Ambiguity in gravity interpretation and the deep structure of the Jörn-Bastuträsk area of the Skellefte field in Northern Sweden

Abstract

We show by means of an example that even when gravity data are combined with relevant near-surface geological data profound ambiguities remain about structures deeper than, say, 2002-300 m. Four widely different models of the Jörn-Bastuträsk area in northern Sweden, all compatible with surface geological data to the same extent, fit the observed gravity field equally well. Near-surface geological data are not a sufficiently strong constraint on gravity interpretation. On the other hand, a geological model must be always rejected if it does not fit the observed data, such as the gravity field.