Abstract

J. A. Chalmers, R. C. Whittaker, N. Skaarup & T. C. R. Pulvertaft write: Geoffroy et al. 1998 have published an account of field measurements of the structure of the Palaeogene lavas exposed in western Disko, central West Greenland. They show that the lavas generally dip westwards and that the dips increase from low values immediately west of the Disko gneiss ridge to over 30° on parts of the west coast. These dipping lavas are cut by a set of faults that strike N-S and NW-SE and generally have downthrow to the east or ENE. The tectonic analysis suggests that tilting of the lavas was syn-magmatic. The field work and structural analysis described by Geoffroy et al. 1998 appears to us to be a good and competent piece of work, on which they are to be congratulated. However, in their discussion section, they develop a model based on their work which makes a forecast about the structure offshore that is contradicted by published data to which Geoffroy et al. refer, but choose to ignore.

Geoffroy et al. 1998 point out that the pattern of dips and faults within the lavas along the west coast of Disko is similar to the pattern of dips and faults described from the onshore part of the East Greenland flexure by Nielsen & Brooks (1981) and Larsen et al. 1995, and they refer also to Fitton et al. 1995 who trace the geochemical signature of the continent-ocean transition in the seaward-dipping reflectors close to the

First Page Preview

First page PDF preview
You do not currently have access to this article.