The nature and significance of the Faroe-Shetland Terrane : linking Archaean basement blocks across the North Atlantic.
Core samples of the continental basement rocks that underlie the eastern Faroe-Shetland Basin (FSB) and its inshore margins west of Shetland reveal a suite of predominantly granodioritic to granitic orthogneisses (including TTG), together with lesser volumes of foliated granitoids and subordinate di...
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Elsevier
2019
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Online Access: | http://dro.dur.ac.uk/26917/ http://dro.dur.ac.uk/26917/2/26917.pdf http://dro.dur.ac.uk/26917/1/26917.pdf https://doi.org/10.1016/j.precamres.2018.12.004 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:26917 2023-05-15T16:30:16+02:00 The nature and significance of the Faroe-Shetland Terrane : linking Archaean basement blocks across the North Atlantic. Holdsworth, R.E. Morton, A. Frei, D. Gerdes, A. Strachan, R.A. Dempsey, E. Warren, C. Whitham, A. 2019-02-01 application/pdf http://dro.dur.ac.uk/26917/ http://dro.dur.ac.uk/26917/2/26917.pdf http://dro.dur.ac.uk/26917/1/26917.pdf https://doi.org/10.1016/j.precamres.2018.12.004 unknown Elsevier dro:26917 issn:0301-9268 doi:10.1016/j.precamres.2018.12.004 http://dro.dur.ac.uk/26917/ https://doi.org/10.1016/j.precamres.2018.12.004 http://dro.dur.ac.uk/26917/2/26917.pdf http://dro.dur.ac.uk/26917/1/26917.pdf © 2018 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Precambrian research, 2019, Vol.321, pp.154-171 [Peer Reviewed Journal] Article PeerReviewed 2019 ftunivdurham https://doi.org/10.1016/j.precamres.2018.12.004 2020-06-11T22:24:14Z Core samples of the continental basement rocks that underlie the eastern Faroe-Shetland Basin (FSB) and its inshore margins west of Shetland reveal a suite of predominantly granodioritic to granitic orthogneisses (including TTG), together with lesser volumes of foliated granitoids and subordinate dioritic to mafic gneisses and amphibolites. A small area of lithologically similar gneisses also crops out onshore at North Roe/Uyea west of the Caledonian front in Shetland. In the core samples, coarse grained gneissose textures and mineralogies consistent with upper amphibolite facies metamorphism are overprinted by a weak, but ubiquitous, static greenschist facies retrogression. Later structures include widespread epidote-quartz veining, and local developments of mylonite, cataclasite, pseudotachylite and phyllonite. Regions associated with the Rona Ridge oil fields (e.g. Clair, Lancaster) also preserve extensive brittle fracturing and associated low temperature hydrothermal mineralization (quartz, adularia, calcite, pyrite/chalcopyrite) with significant fracture-hosted hydrocarbons. New and published U-Pb zircon analyses from the gneisses offshore give a relatively narrow range of Neoarchaean protolith ages (ca 2.7-2.8 Ga) spread over a geographic area of 60,000 km2 west of Shetland. Detrital zircon data from overlying Triassic-Cretaceous sedimentary sequences in the FSB suggest an equivalent limited range of Neoarchaean source materials. Hf isotopic data indicate involvement of Palaeo- to Mesoarchaean crustal sources. Overall, our findings suggest that a major phase of Neoarchaean crustal formation and associated high grade metamorphism dominates basement rocks in the region. They are similar in age and lithology to the protoliths of the nearest onshore Lewisian Complex of NW Scotland (Rhiconich Terrane). However, they lack geochronological or textural evidence for the widespread Proterozoic Laxfordian events (ca 1.7-1.8 Ga) which are widespread in Scotland. This suggests that the Precambrian rocks west of Shetland – the Faroe-Shetland Terrane - can be correlated with the Archaean rocks of the Central Greenland-Rae Craton and that a northern limit of Proterozoic reworking lies just offshore from the north coast of Scotland. Article in Journal/Newspaper Greenland North Atlantic Durham University: Durham Research Online Greenland Rae ENVELOPE(-116.053,-116.053,62.834,62.834) Rona ENVELOPE(13.943,13.943,66.985,66.985) Precambrian Research 321 154 171 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
