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Emplacement features of lamprophyre and carbonatitic lamprophyre dykes at Aillik Bay, Labrador

Published online by Cambridge University Press:  01 May 2009

S. F. Foley
S. F. Foley
Affiliation:
Abt. Kosmochemie, Max-Planck-Institut für Chemie, Saarstraße 23, 6500 Mainz, F.R.G.
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Abstract

Alkaline and ultramafic lamprophyre dykes at Aillik Bay on the coast of central Labrador exhibit features indicative of volatile-rich conditions at the time of emplacement. Aillikites (ultramafic lamprophyres) are flanked by closely spaced fracture systems whose formation was promoted by a carbonate-rich fluid moving ahead of the intruding magma. Sannaites (alkaline lamprophyres) frequently have horned termination structures which are interpreted to be partial reconnections between dyke segments which had separated at an earlier stage of intrusion.

The lamprophyre dykes comprise three sets which are interpreted as cone sheets and radial dykes related to an intrusive centre located beneath the Labrador Sea to the northeast of the coastal exposures. This complex is one of several on the margins of the Labrador Sea, and its position may be influenced by the Archean/Aphebian boundary and by a major oceanic structural feature represented by offsets in seafloor magnetic anomalies.

Type
Articles
Information
Geological Magazine , Volume 126 , Issue 1 , January 1989 , pp. 29 - 42
Copyright
Copyright © Cambridge University Press 1989

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