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    Constraints on the evolution of the East Greenland Margin: evidence from detrital apatite in offshore sediments

    Clift, P.D. and Carter, Andrew and Hurford, A.J. (1996) Constraints on the evolution of the East Greenland Margin: evidence from detrital apatite in offshore sediments. Geology 24 (11), pp. 1013-1016. ISSN 0091-7613.

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    Abstract

    We test a new approach to understanding the tectonic evolution of passive margins by using fission-track analysis on detrital apatites from sediments deposited offshore East Greenland. These apatites have not undergone postdepositional track annealing and therefore reflect provenance. The apatites preserve a component of the source rocks' thermal history that otherwise may not be retained within the present-day outcrop. Fission-track–derived denudational histories from samples at Ocean Drilling Program drill sites offshore East Greenland at lat 63°N are compared with data from the onshore Singertat Complex. Previous apatite fission-track studies and geomorphic mapping of the East Greenland coast have shown that locally up to 6 km of denudation may have occurred, implying significant tectonic or magmatic activity starting as much as 30 m.y. after breakup at 56 Ma. In contrast, apatite fission-track data presented here record <2 km of Cenozoic denudation in southeast Greenland, probably driven by magmatic underplating at the time of breakup. Large-magnitude, postrift denudation of East Greenland is restricted to the area around Kangerdlugssuaq (68°N). The timing (<40–50 Ma) and magnitude are in accord with revised plume track models suggesting that the Iceland plume crossed the margin here during the late Eocene.

    Metadata

    Item Type: Article
    School: School of Science > Earth and Planetary Sciences
    Depositing User: Sarah Hall
    Date Deposited: 06 Aug 2019 09:18
    Last Modified: 06 Aug 2019 09:18
    URI: https://eprints.bbk.ac.uk/id/eprint/28458

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