Evidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical models
The onshore exposures adjacent to modern, offshore passive continental margins may preserve evidence of deformation from the pre-, syn-, and post-rift phases of continental breakup that allow us to investigate the processes associated with and controlling rifting and breakup. Here, we characterize o...
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Online Access: | http://hdl.handle.net/10545/624260 https://doi.org/10.3390/geosciences8080308 |
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ftunivderby:oai:derby.openrepository.com:10545/624260 2023-05-15T16:30:19+02:00 Evidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical models Peace, Alexander Dempsey, Edward Schiffer, Christian Welford, J. McCaffrey, Ken Imber, Jonathan Phethean, Jordan Durham University Memorial University of Newfoundland, Canada University of Hull Uppsala University, Sweden 2018-08-20 http://hdl.handle.net/10545/624260 https://doi.org/10.3390/geosciences8080308 en eng MDPI AG https://www.mdpi.com/2076-3263/8/8/308 http://dro.dur.ac.uk/25977/ Peace, A., Dempsey, E., Schiffer, C., Welford, J., McCaffrey, K., Imber, J. and Phethean, J., (2018). 'Evidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical models'. Geosciences, 8(8), pp, .DOI :10.3390/geosciences8080308 doi:10.3390/geosciences8080308 http://hdl.handle.net/10545/624260 20763263 Geosciences 8 308 rifting passive margin continental breakup stress inversion plate tectonics geopotential stress numerical modelling field geology Article 2018 ftunivderby https://doi.org/10.3390/geosciences8080308 2020-09-04T06:43:51Z The onshore exposures adjacent to modern, offshore passive continental margins may preserve evidence of deformation from the pre-, syn-, and post-rift phases of continental breakup that allow us to investigate the processes associated with and controlling rifting and breakup. Here, we characterize onshore brittle deformation and pre-rift basement metamorphic mineral fabric from onshore Labrador in Eastern Canada in the Palaeoproterozoic Aillik Domain of the Makkovik Province. Stress inversion (1) was applied to these data and then compared to (2) numerical models of hybrid slip and dilation tendency, (3) independent calculations of the regional geopotential stress field, and (4) analyses of palaeo-stress in proximal regions from previous work. The stress inversion shows well-constrained extensional deformation perpendicular to the passive margin, likely related to pre-breakup rifting in the proto-Labrador Sea. Hybrid slip and dilatation analysis indicates that inherited basement structures were likely oriented in a favorable orientation to be reactivated during rifting. Reconstructed geopotential stresses illuminate changes of the ambient stress field over time and confirm the present paleo-stress estimates. The new results and numerical models provide a consistent picture of the late Mesozoic-Cenozoic lithospheric stress field evolution in the Labrador Sea region. The proto-Labrador Sea region was characterized by a persistent E–W (coast-perpendicular) extensional stress regime, which we interpret as the pre-breakup continental rifting that finally led to continental breakup. Later, the ridge push of the Labrador Sea spreading ridge maintained this general direction of extension. We see indications for anti-clockwise rotation of the direction of extension along some of the passive margins. However, extreme persistent N–S-oriented extension as indicated by studies further north in West Greenland cannot be confirmed. N/A Article in Journal/Newspaper Greenland Labrador Sea Makkovik UDORA - The University of Derby Online Research Archive Canada Greenland Makkovik ENVELOPE(-59.178,-59.178,55.087,55.087) Geosciences 8 8 308 |
institution |
Open Polar |
collection |
UDORA - The University of Derby Online Research Archive |
op_collection_id |
ftunivderby |
language |
English |
topic |
rifting passive margin continental breakup stress inversion plate tectonics geopotential stress numerical modelling field geology |
spellingShingle |
rifting passive margin continental breakup stress inversion plate tectonics geopotential stress numerical modelling field geology Peace, Alexander Dempsey, Edward Schiffer, Christian Welford, J. McCaffrey, Ken Imber, Jonathan Phethean, Jordan Evidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical models |
topic_facet |
rifting passive margin continental breakup stress inversion plate tectonics geopotential stress numerical modelling field geology |
description |
The onshore exposures adjacent to modern, offshore passive continental margins may preserve evidence of deformation from the pre-, syn-, and post-rift phases of continental breakup that allow us to investigate the processes associated with and controlling rifting and breakup. Here, we characterize onshore brittle deformation and pre-rift basement metamorphic mineral fabric from onshore Labrador in Eastern Canada in the Palaeoproterozoic Aillik Domain of the Makkovik Province. Stress inversion (1) was applied to these data and then compared to (2) numerical models of hybrid slip and dilation tendency, (3) independent calculations of the regional geopotential stress field, and (4) analyses of palaeo-stress in proximal regions from previous work. The stress inversion shows well-constrained extensional deformation perpendicular to the passive margin, likely related to pre-breakup rifting in the proto-Labrador Sea. Hybrid slip and dilatation analysis indicates that inherited basement structures were likely oriented in a favorable orientation to be reactivated during rifting. Reconstructed geopotential stresses illuminate changes of the ambient stress field over time and confirm the present paleo-stress estimates. The new results and numerical models provide a consistent picture of the late Mesozoic-Cenozoic lithospheric stress field evolution in the Labrador Sea region. The proto-Labrador Sea region was characterized by a persistent E–W (coast-perpendicular) extensional stress regime, which we interpret as the pre-breakup continental rifting that finally led to continental breakup. Later, the ridge push of the Labrador Sea spreading ridge maintained this general direction of extension. We see indications for anti-clockwise rotation of the direction of extension along some of the passive margins. However, extreme persistent N–S-oriented extension as indicated by studies further north in West Greenland cannot be confirmed. N/A |
author2 |
Durham University Memorial University of Newfoundland, Canada University of Hull Uppsala University, Sweden |
format |
Article in Journal/Newspaper |
author |
Peace, Alexander Dempsey, Edward Schiffer, Christian Welford, J. McCaffrey, Ken Imber, Jonathan Phethean, Jordan |
author_facet |
Peace, Alexander Dempsey, Edward Schiffer, Christian Welford, J. McCaffrey, Ken Imber, Jonathan Phethean, Jordan |
author_sort |
Peace, Alexander |
title |
Evidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical models |
title_short |
Evidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical models |
title_full |
Evidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical models |
title_fullStr |
Evidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical models |
title_full_unstemmed |
Evidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical models |
title_sort |
evidence for basement reactivation during the opening of the labrador sea from the makkovik province, labrador, canada: insights from field data and numerical models |
publisher |
MDPI AG |
publishDate |
2018 |
url |
http://hdl.handle.net/10545/624260 https://doi.org/10.3390/geosciences8080308 |
long_lat |
ENVELOPE(-59.178,-59.178,55.087,55.087) |
geographic |
Canada Greenland Makkovik |
geographic_facet |
Canada Greenland Makkovik |
genre |
Greenland Labrador Sea Makkovik |
genre_facet |
Greenland Labrador Sea Makkovik |
op_source |
8 308 |
op_relation |
https://www.mdpi.com/2076-3263/8/8/308 http://dro.dur.ac.uk/25977/ Peace, A., Dempsey, E., Schiffer, C., Welford, J., McCaffrey, K., Imber, J. and Phethean, J., (2018). 'Evidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical models'. Geosciences, 8(8), pp, .DOI :10.3390/geosciences8080308 doi:10.3390/geosciences8080308 http://hdl.handle.net/10545/624260 20763263 Geosciences |
op_doi |
https://doi.org/10.3390/geosciences8080308 |
container_title |
Geosciences |
container_volume |
8 |
container_issue |
8 |
container_start_page |
308 |
_version_ |
1766020032553287680 |