Jurassic syn-rift sedimentation on a seawards-tilted fault block, Traill Ø, North-East Greenland
Middle–Late Jurassic rifting in East Greenland was marked by westwards tilting of wide fault blocks bounded by major N–S-trending east-dipping synthetic faults. The syn-rift successions thicken westwards towards the faults and shallow marine sandstones show mainly southwards axial transport directio...
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Geological Survey of Denmark and Greenland (GEUS)
2004
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ftjgeusbullet:oai:geusjournals.org:article/4800 2023-05-15T16:03:36+02:00 Jurassic syn-rift sedimentation on a seawards-tilted fault block, Traill Ø, North-East Greenland Vosgerau, Henrik Alsen, Peter Carr, Ian D. Therkelsen, Jens Stemmerik, Lars Surlyk, Finn 2004-11-01 application/pdf https://geusbulletin.org/index.php/geusb/article/view/4800 https://doi.org/10.34194/geusb.v5.4800 eng eng Geological Survey of Denmark and Greenland (GEUS) https://geusbulletin.org/index.php/geusb/article/view/4800/10438 https://geusbulletin.org/index.php/geusb/article/view/4800 doi:10.34194/geusb.v5.4800 GEUS Bulletin; Vol. 5 (2004): The Jurassic of North-East Greenland; 9-18 2597-2154 2597-2162 Bjørnedal Block Jurassic North-East Greenland palaeocurrents rifting Traill Ø info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article. 2004 ftjgeusbullet https://doi.org/10.34194/geusb.v5.4800 2022-03-15T17:22:15Z Middle–Late Jurassic rifting in East Greenland was marked by westwards tilting of wide fault blocks bounded by major N–S-trending east-dipping synthetic faults. The syn-rift successions thicken westwards towards the faults and shallow marine sandstones show mainly southwards axial transport directions. An exception to this general pattern is found in south-east Traill Ø, which constitutes the E-tilted Bjørnedal Block, which is bounded to the west by the westwards-dipping antithetic Vælddal Fault. The stratigraphic development of the Jurassic succession on this block shows important differences to the adjacent areas reflecting a different tectonic development. Shallow marine sand seems initially to have filled accommodation space of the immediately adjacent block to the west. This block subsequently acted as a bypass area and much of the sediment was spilled eastwards onto the hangingwall of the east-dipping Bjørnedal Block. The succession on the Bjørnedal Block shows an eastwards proximal–distal decrease in sandstone– mudstone ratio, reflecting increasing water depth and progressive under-filling of the subbasin towards the east in agreement with the dip direction of the fault block. The transverse, mainly south-eastwards palaeocurrents, the eastwards increase in water depths and decrease in sandstone–mudstone ratio on the Bjørnedal Block are at variance with the standard picture of west-tilted blocks with southwards-directed palaeocurrents and decrease in grain size. Earlier palaeogeographic reconstructions have to be modified to account for the east-dipping hangingwall and different stratigraphic development of the area. The sea was thus open towards the east and there is no direct indication of a barrier or shoal east of Traill Ø. Article in Journal/Newspaper East Greenland Greenland Traill ø GEUS Bulletin (Geological Survey of Denmark and Greenland) Greenland Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) Traill Ø ENVELOPE(-23.167,-23.167,72.533,72.533) Vælddal ENVELOPE(-23.033,-23.033,72.317,72.317) Geological Survey of Denmark and Greenland (GEUS) Bulletin 5 9 18 |
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GEUS Bulletin (Geological Survey of Denmark and Greenland) |
op_collection_id |
ftjgeusbullet |
language |
English |
topic |
Bjørnedal Block Jurassic North-East Greenland palaeocurrents rifting Traill Ø |
spellingShingle |
