Seismic‐stratigraphic constraints on the age of the Faroe Islands Basalt Group, Faroe–Shetland region, Northeast Atlantic Ocean
Abstract Lower Palaeogene extrusive igneous rocks of the Faroe Islands Basalt Group (FIBG) dominate the Faroese continental margin, with flood basalts created at the time of breakup and separation from East Greenland extending eastwards into the Faroe‐Shetland Basin. This volcanic succession was emp...
Published in: | Basin Research |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2019
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/bre.12348 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbre.12348 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12348 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bre.12348 |
id |
crwiley:10.1111/bre.12348 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/bre.12348 2024-09-15T18:04:22+00:00 Seismic‐stratigraphic constraints on the age of the Faroe Islands Basalt Group, Faroe–Shetland region, Northeast Atlantic Ocean Ólavsdóttir, Jana Stoker, Martyn S. Boldreel, Lars O. Andersen, Morten Sparre Eidesgaard, Óluva R. 2019 http://dx.doi.org/10.1111/bre.12348 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbre.12348 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12348 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bre.12348 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Basin Research volume 31, issue 5, page 841-865 ISSN 0950-091X 1365-2117 journal-article 2019 crwiley https://doi.org/10.1111/bre.12348 2024-07-25T04:23:57Z Abstract Lower Palaeogene extrusive igneous rocks of the Faroe Islands Basalt Group (FIBG) dominate the Faroese continental margin, with flood basalts created at the time of breakup and separation from East Greenland extending eastwards into the Faroe‐Shetland Basin. This volcanic succession was emplaced in connection with the opening of the NE Atlantic; however, consensus on the age and duration of volcanism remains lacking. On the Faroe Islands, the FIBG comprises four main basaltic formations (the pre‐breakup Lopra and Beinisvørð formations, and the syn‐breakup Malinstindur and Enni formations) locally separated by thin intrabasaltic sedimentary and/or volcaniclastic units. Offshore, the distribution of these formations remains ambiguous. We examine the stratigraphic framework of these rocks on the Faroese continental margin combining onshore (published) outcrop information with offshore seismic‐reflection and well data. Our results indicate that on seismic‐reflection profiles, the FIBG can be informally divided into lower and upper seismic‐stratigraphic packages separated by the strongly reflective A‐horizon. The Lower FIBG comprises the Lopra and Beinisvørð formations; the upper FIBG includes the Malinstindur and Enni formations. The strongly reflecting A‐horizon is a consequence of the contrast in properties of the overlying Malinstindur and underlying Beinisvørð formations. Onshore, the A‐horizon is an erosional surface, locally cutting down into the Beinisvørð Formation; offshore, we have correlated the A‐horizon with the Flett unconformity, a highly incised, subaerial unconformity, within the juxtaposed and interbedded sedimentary fill of the Faroe‐Shetland Basin. We refer to this key regional boundary as the A‐horizon/Flett unconformity. The formation of this unconformity represents the transition from the pre‐breakup to the syn‐breakup phase of ocean margin development in the Faroe–Shetland region. We examine the wider implications of this correlation considering existing stratigraphic models for the ... Article in Journal/Newspaper East Greenland Faroe Islands Greenland Northeast Atlantic Wiley Online Library Basin Research 31 5 841 865 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Lower Palaeogene extrusive igneous rocks of the Faroe Islands Basalt Group (FIBG) dominate the Faroese continental margin, with flood basalts created at the time of breakup and separation from East Greenland extending eastwards into the Faroe‐Shetland Basin. This volcanic succession was emplaced in connection with the opening of the NE Atlantic; however, consensus on the age and duration of volcanism remains lacking. On the Faroe Islands, the FIBG comprises four main basaltic formations (the pre‐breakup Lopra and Beinisvørð formations, and the syn‐breakup Malinstindur and Enni formations) locally separated by thin intrabasaltic sedimentary and/or volcaniclastic units. Offshore, the distribution of these formations remains ambiguous. We examine the stratigraphic framework of these rocks on the Faroese continental margin combining onshore (published) outcrop information with offshore seismic‐reflection and well data. Our results indicate that on seismic‐reflection profiles, the FIBG can be informally divided into lower and upper seismic‐stratigraphic packages separated by the strongly reflective A‐horizon. The Lower FIBG comprises the Lopra and Beinisvørð formations; the upper FIBG includes the Malinstindur and Enni formations. The strongly reflecting A‐horizon is a consequence of the contrast in properties of the overlying Malinstindur and underlying Beinisvørð formations. Onshore, the A‐horizon is an erosional surface, locally cutting down into the Beinisvørð Formation; offshore, we have correlated the A‐horizon with the Flett unconformity, a highly incised, subaerial unconformity, within the juxtaposed and interbedded sedimentary fill of the Faroe‐Shetland Basin. We refer to this key regional boundary as the A‐horizon/Flett unconformity. The formation of this unconformity represents the transition from the pre‐breakup to the syn‐breakup phase of ocean margin development in the Faroe–Shetland region. We examine the wider implications of this correlation considering existing stratigraphic models for the ... |
format |
Article in Journal/Newspaper |
author |
Ólavsdóttir, Jana Stoker, Martyn S. Boldreel, Lars O. Andersen, Morten Sparre Eidesgaard, Óluva R. |
spellingShingle |
Ólavsdóttir, Jana Stoker, Martyn S. Boldreel, Lars O. Andersen, Morten Sparre Eidesgaard, Óluva R. Seismic‐stratigraphic constraints on the age of the Faroe Islands Basalt Group, Faroe–Shetland region, Northeast Atlantic Ocean |
author_facet |
Ólavsdóttir, Jana Stoker, Martyn S. Boldreel, Lars O. Andersen, Morten Sparre Eidesgaard, Óluva R. |
author_sort |
Ólavsdóttir, Jana |
title |
Seismic‐stratigraphic constraints on the age of the Faroe Islands Basalt Group, Faroe–Shetland region, Northeast Atlantic Ocean |
title_short |
Seismic‐stratigraphic constraints on the age of the Faroe Islands Basalt Group, Faroe–Shetland region, Northeast Atlantic Ocean |
title_full |
Seismic‐stratigraphic constraints on the age of the Faroe Islands Basalt Group, Faroe–Shetland region, Northeast Atlantic Ocean |
title_fullStr |
Seismic‐stratigraphic constraints on the age of the Faroe Islands Basalt Group, Faroe–Shetland region, Northeast Atlantic Ocean |
title_full_unstemmed |
Seismic‐stratigraphic constraints on the age of the Faroe Islands Basalt Group, Faroe–Shetland region, Northeast Atlantic Ocean |
title_sort |
seismic‐stratigraphic constraints on the age of the faroe islands basalt group, faroe–shetland region, northeast atlantic ocean |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1111/bre.12348 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbre.12348 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12348 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bre.12348 |
genre |
East Greenland Faroe Islands Greenland Northeast Atlantic |
genre_facet |
East Greenland Faroe Islands Greenland Northeast Atlantic |
op_source |
Basin Research volume 31, issue 5, page 841-865 ISSN 0950-091X 1365-2117 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bre.12348 |
container_title |
Basin Research |
container_volume |
31 |
container_issue |
5 |
container_start_page |
841 |
op_container_end_page |
865 |
_version_ |
1810441862640566272 |