Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affinities in the peri-Gondwanan Caledonides
The Caledonides of Britain and Ireland include terranes attributed to both Laurentian and Gondwanan sources, separated along the Solway line. Gondwanan elements to the south have been variably assigned to the domains Ganderia and East Avalonia. The Midland Platform forms the core of East Avalonia bu...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/525117/ https://doi.org/10.1017/S0016756818000407 |
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ftnerc:oai:nora.nerc.ac.uk:525117 2023-05-15T17:21:50+02:00 Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affinities in the peri-Gondwanan Caledonides Waldron, John W.F. Schofield, David I. Pearson, Graham Sarkar, Chiranjeeb Luo, Yan Dokken, Robert 2019-07-16 http://nora.nerc.ac.uk/id/eprint/525117/ https://doi.org/10.1017/S0016756818000407 unknown Cambridge University Press Waldron, John W.F.; Schofield, David I.; Pearson, Graham; Sarkar, Chiranjeeb; Luo, Yan; Dokken, Robert. 2019 Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affinities in the peri-Gondwanan Caledonides. Geological Magazine, 156 (7). 1217-1232. https://doi.org/10.1017/S0016756818000407 <https://doi.org/10.1017/S0016756818000407> Publication - Article PeerReviewed 2019 ftnerc https://doi.org/10.1017/S0016756818000407 2023-02-04T19:49:15Z The Caledonides of Britain and Ireland include terranes attributed to both Laurentian and Gondwanan sources, separated along the Solway line. Gondwanan elements to the south have been variably assigned to the domains Ganderia and East Avalonia. The Midland Platform forms the core of East Avalonia but its provenance is poorly known. Laser ablation split-stream analysis yields information about detrital zircon provenance by providing simultaneous U–Pb and Lu–Hf data from the same ablated volume. A sample of Red Callavia Sandstone from uppermost Cambrian Stage 3 of the Midland Platform yields a U–Pb age spectrum dominated by Neoproterozoic and Palaeoproterozoic sources, resembling those in the Welsh Basin, the Meguma Terrane of Nova Scotia and NW Africa. Initial εHf values suggest that the Neoproterozoic zircon component was derived mainly from crustal sources < 2 Ga, and imply that the more evolved Palaeoproterozoic grains were transported into the basin from an older source terrane, probably the Eburnean Orogen of West Africa. A sample from Cambrian Stage 4 in the Bray Group of the Leinster–Lakesman Terrane shows, in contrast, a distribution of both U–Pb ages and εHf values closely similar to those of the Gander Terrane in Newfoundland and other terranes attributed to Ganderia, interpreted to be derived from the margin of Amazonia. East Avalonia is clearly distinct from Ganderia, but shows evidence for older crustal components not present in West Avalonia of Newfoundland. These three components of the Appalachian–Caledonide Orogen came from distinct sources on the margin of Cambrian Gondwana. Article in Journal/Newspaper Newfoundland Natural Environment Research Council: NERC Open Research Archive Bray ENVELOPE(-114.067,-114.067,-74.833,-74.833) Midland ENVELOPE(8.224,8.224,63.072,63.072) Geological Magazine 156 07 1217 1232 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
unknown |
description |
The Caledonides of Britain and Ireland include terranes attributed to both Laurentian and Gondwanan sources, separated along the Solway line. Gondwanan elements to the south have been variably assigned to the domains Ganderia and East Avalonia. The Midland Platform forms the core of East Avalonia but its provenance is poorly known. Laser ablation split-stream analysis yields information about detrital zircon provenance by providing simultaneous U–Pb and Lu–Hf data from the same ablated volume. A sample of Red Callavia Sandstone from uppermost Cambrian Stage 3 of the Midland Platform yields a U–Pb age spectrum dominated by Neoproterozoic and Palaeoproterozoic sources, resembling those in the Welsh Basin, the Meguma Terrane of Nova Scotia and NW Africa. Initial εHf values suggest that the Neoproterozoic zircon component was derived mainly from crustal sources < 2 Ga, and imply that the more evolved Palaeoproterozoic grains were transported into the basin from an older source terrane, probably the Eburnean Orogen of West Africa. A sample from Cambrian Stage 4 in the Bray Group of the Leinster–Lakesman Terrane shows, in contrast, a distribution of both U–Pb ages and εHf values closely similar to those of the Gander Terrane in Newfoundland and other terranes attributed to Ganderia, interpreted to be derived from the margin of Amazonia. East Avalonia is clearly distinct from Ganderia, but shows evidence for older crustal components not present in West Avalonia of Newfoundland. These three components of the Appalachian–Caledonide Orogen came from distinct sources on the margin of Cambrian Gondwana. |
format |
Article in Journal/Newspaper |
author |
Waldron, John W.F. Schofield, David I. Pearson, Graham Sarkar, Chiranjeeb Luo, Yan Dokken, Robert |
spellingShingle |
Waldron, John W.F. Schofield, David I. Pearson, Graham Sarkar, Chiranjeeb Luo, Yan Dokken, Robert Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affinities in the peri-Gondwanan Caledonides |
author_facet |
Waldron, John W.F. Schofield, David I. Pearson, Graham Sarkar, Chiranjeeb Luo, Yan Dokken, Robert |
author_sort |
Waldron, John W.F. |
title |
Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affinities in the peri-Gondwanan Caledonides |
title_short |
Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affinities in the peri-Gondwanan Caledonides |
title_full |
Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affinities in the peri-Gondwanan Caledonides |
title_fullStr |
Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affinities in the peri-Gondwanan Caledonides |
title_full_unstemmed |
Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affinities in the peri-Gondwanan Caledonides |
title_sort |
detrital zircon characterization of early cambrian sandstones from east avalonia and se ireland: implications for terrane affinities in the peri-gondwanan caledonides |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
http://nora.nerc.ac.uk/id/eprint/525117/ https://doi.org/10.1017/S0016756818000407 |
long_lat |
ENVELOPE(-114.067,-114.067,-74.833,-74.833) ENVELOPE(8.224,8.224,63.072,63.072) |
geographic |
Bray Midland |
geographic_facet |
Bray Midland |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
Waldron, John W.F.; Schofield, David I.; Pearson, Graham; Sarkar, Chiranjeeb; Luo, Yan; Dokken, Robert. 2019 Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affinities in the peri-Gondwanan Caledonides. Geological Magazine, 156 (7). 1217-1232. https://doi.org/10.1017/S0016756818000407 <https://doi.org/10.1017/S0016756818000407> |
op_doi |
https://doi.org/10.1017/S0016756818000407 |
container_title |
Geological Magazine |
container_volume |
156 |
container_issue |
07 |
container_start_page |
1217 |
op_container_end_page |
1232 |
_version_ |
1766107674051608576 |