Interplay of proximal and distal sources in Devonian-carboniferous sandstones of the Clair basin, west of Shetland, revealed by detrital zircon U-Pb ages
The Clair Basin is one of the Devonian sedimentary basins formed as a result of extensional tectonics in the aftermath of the Caledonian orogeny. The Devonian to Carboniferous Clair Group was deposited directly on Archaean basement, providing an opportunity to consider contrasting proximal and dista...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Geological Society of London
2015
|
Subjects: | |
Online Access: | http://hdl.handle.net/1885/69200 |
id |
ftanucanberra:oai:digitalcollections.anu.edu.au:1885/69200 |
---|---|
record_format |
openpolar |
spelling |
ftanucanberra:oai:digitalcollections.anu.edu.au:1885/69200 2023-05-15T16:29:30+02:00 Interplay of proximal and distal sources in Devonian-carboniferous sandstones of the Clair basin, west of Shetland, revealed by detrital zircon U-Pb ages Schmidt, A.S. Morton, Andrew Nichols, G.J. Fanning, Christopher 2015-12-10T23:33:15Z http://hdl.handle.net/1885/69200 unknown Geological Society of London 0016-7649 http://hdl.handle.net/1885/69200 Journal of the Geological Society Journal article 2015 ftanucanberra 2015-12-21T23:45:18Z The Clair Basin is one of the Devonian sedimentary basins formed as a result of extensional tectonics in the aftermath of the Caledonian orogeny. The Devonian to Carboniferous Clair Group was deposited directly on Archaean basement, providing an opportunity to consider contrasting proximal and distal provenances. New secondary ion mass spectrometry detrital zircon U-Pb data and complementary heavy mineral data allow for a reinterpretation of potential source areas. Detrital zircons from the Clair Group yield ages ranging from c. 400 to 3700 Ma. All samples contain a group of Archaean ages (c. 16-82%). However, many samples also contain a major group of Proterozoic zircons (c. 15%-78%), allowing subdivision into two types of samples: type 1, dominated by Proterozoic zircons, and type 2, dominated by Archaean zircons. Type 2 samples are mainly derived from local basement gneisses during phases of tectonic rejuvenation of the hinterland, whereas type 1 samples are most probably sourced from NE Greenland or, less likely, SW Scandinavia. Upper Clair Group (Unit VII-IX) sandstones have type 2 zircon spectra in association with staurolite- and garnet-rich heavy mineral assemblages and were probably derived from predominantly Archaean-sourced metasedimentary rocks on the Shetland Platform. Article in Journal/Newspaper Greenland Australian National University: ANU Digital Collections Greenland |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
description |
The Clair Basin is one of the Devonian sedimentary basins formed as a result of extensional tectonics in the aftermath of the Caledonian orogeny. The Devonian to Carboniferous Clair Group was deposited directly on Archaean basement, providing an opportunity to consider contrasting proximal and distal provenances. New secondary ion mass spectrometry detrital zircon U-Pb data and complementary heavy mineral data allow for a reinterpretation of potential source areas. Detrital zircons from the Clair Group yield ages ranging from c. 400 to 3700 Ma. All samples contain a group of Archaean ages (c. 16-82%). However, many samples also contain a major group of Proterozoic zircons (c. 15%-78%), allowing subdivision into two types of samples: type 1, dominated by Proterozoic zircons, and type 2, dominated by Archaean zircons. Type 2 samples are mainly derived from local basement gneisses during phases of tectonic rejuvenation of the hinterland, whereas type 1 samples are most probably sourced from NE Greenland or, less likely, SW Scandinavia. Upper Clair Group (Unit VII-IX) sandstones have type 2 zircon spectra in association with staurolite- and garnet-rich heavy mineral assemblages and were probably derived from predominantly Archaean-sourced metasedimentary rocks on the Shetland Platform. |
format |
Article in Journal/Newspaper |
author |
Schmidt, A.S. Morton, Andrew Nichols, G.J. Fanning, Christopher |
spellingShingle |
Schmidt, A.S. Morton, Andrew Nichols, G.J. Fanning, Christopher Interplay of proximal and distal sources in Devonian-carboniferous sandstones of the Clair basin, west of Shetland, revealed by detrital zircon U-Pb ages |
author_facet |
Schmidt, A.S. Morton, Andrew Nichols, G.J. Fanning, Christopher |
author_sort |
Schmidt, A.S. |
title |
Interplay of proximal and distal sources in Devonian-carboniferous sandstones of the Clair basin, west of Shetland, revealed by detrital zircon U-Pb ages |
title_short |
Interplay of proximal and distal sources in Devonian-carboniferous sandstones of the Clair basin, west of Shetland, revealed by detrital zircon U-Pb ages |
title_full |
Interplay of proximal and distal sources in Devonian-carboniferous sandstones of the Clair basin, west of Shetland, revealed by detrital zircon U-Pb ages |
title_fullStr |
Interplay of proximal and distal sources in Devonian-carboniferous sandstones of the Clair basin, west of Shetland, revealed by detrital zircon U-Pb ages |
title_full_unstemmed |
Interplay of proximal and distal sources in Devonian-carboniferous sandstones of the Clair basin, west of Shetland, revealed by detrital zircon U-Pb ages |
title_sort |
interplay of proximal and distal sources in devonian-carboniferous sandstones of the clair basin, west of shetland, revealed by detrital zircon u-pb ages |
publisher |
Geological Society of London |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/69200 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Journal of the Geological Society |
op_relation |
0016-7649 http://hdl.handle.net/1885/69200 |
_version_ |
1766019200640352256 |