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The lamprophyres of Ubekendt Ejland, West Greenland: Products of renewed partial melting or extreme differentiation?

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Abstract

The late tholeiitic lavas of southwestern Ubekendt Ejland (63-54 Ma) are intruded by lamprophyre dykes (∼33 Ma). The compositional and temporal differences would seem to preclude any genetic relationship between the two igneous episodes. Competing models of renewed partial melting versus extended batch fractionation are considered to explain the origin of the lamprophyres. Mathematically modelled lamprophyres produced by batch fractionation are very close to observed lamprophyre compositions and this, combined with other temporal and spatial evidence, suggests that renewed partial melting of the mantle is not the best way to explain such bimodal suites.

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Authors and Affiliations

  1. Dept. of Geology, Dalhousie University Halifax, B3H 3J5, Nova Scotia, Canada

    D. B. Clarke & G. K. Muecke

  2. Dept. of Geology, St. Mary's University Halifax, B3H 3C3, Nova Scotia, Canada

    G. Pe-Piper

Authors
  1. D. B. Clarke
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  2. G. K. Muecke
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  3. G. Pe-Piper
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Clarke, D.B., Muecke, G.K. & Pe-Piper, G. The lamprophyres of Ubekendt Ejland, West Greenland: Products of renewed partial melting or extreme differentiation?. Contr. Mineral. and Petrol. 83, 117–127 (1983). https://doi.org/10.1007/BF00373084

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