Bjørnedal Block Jurassic North-East Greenland palaeocurrents rifting Traill Ø Vosgerau, Henrik Alsen, Peter Carr, Ian D. Therkelsen, Jens Stemmerik, Lars Surlyk, Finn Jurassic syn-rift sedimentation on a seawards-tilted fault block, Traill Ø, North-East Greenland |
topic_facet |
Bjørnedal Block Jurassic North-East Greenland palaeocurrents rifting Traill Ø |
description |
Middle–Late Jurassic rifting in East Greenland was marked by westwards tilting of wide fault blocks bounded by major N–S-trending east-dipping synthetic faults. The syn-rift successions thicken westwards towards the faults and shallow marine sandstones show mainly southwards axial transport directions. An exception to this general pattern is found in south-east Traill Ø, which constitutes the E-tilted Bjørnedal Block, which is bounded to the west by the westwards-dipping antithetic Vælddal Fault. The stratigraphic development of the Jurassic succession on this block shows important differences to the adjacent areas reflecting a different tectonic development. Shallow marine sand seems initially to have filled accommodation space of the immediately adjacent block to the west. This block subsequently acted as a bypass area and much of the sediment was spilled eastwards onto the hangingwall of the east-dipping Bjørnedal Block. The succession on the Bjørnedal Block shows an eastwards proximal–distal decrease in sandstone– mudstone ratio, reflecting increasing water depth and progressive under-filling of the subbasin towards the east in agreement with the dip direction of the fault block. The transverse, mainly south-eastwards palaeocurrents, the eastwards increase in water depths and decrease in sandstone–mudstone ratio on the Bjørnedal Block are at variance with the standard picture of west-tilted blocks with southwards-directed palaeocurrents and decrease in grain size. Earlier palaeogeographic reconstructions have to be modified to account for the east-dipping hangingwall and different stratigraphic development of the area. The sea was thus open towards the east and there is no direct indication of a barrier or shoal east of Traill Ø. |
format |
Article in Journal/Newspaper |
author |
Vosgerau, Henrik Alsen, Peter Carr, Ian D. Therkelsen, Jens Stemmerik, Lars Surlyk, Finn |
author_facet |
Vosgerau, Henrik Alsen, Peter Carr, Ian D. Therkelsen, Jens Stemmerik, Lars Surlyk, Finn |
author_sort |
Vosgerau, Henrik |
title |
Jurassic syn-rift sedimentation on a seawards-tilted fault block, Traill Ø, North-East Greenland |
title_short |
Jurassic syn-rift sedimentation on a seawards-tilted fault block, Traill Ø, North-East Greenland |
title_full |
Jurassic syn-rift sedimentation on a seawards-tilted fault block, Traill Ø, North-East Greenland |
title_fullStr |
Jurassic syn-rift sedimentation on a seawards-tilted fault block, Traill Ø, North-East Greenland |
title_full_unstemmed |
Jurassic syn-rift sedimentation on a seawards-tilted fault block, Traill Ø, North-East Greenland |
title_sort |
jurassic syn-rift sedimentation on a seawards-tilted fault block, traill ø, north-east greenland |
publisher |
Geological Survey of Denmark and Greenland (GEUS) |
publishDate |
2004 |
url |
https://geusbulletin.org/index.php/geusb/article/view/4800 https://doi.org/10.34194/geusb.v5.4800 |
long_lat |
ENVELOPE(-54.065,-54.065,49.700,49.700) ENVELOPE(-23.167,-23.167,72.533,72.533) ENVELOPE(-23.033,-23.033,72.317,72.317) |
geographic |
Greenland Tilting Traill Ø Vælddal |
geographic_facet |
Greenland Tilting Traill Ø Vælddal |
genre |
East Greenland Greenland Traill ø |
genre_facet |
East Greenland Greenland Traill ø |
op_source |
GEUS Bulletin; Vol. 5 (2004): The Jurassic of North-East Greenland; 9-18 2597-2154 2597-2162 |
op_relation |
https://geusbulletin.org/index.php/geusb/article/view/4800/10438 https://geusbulletin.org/index.php/geusb/article/view/4800 doi:10.34194/geusb.v5.4800 |
op_doi |
https://doi.org/10.34194/geusb.v5.4800 |
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Geological Survey of Denmark and Greenland (GEUS) Bulletin |
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