Core samples of the continental basement rocks that underlie the eastern Faroe-Shetland Basin (FSB) and its inshore margins west of Shetland reveal a suite of predominantly granodioritic to granitic orthogneisses (including TTG), together with lesser volumes of foliated granitoids and subordinate dioritic to mafic gneisses and amphibolites. A small area of lithologically similar gneisses also crops out onshore at North Roe/Uyea west of the Caledonian front in Shetland. In the core samples, coarse grained gneissose textures and mineralogies consistent with upper amphibolite facies metamorphism are overprinted by a weak, but ubiquitous, static greenschist facies retrogression. Later structures include widespread epidote-quartz veining, and local developments of mylonite, cataclasite, pseudotachylite and phyllonite. Regions associated with the Rona Ridge oil fields (e.g. Clair, Lancaster) also preserve extensive brittle fracturing and associated low temperature hydrothermal mineralization (quartz, adularia, calcite, pyrite/chalcopyrite) with significant fracture-hosted hydrocarbons. New and published U-Pb zircon analyses from the gneisses offshore give a relatively narrow range of Neoarchaean protolith ages (ca 2.7-2.8 Ga) spread over a geographic area of 60,000 km2 west of Shetland. Detrital zircon data from overlying Triassic-Cretaceous sedimentary sequences in the FSB suggest an equivalent limited range of Neoarchaean source materials. Hf isotopic data indicate involvement of Palaeo- to Mesoarchaean crustal sources. Overall, our findings suggest that a major phase of Neoarchaean crustal formation and associated high grade metamorphism dominates basement rocks in the region. They are similar in age and lithology to the protoliths of the nearest onshore Lewisian Complex of NW Scotland (Rhiconich Terrane). However, they lack geochronological or textural evidence for the widespread Proterozoic Laxfordian events (ca 1.7-1.8 Ga) which are widespread in Scotland. This suggests that the Precambrian rocks west of Shetland – the Faroe-Shetland Terrane - can be correlated with the Archaean rocks of the Central Greenland-Rae Craton and that a northern limit of Proterozoic reworking lies just offshore from the north coast of Scotland. |
format |
Article in Journal/Newspaper |
author |
Holdsworth, R.E. Morton, A. Frei, D. Gerdes, A. Strachan, R.A. Dempsey, E. Warren, C. Whitham, A. |
spellingShingle |
Holdsworth, R.E. Morton, A. Frei, D. Gerdes, A. Strachan, R.A. Dempsey, E. Warren, C. Whitham, A. The nature and significance of the Faroe-Shetland Terrane : linking Archaean basement blocks across the North Atlantic. |
author_facet |
Holdsworth, R.E. Morton, A. Frei, D. Gerdes, A. Strachan, R.A. Dempsey, E. Warren, C. Whitham, A. |
author_sort |
Holdsworth, R.E. |
title |
The nature and significance of the Faroe-Shetland Terrane : linking Archaean basement blocks across the North Atlantic. |
title_short |
The nature and significance of the Faroe-Shetland Terrane : linking Archaean basement blocks across the North Atlantic. |
title_full |
The nature and significance of the Faroe-Shetland Terrane : linking Archaean basement blocks across the North Atlantic. |
title_fullStr |
The nature and significance of the Faroe-Shetland Terrane : linking Archaean basement blocks across the North Atlantic. |
title_full_unstemmed |
The nature and significance of the Faroe-Shetland Terrane : linking Archaean basement blocks across the North Atlantic. |
title_sort |
nature and significance of the faroe-shetland terrane : linking archaean basement blocks across the north atlantic. |
publisher |
Elsevier |
publishDate |
2019 |
url |
http://dro.dur.ac.uk/26917/ http://dro.dur.ac.uk/26917/2/26917.pdf http://dro.dur.ac.uk/26917/1/26917.pdf https://doi.org/10.1016/j.precamres.2018.12.004 |
long_lat |
ENVELOPE(-116.053,-116.053,62.834,62.834) ENVELOPE(13.943,13.943,66.985,66.985) |
geographic |
Greenland Rae Rona |
geographic_facet |
Greenland Rae Rona |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_source |
Precambrian research, 2019, Vol.321, pp.154-171 [Peer Reviewed Journal] |
op_relation |
dro:26917 issn:0301-9268 doi:10.1016/j.precamres.2018.12.004 http://dro.dur.ac.uk/26917/ https://doi.org/10.1016/j.precamres.2018.12.004 http://dro.dur.ac.uk/26917/2/26917.pdf http://dro.dur.ac.uk/26917/1/26917.pdf |
op_rights |
© 2018 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.precamres.2018.12.004 |
container_title |
Precambrian Research |
container_volume |
321 |
container_start_page |
154 |
op_container_end_page |
171 |
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1766019984134242304 |