Three-dimensional extension of the Hill End Trough based on the modelling of the regional gravity data

Abstract

Computer modelling was used to establish basement architecture of an inverted sedimentary basin using regional gravity and interpreted geology. The gravity data reflect the response of the Ordovician volcanic basement of the Hill End Trough. The three-dimensional model of basin opening indicates ``chocolate-tablet' type extension in response to opening of the trough along a small circle about a pole of rotation to the northwest. There is a strong correlation between the basement architecture and plunge changes in surface folds and also with mineral deposits in the Silurian-Early Devonian fill of the Hill End Trough.