Comment on ‘Magnetic studies of magma-supply and sea-floor metamorphism: Troodos ophiolite dikes’, by G.J. Borradaile and D. Gauthier |
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Authors: | Jean-Paul Callot Laurent Geoffroy Charles Aubourg |
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Institution: | aIFP, 1-4 avenue de Bois Préau, 92852 Rueil Malmaison cedex, France;bUniversité du Maine, Av. O. Messiaen, Le Mans 72085 cedex, France;cUniversité de Cergy-Pontoise, Mail Gay-Lussac Cergy-Pontoise 95031 cedex, France |
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Abstract: | Anisotropy of magnetic susceptibility is used as a proxy for the determination of magmatic flow direction in mafic dykes. Here we take advantage of the dataset from G.J. Borradaile and D. Gauthier to comment three points: (1) the sampling strategy; (2) the geometric relationship between magnetic axis dyke, and, (3) an alternative interpretation to obtain a flow direction. The magnetic lineations published by Borradaile and Gauthier correspond to the zone axis of the dyke and magnetic foliation poles, questioning the reliability of the magnetic lineation as a flow estimate. An alternative interpretation is based on the use of the tiling of the magnetic foliation plane against the dyke wall. |
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