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    Evidence for basement reactivation during the opening of the Labrador sea from the Makkovik province, Labrador, Canada: insights from field data and numerical models

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    Authors
    Peace, Alexander
    Dempsey, Edward
    Schiffer, Christian
    Welford, J.
    McCaffrey, Ken
    Imber, Jonathan
    Phethean, Jordan cc
    Affiliation
    Durham University
    Memorial University of Newfoundland, Canada
    University of Hull
    Uppsala University, Sweden
    Issue Date
    2018-08-20
    
    Metadata
    Show full item record
    Abstract
    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.
    Citation
    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
    Publisher
    MDPI AG
    Journal
    Geosciences
    URI
    http://hdl.handle.net/10545/624260
    DOI
    10.3390/geosciences8080308
    Additional Links
    https://www.mdpi.com/2076-3263/8/8/308
    http://dro.dur.ac.uk/25977/
    Type
    Article
    Language
    en
    EISSN
    20763263
    ae974a485f413a2113503eed53cd6c53
    10.3390/geosciences8080308
    Scopus Count
    Collections
    Environmental Sustainability Research Centre

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