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    An evaluation of Mesozoic rift-related magmatism on the margins of the Labrador Sea : implications for rifting and passive margin asymmetry.

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    Authors
    Phethean, Jordan cc
    Peace, Alexander
    McCaffrey, Ken
    Imber, Jonathan
    Nowell, Geoff
    Gerdes, Keith
    Dempsey, Edward
    Affiliation
    Durham University
    Shell International
    Issue Date
    2016-09-29
    
    Metadata
    Show full item record
    Abstract
    The Labrador Sea is a small (~900 km wide) ocean basin separating southwest Greenland from Labrador, Canada. It opened following a series of rifting events that began as arly as the Late Triassic or Jurassic, culminating in a brief period of seafloor spreading commencing by polarity chron 27 (C27; Danian) and ending by C13 (Eocene-Oligocene oundary). Rift-related magmatism has been documented on both conjugate margins of the Labrador Sea. In southwest Greenland this magmatism formed a major coast-parallel dike swarm as well as other smaller dikes and intrusions. Evidence for rift-related magmatism on the conjugate Labrador margin is limited to igneous lithologies found in deep offshore exploration wells, mostly belonging to the Alexis Formation, along with a postulated Early Cretaceous nephelinite dike swarm (ca. 142 Ma) that crops out onshore, near Makkovik, Labrador. Our field observations of this Early Cretaceous nephelinite suite lead us to conclude that the early rift-related magmatism exposed around Makkovik is volumetrically and spatially limited compared to the contemporaneous magmatism on the conjugate southwest Greenland margin. This asymmetry in the spatial extent of the exposed onshore magmatism is consistent with other observations of asymmetry between the conjugate margins of the Labrador Sea, including the total sediment thickness in offshore basins, the crustal structure, and the bathymetric profile of the shelf width. We propose that the magmatic and structural asymmetry observed between these two conjugate margins is consistent with an early rifting phase dominated by simple shear rather than pure shear deformation. In such a setting Labrador would be the lower plate margin to the southwest Greenland upper plate.
    Citation
    Peace, A., McCaffrey, K., Imber, J., Phethean, J., Nowell, G., Gerdes, K., and Dempsey, E., (2016) 'An evaluation of Mesozoic rift-related magmatism on the margins of the Labrador Sea: Implications for rifting and passive margin asymmetry'. Geosphere, 2(6), pp, 1701–1724. DOI: 10.1130 /GES01341.1.
    Publisher
    The Geological Society of America
    Journal
    Geosphere
    URI
    http://hdl.handle.net/10545/624259
    DOI
    10.1130/GES01341.1
    Additional Links
    http://dro.dur.ac.uk/19785/
    https://pubs.geoscienceworld.org/gsa/geosphere/article/12/6/1701-1724/208007
    Type
    Article
    Language
    en
    EISSN
    1553040X
    ae974a485f413a2113503eed53cd6c53
    10.1130/GES01341.1
    Scopus Count
    Collections
    Environmental Sustainability Research Centre

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