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dc.contributor.authorPeace, Alexander
dc.contributor.authorDempsey, Edward
dc.contributor.authorSchiffer, Christian
dc.contributor.authorWelford, J.
dc.contributor.authorMcCaffrey, Ken
dc.contributor.authorImber, Jonathan
dc.contributor.authorPhethean, Jordan
dc.date.accessioned2019-10-28T09:54:23Z
dc.date.available2019-10-28T09:54:23Z
dc.date.issued2018-08-20
dc.identifier.citationPeace, 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/geosciences8080308en_US
dc.identifier.doi10.3390/geosciences8080308
dc.identifier.urihttp://hdl.handle.net/10545/624260
dc.description.abstractThe 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.en_US
dc.description.sponsorshipN/Aen_US
dc.language.isoenen_US
dc.publisherMDPI AGen_US
dc.relation.urlhttps://www.mdpi.com/2076-3263/8/8/308en_US
dc.relation.urlhttp://dro.dur.ac.uk/25977/en_US
dc.subjectrifting; passive margin; continental breakup; stress inversion; plate tectonics; geopotential stress; numerical modelling; field geologyen_US
dc.titleEvidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical modelsen_US
dc.typeArticleen_US
dc.identifier.eissn20763263
dc.contributor.departmentDurham Universityen_US
dc.contributor.departmentMemorial University of Newfoundland, Canadaen_US
dc.contributor.departmentUniversity of Hullen_US
dc.contributor.departmentUppsala University, Swedenen_US
dc.identifier.journalGeosciencesen_US
dc.source.volume8
dc.source.issue8
dc.source.beginpage308
dcterms.dateAccepted2018-08-15
dc.author.detail786723en_US


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