container_title |
Polar Research |
container_volume |
1982 |
container_issue |
1 |
container_start_page |
17 |
op_container_end_page |
34 |
_version_ |
1766173109472198656 |